Posts by DB8TF

Just used the free time and nice weather to test if i can reach the QRPP receiver in PY with very small equipment.

Using my old BU500 (@ 450mW) and a 4-turn helical roughly aimed to QO100 gives -13/-11dB SNR... much to strong!

Then i used a old WiFi omnidirectional antenna > -16dB …. still to strong to participate…

Next time i try with a dummyload

BTW: no problem with the TX frequency drift of the BU500 in direct sunlight

73s DB8TF

DL9DAC:

thank you

Maybe some AF filter settings are different between RX/MMSSTV.

Ok, but i can tell you that MMSSTV could not decode the PY Station.

Found the saved Picture.

Was mode SC2-120 and MMSTV (at least here) won't decode it.

73s

on7kec:

73s

Hello OMs!

As the forum search returned no hits for "RX-SSTV" i post a link to this SSTV decoder here.

It has some more SSTV modes than the "old" MMSSTV even that it uses parts of the original MMSSTV.

I encountered some PY stations a few days ago on SSTV not decodable with MMSSTV.

With RX-SSTV the Images could be received.

Link: http://users.belgacom.net/hamradio/rxsstv.htm

73s DB8TF

Quote from HB9SKA

Hallo Florian

Ah OK. I don't saw the relation between "Dirk Fischer Elektronik" and "DF Elektronik". I bought it last year in Friedrichshafen. I know of an HB9-OM who also bought his there.

Edit: An DL-OM with which I had a QSO also has one. Dirk Fischer selled 3 pieces of his up-converter in minimum.

I see, you closed your survey.

Display More

I have enabled the option to change your choice if you want.

The survey is running 7 days and then we see what the final result looks like.

73s DB8TF

Thanks Heiner

Armin made me curious about those devices and i need something similar for a project. (not QO100 related)

73s

Here is some stuff about programming of that devices:

https://docs.rs-online.com/9aa2/0900766b812b3e93.pdf

https://www.mouser.de/datashee…i5xxuc-evb-ug-1115978.pdf

Looks like those SI590s are programmed by the distributor (eg. Digikey) for your desired frequency.

Is that programming fixed or could it be changed later?

It would be nice if it is possible to use a uC to switch to different LO freqs.

73s

Quote from HB9SKA

I use this ("Other") one:

http://www.dk2fd.de/uc2400_02.pdf

But mine model has an additional heat sink at the bottom side. It's a newer model I think.

HB9SKA: This upconverter is in the list > "DF Elektronik"

73s

Hello,

please take part in this survey:

73s DB8TF

DL1GNM:

see here > 13cm Filter 2,3 bis 2,4 GHz Abgleich WB - Transponder

Unfortunately the link is down but i can help, just send a PN.

73s DB8TF

@IK1HGI:

Just modify the config.ini

73s

again…

Just observed a strange behaviour from Leila.

Leila activated at a strong carrier and "wanders" down in frequency even the carrier stays at the same freq.

After the carrier was gone Leila is still transmitting and wanders even lower in frequency.

73s DB8TF

PY2SDR

Maybe it would be better to look for FT-8 packets not with "CQ" but some other text, eg. "RB" or so.

There are OMs who answer to those CQ calls and are getting no answer..

73s DB8TF

Hi Enrico

You beat me by 1dB.... REVENGE! HI

73s

Again QRM on 730

..and gone 12 UTC....

@DJ0MY:

you can use the LDCP-Worker values to determine if your RX gets better.

If you tune to the Beacon you can see the values decrease with better reception.

Of course this values change also with the usage on the WBTP and the BW and your CPU Speed.

I optimised my RX system with help of that values (only beacon on the WBTP active!)

See attached picture.

73s DB8TF