Re: GT-3TP Satellite Usage
Marty Bluhm <w8aks55@...>
First off, thank you for the responses. They were greatly appreciated.
Following the book of baby steps, this is what I have configured.
Transmit Side: GT-3TP ( not configured)
Antenna: Elk log periodic
Computer: Dell i5 currently running Win7
Software: have Sdr-console v3 and gpredict both up and running for evaluation. Also Sdr-uno and hdsdr are on board.
The Elk is mounted ln a pvc section approx 5ft. tied to pole for present. As it sits, coverage is from ssw to nne in the clear. It is blocked to the east by the house.
Present plans are first try to hear something, no joy so far. Then proceed to programming the radio.
I have a diamond duplexer that I can use when I figure out how to connect it.
Likewise, I have 2 mfj 1708 t/r switches, one the SDR version and one generic version. Another research project so I don’t blow up the rsp2 which is a fun and very good radio.
So that is where I’m at. No timeframe, just enjoying. It will be nice when I start hearing things.
Thanks again , any comments/suggestions and that includes criticism. After 64 years of hamming and 79 years of life, the skin is pretty thick although it doesn’t look it. hi hi
73 and y’all have a good one, hear.
Beckley (Almost Heaven) WV
Re: GT-3TP Satellite Usage
Martytoggle quoted messageShow quoted text
My family is from Hill Top, outside of Oak Hill! Beautiful time of the year there!!
On Oct 15, 2019, at 5:23 PM, Marty Bluhm <w8aks55@...> wrote:
Marty Bluhm <w8aks55@...>
Yesterday I finished doing the K0PIR camera mount mod. Need a lock washer.
But was able just now to hear some signals off the just completed AO91 pass over WV.
I couldn’t make out any calls but at least I know it works <grin>
The setup is as follows
Elk duoband mounted on a camera tripod sitting in front of my recliner in the living room.
Receiving on a RSP2 using console 3.0— ver.
I have the GT3-TP sitting here but it’s going to be a while until I get the receiving bit down pat.
Any suggestions, hints and yes criticism is welcome.
I have to do some double checking making sure I have everything right.
Having the spectrum scope on the rsp2 is so helpful. Watching the signals pop out of the noise is cool!
Thanks for letting me share my excitement with y’all.
ISS SSTV December 14-15?
Several workable passes over Southern CA - IF there’s an SSTV event December 14-15 ... Watch for details!
WIMO xpol antennas for satellite use
I recently purchased the 2 meter and 70 cm X-Quad antennas from WIMO.
They can run horizontal or vertical, or circular with a phasing cable.
With switching, I can select any one of the three polarities from my shack.
Circular will be used for the satellites.
I am having some issues with very poor SWR on the 70 cm version.
I haven't started testing the 2 meter version.
The specs don't list the resonant frequency nor the bandwidth.
I asked WIMO about this and they didn't have any information on those specifications.
I'm hoping to be able to use the UHF from 430 MHz to 440 MHz.
Does anyone have any experience tuning these antennas?
With what results?
Rusty O, K7RMO
From Email ...
I have received several email messages and telephone calls during the Thanksgiving "break" -
many hams trying out the satellites for their first times! Really exciting, indeed!
Many "first-timer" questions are addressed in the tutorial offered on the home page and
throughout our support Web site ...
Questions like ...
>> ... How do I know when a satellite will be overhead?
Several programs and sites cited on the TRACKING page on the Web site!
>> ... The satellite isn't breaking squelch ...
From the tutorial: The one “absolute” for success is to open up your SQuelch. We
are talking about “weak signals” from hundreds of miles away - so don’t expect
the satellites to be strong enough to break squelch like your local repeater does.
Sure, it’s a little noisy - but that’s part of the process: That noise is an aid in
locating the satellites! When the frequency starts exhibiting quieting, that’s a sign
that you are capturing the satellites’ signals.
>> ... Can I do this with the stock antenna that came with my handheld radio?
Again, from the tutorial: Improve your HT’s stock antenna (most are rated at
NEGATIVE 6db - or worse!). The Smiley 270A is a good performer, and is
available in Male SMA, Female SMA, and Male BNC models. But for best success,
you need more GAIN, so using an Arrow Satellite Antenna or Elk Log Periodic is
much better. If you prefer to home-brew your antennas, go to the work-sat.com Web
site’s ANTENNAS page for construction article links: You can get in to the world of
high gain operations for as little as $15!
>> ... Is Doppler only for receiving?
The Doppler phenomenon isn't "dependent" on whether a frequency is
transmitted or received. It is "frequency-dependent." It is on the 440mHz side
of life where we should compensate for Doppler. It is the 440 side where there
could be as much as +/- 10kHz deviation in an FM satellite's frequency. So whether
that is SO-50's downlink - or AO-91 or '92's uplinks - it is the 440 frequency for which
we need to compensate. The frequency chart at work-sat.com takes this in to consideration
>> ... I saw someone using a longer whip ...
Yes - I know of many who are successfully working AO-91 and AO-92 with stock or improved
antennas on their HTs. A little more finesse is required - but it is being accomplished!
From the tutorial: If using a whip antenna, don’t hold it upright. Held in a vertical position,
your transmitted signal is hitting land-based receivers. Most of our satellites are not land-
based (grin). You need to tilt your HT’s antenna about the same amount as the satellites'
ELEVATION. Get it perpendicular to the orbit’s path! You will quickly get the hang of it -
and hear the difference. Again, you will have much better results with a modest beam or
Yagi antenna ...
>> ... [full-duplex operations] ...
From every of the 100+ presentation I have made, and from the tutorial: Ideally, we
should be working the FM voice satellites in full-duplex mode, where we can
simultaneously listen to the downlink as we are transmitting. Although this method is
preferred, it is not mandatory: Carefully monitor the downlink, and wait for a break
in the conversations to key your mic and announce yourself ...
>> ... What is my grid square?
There are Smartphone apps that will tell you your grid square. If you are home, a lookup
of your own callsign on QRZ.com has it for you. And on work-sat.com on the SHACK AIDS
page is a link to a grid square locator!
Happy holiday season to all!
ISS SSTV This Week?
Surprising, especially with a cargo mission heading its way to the ISS this week. BUT ...
Russian cosmonauts are expected to activate Slow Scan Television (SSTV) image transmissions on 145.800 MHz FM from the International Space Station on Wednesday to Friday, December 4, 5 and 6.
This is the schedule for the planned activation of the MAI-75 SSTV activity from the ISS.
Transmissions will be sent on 145.800 MHz FM in the SSTV mode PD-120. Once received, images can be posted and viewed by the public at http://www.spaceflightsoftware.com/ARISS_SSTV/index.php
ISS SSTV uses a Kenwood TM D710E transceiver which is part of the amateur radio station located in the Russian ISS Service Module.
Please note that SSTV events are dependent on other activities, schedules and crew responsibilities on the ISS and subject to change at any time. You can check for updates regarding planned operation at:
Read the MagPi article Pictures from space via ham radio
ISS SSTV info and links https://amsat-uk.org/beginners/iss-sstv/
Re: ISS SSTV This Week?
It is a Russia-centric project ...
>> ... Clint, Where will iss be during these times?