WSPR operations on 144 MHz

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Re: WSPR operations on 144 MHz

Postby VK3AMZ » Wed Jun 12, 2013 5:30 pm

Is that some hunk of rock or what???? :mrgreen: :D
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Re: WSPR operations on 144 MHz

Postby VK3BJM » Wed Jun 12, 2013 6:29 pm

VK2XN wrote:Beats me how we manage to hear each other at all..


Flights from Adelaide to Brisbane might do it. Voila:
VK2XN-VK4CZ AEP Path.jpg

Admittedly, this flight has deviated a bit off the normal track, due to the lumpy-bumpy weather currently in the area. You'd probably have mutual visibility around (over) Warwick.

Orrrr... There's the Brisbane to Perth flights:
VK2XN-VK4CZ AEP Path Bri-Per.jpg

Again the flight shown has deviated a fair bit to the south of the normal track (and the beam alignment) due to the current inclement weather.

As for possible international traffic? Perhaps Adrian VK4OX has an opinion?

I take it the elevation scale on your AirScout screen shot is in metres (not kilometres... :wink: )? So, about 39000 feet or so.

Looking at Wayne's horizon towards Scott reminds me of a line from "Little Britain": "Kaputar says no..."

No? :roll:

73,
Barry
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Re: WSPR operations on 144 MHz

Postby VK2XN » Wed Jun 12, 2013 7:11 pm

G'day Barry

Thanks for your observations and theories, all credible.

The "normal" BNE-ADL route follows the VK2XN-VK4CZ red line to the metre, and doing so would produce very little drift/doppler over the 2 minute WSPR tx period.
The one thing I have noticed is the minimal rise and fall of signal strength on WSPR traces from Scotts signal.

The AE SSB and CW contacts I have had with Adrian... VK4OX last many minutes but the signal continuously fluctuates and we spend 50% of the contact reviewing our reports..

VK4RTT is also variable on the AE path and quite stable at times on the direct path. The beacon is poor/fair copy most of the time here and has a similar patern of terrain to negotiate.

I am amazed I hear anything to the north at all given the take off and close proximity of Kaputar.

Cheers
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Re: WSPR operations on 144 MHz

Postby VK4CZ » Wed Jun 12, 2013 7:33 pm

Time for a portable op from the top of Kaputar :wink:
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Re: WSPR operations on 144 MHz

Postby VK2XN » Sat Jun 15, 2013 8:10 pm

Nice work Mick.

VK4NE Airscout speclab.jpg
VK4NE WSPR Airscout.jpg



Does anyone have a Theory on how I received signals like those in the pics below from Mick 2 evenings in a row?
There was no reported Tropo and the flight path has very few aircraft along it at these hours regarding possible AE.

Cheers.

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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sat Jun 15, 2013 9:00 pm

Hi Wayne,

Is Mick running true 20W?
Has he heard your signal or has it been one way?
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Re: WSPR operations on 144 MHz

Postby VK2XN » Sat Jun 15, 2013 10:46 pm

VK2KRR wrote:Hi Wayne,

Is Mick running true 20W?
Has he heard your signal or has it been one way?


Hi Leigh,
Not sure about his output I'm just going by his report @ 20w.
He only hears me on the odd occasion when I use 100w or more.

His signal was very stable tonight, around the -23dB mark give or take a dB.
A quick search with my callsign in the database parameters will give you a better idea.

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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sat Jun 15, 2013 11:37 pm

In my view, we live in the troposphere, there is always going to be Tropospheric conditions around of some form. Its ability to trap the radiation just varies (or the amount of loss varies).
Going by the terrain profile u put up, I think it should be easier for Mick to get a signal into you than what it would be for you get one to him, mostly due to the large mountain near your location. Im in a similar situation here where because im beaming into the Hill I think a lot of the TX power is attenuated by the hill, but yet I find its easier for signals to get to me from over the hill from others further east, such as VK1KW or VK2KOL.

Its easy to speculate about something we cant actually see in action.

It would be a good idea if you could monitor the path for a number of days, through some different weather systems and see what variations there are with the signals, if any. Get a bit more data.
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Re: WSPR operations on 144 MHz

Postby VK3BJM » Sun Jun 16, 2013 5:35 pm

VK2XN wrote:Does anyone have a Theory on how I received signals like those in the pics below from Mick 2 evenings in a row?


Was it at the same time in both evenings, Wayne?

