Last weekend I had the chance to play with my HamWAN portable setup (this is the Poynting dish, RouterBoard Metal 5SHPn, 11.1V battery, and tripod combo you see on http://hamwan.org/ homepage). I set up at the Camano Island survey location shown on the map. It's right at water level with a clear view toward Everett. When I first set up, I got a signal level of about -58 dBm. Wow! This is great for 21 miles at 5.9 GHz. As the tide went out, I saw the signal dip to around -76 dBm. This was over about 250 yards of mudflats. As the tide came back in, I saw the signal climb until the water reached the bulkhead (about 5 ft from antenna), and the signal level hit -54 dBm. The computer model predicts a path loss of 145 dB, which would put my signal level at -71 dBm. You can see from the numbers that the water improves the signal level. This was not predicted. What causes it? Kenny linked me to an interesting paper on the topic, although my observations differed from theirs: http://www.researchgate.net/publication/224138836_Slow_Frequency_Hopping_for... I find the effect of tides on signal level very intriguing. This is the sort of effect that makes 5.9 GHz microwave interesting to me. Tom KD7LXL
That's a cool observation. I would caution against equating correlation with causation though. "The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else. If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings. It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here. --Bart On 5/6/2014 9:05 AM, Tom Hayward wrote:
Last weekend I had the chance to play with my HamWAN portable setup (this is the Poynting dish, RouterBoard Metal 5SHPn, 11.1V battery, and tripod combo you see on http://hamwan.org/ homepage). I set up at the Camano Island survey location shown on the map. It's right at water level with a clear view toward Everett.
When I first set up, I got a signal level of about -58 dBm. Wow! This is great for 21 miles at 5.9 GHz. As the tide went out, I saw the signal dip to around -76 dBm. This was over about 250 yards of mudflats. As the tide came back in, I saw the signal climb until the water reached the bulkhead (about 5 ft from antenna), and the signal level hit -54 dBm.
The computer model predicts a path loss of 145 dB, which would put my signal level at -71 dBm. You can see from the numbers that the water improves the signal level. This was not predicted. What causes it?
Kenny linked me to an interesting paper on the topic, although my observations differed from theirs: http://www.researchgate.net/publication/224138836_Slow_Frequency_Hopping_for...
I find the effect of tides on signal level very intriguing. This is the sort of effect that makes 5.9 GHz microwave interesting to me.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us> wrote:
That's a cool observation. I would caution against equating correlation with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem. Tom KD7LXL
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org> on behalf of Tom Hayward <esarfl@gmail.com> Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us> wrote:
That's a cool observation. I would caution against equating correlation with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem. Tom KD7LXL _______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
It would also be interesting to see two of these test setups, some reasonable distance apart, using one as the control and doing adjustments on the other. Tom, fwiw, I have all the same gear you do. We could set mine up for this kind of thing. On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver@extencia.com> wrote:
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org> on behalf of Tom Hayward < esarfl@gmail.com> Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us> wrote:
That's a cool observation. I would caution against equating correlation
with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
-- Benjamin
Its called tidal multipath. you are getting a reflected signal that is causing cancellation or attenuation from the AP (source). take for example a sign wave and mix it with another sign wave at the same frequency but change the phase a little or a lot you will get addition or subtraction, depending on the phase. when the waves are 180 degrees* out of phase* they will cancel each other, but as you shift phase they will attenuate or add to each other. when both waves are *in phase* with each other you will have a stronger signal. I am not a very good typist or writer, so I hope this makes sense. I have in the past plotted (graphed) RSL vs tidal height for microwave links over water. Its pretty neat to see the correlation of tide versus RSL. Another great example of multipath was when TV was analog you would get ghosting. This is a great visual of multipath. As you receive a direct signal at a given point in time you are also receiving the same signal at a slightly delayed point in time. Thus a ghost image would appear due to the time delay. You also used to be able see the picture flutter due to Doppler shift mixed with multipath as an airplane would fly over at the right path. Hope this helps in understanding on what going on. 73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater On Tue, May 6, 2014 at 1:41 PM, Benjamin Krueger <ben.krueger@gmail.com>wrote:
It would also be interesting to see two of these test setups, some reasonable distance apart, using one as the control and doing adjustments on the other.
