Receiving ISS on UHF from Central Italy

Is there anyone from central italy that has successfully received the ISS on UHF with a Vertical antenna?
Before it was pretty possible on VHF. I correct the doppler effect with the split function of a TS-2000 but no signal received.

Raffaello IZ0QWM

iz0qwm – Tue, 2016 – 12 – 06 16:39

Re: Receiving ISS on UHF from Central Italy

I'm in the southwest of UK and also use TS-2000 in split mode either using HRD or Orbitron for tracking and Doppler for uhf 437.550 with a mobile 2/70 mobile Omni antenna slightly tilted away from the oncoming iss. I do not use the inbuilt tnc but use UISS + Soundmodem via pc soundcard. It's not easy since the switch-over but find 16-45 deg passes assending to the southwest of my location are the best with high overhead passes the worse. I've also tried it with the Arrow-2 2/70 portable yagi antenna but not much better which works just fine on AO-85 and SO-50. Maybe the location of the uhf antenna is being effected by the sheer mass of the body structure on the iss and effecting the radiation pattern especially overhead passes and when moving away.

I'm able to work the iss at times and gating some traffic as well as my own with aprsis32 but it's not easy and not many stations on over Europe as can be seen on and i'm guessing others are getting the same problems.

There is an ARISS school contact operated by IK1SLD, located in Casale Monferrato, northern Italy Thursday December 8, 2016 at approximately 15:19 UTC, which is 16:19 CEWT.
It will be interesting with the downlink on UHF 5 watts 437.525 MHz (same radio used for packet digipeater) because SSTV transmissions from the Russian crew will be on 145.800 at the same time.

Submitted by G7HCE on Tue, 2016-12-06 18:42.

Re: Re: Receiving ISS on UHF from Central Italy

Thanks for the reply Dave,
I am curious to know which antenna is used by IK1SLD. I tried with two different antennas without success and not only I cannot hear him, but it did not even listen to me with 50 watts.

Raffaello IZ0QWM

Submitted by iz0qwm on Wed, 2016-12-07 00:37.

Re:Re: Re: Receiving ISS on UHF from Central Italy

I would guess that Ik1SLD is using fully tracked switchable high-gain X-yagis with masthead preamps which would be the norm for school contacts.
I use 20 watts into mobile Omni. Last pass here 23.9 deg I heard some packets but mostly it was deaf and didn't hear me at all hope for better on next passes.
Out of curiosity do you use the internal packet of the TS-2000.? As I've found that to be poor on the iss compared to soundmodem and uiss.

Submitted by G7HCE on Wed, 2016-12-07 11:52.

Re:Re: Re: Receiving ISS on UHF from Central Italy

No I don't use the internal TNC, it could not to be possible to use both TNC and Serial data for WispDDE.
I use an SCS Tracker, the one famous for the Robust Packet that can do also 1200 AFSK

Submitted by iz0qwm on Wed, 2016-12-07 17:20.


Hi, see my uploaded picture under Images! :)

Submitted by dm13dv1b on Fri, 2016-12-09 04:09.

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