Posts by DL1GNM

This is with the same dish as Goonhilly uses (~1.2m), lower beacon is blue 40dB - 6dB of noise floor (red) = ca, 34dB difference:

I know that I could improve ca. 1 dB of sensitivity from my WB measurements. Investigations to be done soon.

I'll try different LNBs soon. May be it will bring me some improvements.

Could be that the GPSDO (27MHz for the HD-BP2) degrades the signal quality somehow.

G0MJW: your dish size is > 1.2m I guess Mike?

Seems to be that I've some space for improvements...

A71A bcn: MER 10.7dB (8.9dB before change of the beacon)

1.2m offset dish, see here DL1GNM going to be QRV soon

Can anybody tell me the level of an external LO that I should apply (25MHz) to my triplexer?

Thank you.

MegaSat Twin LNB Diavolo; D66LOW GAIN V02B, 20150804

Uses 2x ZXNB 4202 (?),3x T1014, 1x 25 MHz X-Tal, 1x UTC SGA L8400G

OCTAGON Twin Green HQ, Model: OTLG GreenHQ, no Serial No.

T1015, SPT SP4202HN, 25 MHz X-Tal,

I've ordered two LT04H last year. Opened one and it uses a RT320M, 25 MHz X-Tal. Pictures enclosed. SN: 18-02-0 ...

Thank you so far. It's interesting, what is available. The taiyo yuden filter for example. Currently this is not available (mouser, digikey).

Small, affordable and a quite good attenuation.

Meanwhile we discussed the AMSAT up converter in combination with a 28-432 MHz transverter.

But keep on posting interesting solutions.

73 Mike

We know all that IF=28 MHz isn't a good choice. DX-Patrol gives the option but writes a filter is needed then (or you should...).

52 MHz (50...54) will be a little bit better.

I use 432MHz, but I asked for someone else who has no 2m or 70cm transmitter.

Achim, I know that kind of filter. May be from UHF Unterlage (DJ9HO et al...). But if you don't have the tools in your own workshop at home...

Thanks so far.

Thanks for moving my question to this thread that I did not find...

The Opticum is an idea, the horn has to be removed b a saw to use a 20/22mm fitting to bring it to the POTY.

It's for a friend that I cannot visit for known reason. So I give him an idea what to order that will work.

My station is fine.

Because he has a vy good HF rig I asked for a "special" bandpass as well (28MHz IF is not a good idea). But this is an other topic.

Opticum LTP04H would work by SDR-Console's beacon tracking I guess? Then this would be a good starting point.

Dish, POTY+LNB.

Transmit will be done in a second step.

73 Mike

LNB change faster than you can buy them. Mine works, but I'm frequently asked by newcomers for QO-100,"Which one I should get?" Good working models like the nice and small VENTON EXL-S or the "old" and famous Octagons are not available any more.

So, I'm asking.

What about a listing in this topic like this (but not filled with discontinued ones like my example)?

Type: VENTON EXL-S

Where to get: https://rd-digital.de/Venton-E…40mm-Feed-Single-LNB-01dB

Date of Order: 2019-07-28

Comments: single LNB, works UFB, no wobbling, easy to adopt to POTY. (This is a discontinued one. Sadly.)

73 Mike

Any ideas for an band pass filter, that is usable, if LO=2372MHz and IF=28MHz? Should be steep.

Regards, Mike

Thanks Peter! Works fine and the markers in SDR-Console were quickly adjusted to the new band plan.

The upper beacon has still the same level and my signal varies about 1dB over the transponder and has max. lower beacon level.

Regards Mike

Quote from DL9SEC

Also hier mein POTY mit ABS-Haube fertig silikoniert und montiert...

Ich denke, die Dämpfung von ABS bei 2,4 GHz ist im Rahmen und nicht all zu hoch, das 10 GHz Signal wird ja so nicht beeinträchtigt. Das Silikon ist hinter dem Hohlleiterausgang und der wird mit der (Venton) Linse abgeschlossen. Bei 10 GHz wäre ich mit ABS vorsichtiger, was aber hier keine Rolle spielt. Alternativ (ohne 3D Druck oder Fräsarbeiten) ist dann Heiners Lösung. Oder meine Vollumhausung.

Gut gemacht.

73 Mike

Quote from G0MJW

Please compare with rocket and post-results

@Mike:

POTY with POTY lens but without radom: MER 6.9dB D4

POTY with Venton Rocket Lens, but without radom: MER 8.8-9.0dB D6

POTY with Venton Rocket Lens, radom old position: MER 7.7dB D5

POTY with Venton Rocket Lens, radom new position: MER 8.7-8.9 dB D5/6

DATV-Beacon, empty WB Transponder - Habe die DATV Bake benutzt zum Vergleichen.

Result (Ergebnis): +2dB besser zu originaler Linse von Hans, PE1CKK, aber inkl. Radom. F/D ca. 0.68, Offset-Spiegel 120x129cm

Details found here (Details hier): DL1GNM-Antenne-Feed-LNB

73 Mike

Hallo, bei mir sieht das so aus:

Antenne mit Feed+Radom

Hier gepostet: dl1gnm-going-to-be-qrv-soon

DN125 PP; passt locker über POTY.

Gruß Mike

Hello Nader,

Watching the WB Transponder you'll need the capability of DVB-S2 and very low symbol rates. If it's old, it can't do DVB-S2 (and probably only down to 2000KS/s).

I decided to use a Minitiouner Pro V2 with the F6ZZP software.

Have a brief look here: https://wiki.batc.org.uk/MiniTiouner_hardware_Version_2

To watch TV you'll need drivers (where to get ?!) and a DVB application like the technisat program, progdvb or similar.

Perhaps somebody know the exact Model of your card. Then it's easier to find the right software+driver package.

May be this one:

https://www.technisat.com/en_X…n/352-515/?productID=7705

I found a german installation manual, see page 10. The photo looks similar to yours.

https://www.technisat.com/asse…a_AIRSTAR_2_TV_PCI_de.zip

A hint if you install drivers: please do clone your windows harddisk. I had some bad experience in my past during a crash of the software. i could reinstall windows many times. Since then I use an imager for my hard drive.

Best regards, Mike

Winlog32 from Colin, G0CUZ, I've a lot of QSO in this log. Sometimes I meet someone on QO-100 I've met a log time ago on KW, 2m, AO-13 ...

Today I had QSO with Zoli, HA3KZ, a bit surprised .

No one heard from Hungary so far. Do they have an allocation? YO, LZ, OM, OK, S5 are QRV.