Tom, fwiw, I have all the same gear you do. We could set mine up for this kind of thing.
On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver@extencia.com> wrote:
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org> on behalf of Tom Hayward < esarfl@gmail.com> Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us> wrote:
That's a cool observation. I would caution against equating
correlation with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
-- Benjamin
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
If you are ever in West Seattle, in the Junction area, look for the old microwave tower. You will see two antennas. One is horizontal and one is vertical polarized. This helps a lot over water. When I worked at the TV station we did this also with the microwave links. Very common, and it can even occur in fog. Steve On Tuesday, May 6, 2014, Matthew Lawson <kc7eqo@gmail.com> wrote:
Its called tidal multipath. you are getting a reflected signal that is causing cancellation or attenuation from the AP (source). take for example a sign wave and mix it with another sign wave at the same frequency but change the phase a little or a lot you will get addition or subtraction, depending on the phase. when the waves are 180 degrees* out of phase*they will cancel each other, but as you shift phase they will attenuate or add to each other. when both waves are *in phase* with each other you will have a stronger signal. I am not a very good typist or writer, so I hope this makes sense. I have in the past plotted (graphed) RSL vs tidal height for microwave links over water. Its pretty neat to see the correlation of tide versus RSL.
Another great example of multipath was when TV was analog you would get ghosting. This is a great visual of multipath. As you receive a direct signal at a given point in time you are also receiving the same signal at a slightly delayed point in time. Thus a ghost image would appear due to the time delay. You also used to be able see the picture flutter due to Doppler shift mixed with multipath as an airplane would fly over at the right path.
Hope this helps in understanding on what going on.
73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater
On Tue, May 6, 2014 at 1:41 PM, Benjamin Krueger <ben.krueger@gmail.com<javascript:_e(%7B%7D,'cvml','ben.krueger@gmail.com');>
wrote:
It would also be interesting to see two of these test setups, some reasonable distance apart, using one as the control and doing adjustments on the other.
Tom, fwiw, I have all the same gear you do. We could set mine up for this kind of thing.
On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver@extencia.com<javascript:_e(%7B%7D,'cvml','mculver@extencia.com');>
wrote:
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org<javascript:_e(%7B%7D,'cvml','psdr-bounces@hamwan.org');>> on behalf of Tom Hayward <esarfl@gmail.com<javascript:_e(%7B%7D,'cvml','esarfl@gmail.com');>
Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us<javascript:_e(%7B%7D,'cvml','me@bartk.us');>> wrote:
That's a cool observation. I would caution against equating
correlation with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
-- Benjamin
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
Matthew, The wavelength here is 5cm. Which means the 1/2 wavelength (180 degree phase shift) is 2.5cm. I think the tide decreases the water level by far more than 2.5cm. He'd start seeing constructive interference again every 5cm. But he didn't. He saw a smooth gradual reduction the whole way through (right?). My current theory on this is that the mud that was exposed is far less reflective to 6GHz than the water itself. I originally proposed the multipath idea too, but that was when I thought I heard him say there were fast 10dB swings in signal strength, which would be consistent with small (water) waves. But he said the whole thing was very smooth, so I don't think it's multipath phase interference anymore. I actually have gear that can measure the reflectivity, absorption and transmission of 6GHz through arbitrary materials, if Tom ever feels like doing more tests on this phenomenon. --Bart On 5/6/2014 9:19 PM, Steve wrote:
If you are ever in West Seattle, in the Junction area, look for the old microwave tower. You will see two antennas. One is horizontal and one is vertical polarized. This helps a lot over water. When I worked at the TV station we did this also with the microwave links. Very common, and it can even occur in fog.
Steve
On Tuesday, May 6, 2014, Matthew Lawson <kc7eqo@gmail.com <mailto:kc7eqo@gmail.com>> wrote:
Its called tidal multipath. you are getting a reflected signal that is causing cancellation or attenuation from the AP (source). take for example a sign wave and mix it with another sign wave at the same frequency but change the phase a little or a lot you will get addition or subtraction, depending on the phase. when the waves are 180 degrees*out of phase* they will cancel each other, but as you shift phase they will attenuate or add to each other. when both waves are *in phase* with each other you will have a stronger signal. I am not a very good typist or writer, so I hope this makes sense. I have in the past plotted (graphed) RSL vs tidal height for microwave links over water. Its pretty neat to see the correlation of tide versus RSL.
