Posts by DK2ZF

    Feb.12th between 15:32 and 19:51 some 20 qsos, 3 in CW. Lowest pwr DL4SAC with 200mW to a 40 turn helix.

    There was at 17:56 F5JWF with excessive pwr, blocking and desensing the whole transponder passband. After friendly requests to him to reduce pwr by 20 dB he decides : i go QRT now

    All other stns excellent, OE4WOG had problems with the downlink.

    Here FT-847 fully DUPLEX with 145 to 2400 and RX Kuhne LNB to 1123 MHz divider port 1 to SDR port 2 to a converter for 430 MHz. Operating full duplex and in parallel watching my SDR.

    TX dish 60cm G3RUH patchfeed, RX 1.40m dish.

    Suppose that 10W at dish is quite sufficient-

    for Ascension 80cm should be ok.

    DK2ZF Feb. 13th 09:47

    Wednesday, 02:55 UTC

    passband is empty... so time for an overall view from DK2ZF.

    Here operation started at 15:32 hrd and wrkd: M0EYT, PA3FYM, PE1ITR, DK2DB, DC1NN, IK8XLD, IW1DTU, OE4WOG (downlink problems missed abt 30dB in downlink... , SP9VFD, DB6NT, F5BUU, F6BVA, G3WDG, GI7UGV, OZ1CTZ (first stn wkd in CW), DL4SCA in CW he runs 200mW!!! only into 40 turns helix, 9A2SB, DL5RDI, F5JWF was overloading and blocking the transponder, kindly requested to reduce by 20dB, F5BUU, DJ4ZC (!!), G4BAO, DF1OI, DC3ZB.

    Not too bad for the beginning! About three stations are with poor modulation, all othesr excellent. So would be no longer a topic (quality of service)

    Transponder-TX is ON,


    same level as in DEC 2018. TX is a beacon with a good idenfification, at the end at 11:04 just hallo hallo on sideband and then beacon disappeared.

    Callsign and Locator WILL NOT BE PUBLISHED... lessons learned, but a audio sequence is on my smartphone+

    Ah yes I remember the days when Leonid UA3CR first visited the AMSAT-UK colloquium and there was a lot more contact between Russian and western amateur satellite groups!

    And he also was a very nice guy...

    Yes I do remember quite well too. A man von PA0 made the translation (Chris van Berg?) and the teacher from Kettering, a lot of british humor. Still have the photos!!!

    not too much words - just a photo. With this, I was quite succesfully during L/S-mode on AO-40- made a lot of tests with DJ1KM. In perigee we wkd sometimes with just 400mW out. Adjusted by the attentuator on 144 MHz, checked with EME powermeter - see below


    SV8QG, please tell the community about your experiences via AO-40 - best woukd be about the L/S users on AO-40 especially the so called alligators.+

    Hi Charlie - and Petra

    made a lot of tests during the last days. My first setup for fixed operation (portable/travel setup under construction) I am lucky enough for a spacious housewall.. 1.4m dish vor RX and Kuhne LNB 1139 MHz IF RTLSDR. 0,60m dish with the famous G3RUH patchfeed 2m separated horizontally from RX-dish. With 20W RF absolutely no desensing - barely nothing.

    Yes I remember the first attempts in L/S-mode on AO-40. YOUR 100dB notchfilter solved the problem.