And how long was the signal detectable on each occasion?

Not every commercial aircraft has ADS-B fitted, even now. (Though we must be getting close.) And there's always the military - I know some have transponders, but obviously they have some aircraft that won't have them turned on...

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Barry
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Re: WSPR operations on 144 MHz

Postby VK4CZ » Sun Jun 16, 2013 6:40 pm

Some amazing AE/Doppler impacts on John VK4MJF WSPR signal seen here...
VK4MJF 144489Hz WSPR 130616.JPG

Probably as a result of my QTH being situated under the 'uncontrolled' western entry to BNE :wink:
Last edited by VK4CZ on Wed Jun 26, 2013 7:52 am, edited 1 time in total.
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Re: WSPR operations on 144 MHz

Postby VK2XN » Sun Jun 16, 2013 7:33 pm

VK3BJM wrote:
VK2XN wrote:Does anyone have a Theory on how I received signals like those in the pics below from Mick 2 evenings in a row?


Was it at the same time in both evenings, Wayne?

And how long was the signal detectable on each occasion?

Not every commercial aircraft has ADS-B fitted, even now. (Though we must be getting close.) And there's always the military - I know some have transponders, but obviously they have some aircraft that won't have them turned on...

73,
Barry
VK3BJM


Hello Barry

The best way to find that info out is to go here http://wsprnet.org/drupal/wsprnet/spotquery


and enter this info

WSPR Query.JPG



There are only a couple of flight pathes out here in the sticks :lol:

North south to and from Sydney via Narrabri

BNE-ADL

and the occassional Perth flight.


Thanks for your interest.

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Re: WSPR operations on 144 MHz

Postby VK2KRR » Thu Jun 20, 2013 6:18 pm

Nice to see Charles ZS5QR on the 2m WSPR map monitoring for VK signals :D

ZS5QR.JPG
ZS5QR 2m WSPR
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sun Jul 21, 2013 7:57 am

Another good 2m WSPR article, this one by Andrew VK3BQ. Worth a read.

http://www.vk3bq.com/2013/07/15/idiots- ... 4mhz-wspr/
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sat Aug 10, 2013 10:40 pm

Bit of a tropo opening this evening 10.08.13. Nothing huge but the map came up OK, especially with the Gippsland stations on.

2mWSPR evening 100813.JPG
2m WSPR Evening 10.08.13
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Thu Aug 22, 2013 6:34 pm

Nice spread of stations across the east west paths today :mrgreen:

2mwspr.JPG
East West 2m WSPR
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sat Sep 14, 2013 7:39 am

Over the past few weeks it would appear that most stations on 2m WSPR down south have adopted a 10 Watt standard for monitioring the conditions :idea: I've also dropped mine down from 20W to 10W, although some stations may not hear the signal quite as well I think it will help give a better gauge on when the conditions are up or down, rather than having a larger signal at the far end all the time. Need to make them work a bit harder :wink:
Of course I'll still pop the power back up now and then to test more difficult paths such as across to VK6DZ as required. But for now I'll be cutting the output in half.
So far the results are still quite good with 10W and those who usually hear my signal still can, just at a lower level under more normal conditions. :mrgreen:
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Sun Nov 03, 2013 1:26 pm

Some long paths this morning.

vk6dz031113.JPG
2m WSPR morning 03.11.13
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Re: WSPR operations on 144 MHz

Postby VK2KRR » Thu Dec 12, 2013 3:31 am

Was surprised and excited to wake up this morning and find 3 x VK6 stations on the 2m WSPR map :!: :D
Besides Derek VK6DZ, there is Rob VK6LD near Perth, and Mal VK6MT at Katanning. Thanks guys.

vk6WSPR.JPG
VK6 on WSPR



I should add that past few days there has been a few VK4 stations having a look for sporadic E paths with the rest of Australia, and also Wayne VK2XN, on air.
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Re: WSPR operations on 144 MHz

Postby VK6DZ » Thu Dec 12, 2013 3:37 pm

This is VK6MT's WSPR signal from this morning, Couldn't decode it :?

VK6MT.JPG
VK6MT's Signal from 12.12.13
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Re: WSPR operations on 144 MHz

Postby VK4FP » Thu Dec 12, 2013 4:05 pm

Hi Derek, Your friend may need to read this ..
https://groups.google.com/forum/#!topic ... hDK071K1iM
Regards,
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