Another great example of multipath was when TV was analog you would get ghosting. This is a great visual of multipath. As you receive a direct signal at a given point in time you are also receiving the same signal at a slightly delayed point in time. Thus a ghost image would appear due to the time delay. You also used to be able see the picture flutter due to Doppler shift mixed with multipath as an airplane would fly over at the right path.
Hope this helps in understanding on what going on.
73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater
On Tue, May 6, 2014 at 1:41 PM, Benjamin Krueger <ben.krueger@gmail.com <javascript:_e(%7B%7D,'cvml','ben.krueger@gmail.com');>> wrote:
It would also be interesting to see two of these test setups, some reasonable distance apart, using one as the control and doing adjustments on the other.
Tom, fwiw, I have all the same gear you do. We could set mine up for this kind of thing.
On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver@extencia.com <javascript:_e(%7B%7D,'cvml','mculver@extencia.com');>> wrote:
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org <javascript:_e(%7B%7D,'cvml','psdr-bounces@hamwan.org');>> on behalf of Tom Hayward <esarfl@gmail.com <javascript:_e(%7B%7D,'cvml','esarfl@gmail.com');>> Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us <javascript:_e(%7B%7D,'cvml','me@bartk.us');>> wrote: > > That's a cool observation. I would caution against equating correlation with causation though.
Agreed.
> "The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
> If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
> It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
-- Benjamin
_______________________________________________ PSDR mailing list PSDR@hamwan.org <javascript:_e(%7B%7D,'cvml','PSDR@hamwan.org');> http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
Good point Bart, very curious to see what's going on. I didn't pay attention if lat and long of both source and subscriber were posted. Would like to see the terrain profile. 73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater On May 6, 2014 11:08 PM, "Bart Kus" <me@bartk.us> wrote:
Matthew,
The wavelength here is 5cm. Which means the 1/2 wavelength (180 degree phase shift) is 2.5cm. I think the tide decreases the water level by far more than 2.5cm. He'd start seeing constructive interference again every 5cm. But he didn't. He saw a smooth gradual reduction the whole way through (right?).
My current theory on this is that the mud that was exposed is far less reflective to 6GHz than the water itself. I originally proposed the multipath idea too, but that was when I thought I heard him say there were fast 10dB swings in signal strength, which would be consistent with small (water) waves. But he said the whole thing was very smooth, so I don't think it's multipath phase interference anymore.
I actually have gear that can measure the reflectivity, absorption and transmission of 6GHz through arbitrary materials, if Tom ever feels like doing more tests on this phenomenon.
--Bart
On 5/6/2014 9:19 PM, Steve wrote:
If you are ever in West Seattle, in the Junction area, look for the old microwave tower. You will see two antennas. One is horizontal and one is vertical polarized. This helps a lot over water. When I worked at the TV station we did this also with the microwave links. Very common, and it can even occur in fog.
Steve
On Tuesday, May 6, 2014, Matthew Lawson <kc7eqo@gmail.com> wrote:
Its called tidal multipath. you are getting a reflected signal that is causing cancellation or attenuation from the AP (source). take for example a sign wave and mix it with another sign wave at the same frequency but change the phase a little or a lot you will get addition or subtraction, depending on the phase. when the waves are 180 degrees* out of phase* they will cancel each other, but as you shift phase they will attenuate or add to each other. when both waves are *in phase* with each other you will have a stronger signal. I am not a very good typist or writer, so I hope this makes sense. I have in the past plotted (graphed) RSL vs tidal height for microwave links over water. Its pretty neat to see the correlation of tide versus RSL.
Another great example of multipath was when TV was analog you would get ghosting. This is a great visual of multipath. As you receive a direct signal at a given point in time you are also receiving the same signal at a slightly delayed point in time. Thus a ghost image would appear due to the time delay. You also used to be able see the picture flutter due to Doppler shift mixed with multipath as an airplane would fly over at the right path.
Hope this helps in understanding on what going on.
73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater
On Tue, May 6, 2014 at 1:41 PM, Benjamin Krueger <ben.krueger@gmail.com>wrote:
It would also be interesting to see two of these test setups, some reasonable distance apart, using one as the control and doing adjustments on the other.
Tom, fwiw, I have all the same gear you do. We could set mine up for this kind of thing.
On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver@extencia.com>wrote:
So signal strength is clearly correlated to the moon :) ________________________________________ From: PSDR <psdr-bounces@hamwan.org> on behalf of Tom Hayward < esarfl@gmail.com> Sent: Tuesday, May 6, 2014 10:59 AM To: Puget Sound Data Ring Subject: Re: [HamWAN PSDR] HamWAN over tideflats
On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me@bartk.us> wrote:
That's a cool observation. I would caution against equating
correlation with causation though.
Agreed.
"The effect of tides on signal level" may indeed be an effect of temperature changes (ducting?) or something else.
Temperature didn't change much all day.
If I recall correctly, you were seeing very large (10dB?) high frequency (1s period?) signal swings.
Nope. I never saw more than 1 dB change during a 10 second period (never really watched it for longer periods than that). The signal very smoothly increased as the tide came in from the minimum to the maximum I shared earlier. As it rose, I never saw it dip again by more than 1 dB.
It'd be fun to understand that phenomenon as well as the slower one you're reporting here. Perhaps you were just being slowly moved through an interference node with the water level, and an antenna mounted +/- 2ft from your antenna's elevation might have reported the opposite power behavior? I also wonder if there is any polarization rotation happening here.
Maybe I should try the same location with a MIMO modem.
Tom KD7LXL
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
-- Benjamin
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing listPSDR@hamwan.orghttp://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
A close friend of mine (now S.key) related his experience with VHF ducting while at sea in the the warmer latitudes of the Pacific during WW2. They would lower an antenna within a few feet of the surface which enabled them to QSO with other like configured ships, up to several hundred miles. Passing this on FWIW. Cheers de Bill-w7kxb
On Wed, May 7, 2014 at 7:10 AM, Matthew Lawson <kc7eqo@gmail.com> wrote:
Good point Bart, very curious to see what's going on. I didn't pay attention if lat and long of both source and subscriber were posted. Would like to see the terrain profile.
I didn't post the coordinates here, but I referenced the location. It's the Camano Island survey point on the map on the website, connecting to the Paine site (as indicated on the map). You can extract the lat/lon from the map: https://www.hamwan.org/t/tiki-index.php Almost the whole 21-mile path is over water. Tom KD7LXL P.S. Let me know if you need help getting HamWAN out to that repeater on Blyn.
Thanks Tom. I would love to add HamWAN to Blyn. I need to work on an approach with the DNR. Seems adding any additional gear may be difficult. Would also love to relay to my home, I have LOS to the repeater. I had started talking with Bart last year, but will work and a 2 month old its been pretty busy over here, and I dropped the ball. :) Feel free to get a hold me same with Bart, would love to try to figure something out. Tom I added you to my G+ ham group, just FYI. 73 Matthew Lawson KC7EQO 442.100 Blyn Mt Repeater On Wed, May 7, 2014 at 1:27 PM, Tom Hayward <esarfl@gmail.com> wrote:
On Wed, May 7, 2014 at 7:10 AM, Matthew Lawson <kc7eqo@gmail.com> wrote:
Good point Bart, very curious to see what's going on. I didn't pay attention if lat and long of both source and subscriber were posted. Would like to see the terrain profile.
I didn't post the coordinates here, but I referenced the location. It's the Camano Island survey point on the map on the website, connecting to the Paine site (as indicated on the map). You can extract the lat/lon from the map: https://www.hamwan.org/t/tiki-index.php
Almost the whole 21-mile path is over water.
Tom KD7LXL
P.S. Let me know if you need help getting HamWAN out to that repeater on Blyn.
_______________________________________________ PSDR mailing list PSDR@hamwan.org http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org
participants (7)
-
Bart Kus -
Benjamin Krueger -
Bill Harris -
Matthew Lawson -
Mike Culver -
Steve -
Tom Hayward