[amsat-bb] Re: AO51 mode: 23cm SSB up / 70cm FM down ?
hamoen at iae.nl
Tue Sep 9 10:02:47 PDT 2008
Hi Greg !
You are absolutely right: the objective is to test my 23cm uplink channel.
We could experiment with reduced power, smaller antennas etc.
This is why I would request the receiver of AO51 to be in SSB receive mode.
My previous antenna was (which didnt make it through AO51):
My current antenna (that I havent tried yet via AO51 mode LU):
> Hi Henk,
> I always like to try new modes, but are you sure that your uplink isn't working? I've got an ICOM 1271A, which also
> runs 10w. It feeds a homemade 18 turn helix (http://home.wavecable.com/~ko6th/IMG_0138.JPG) after about 60' of 1/2"
> hardline and another 10' of RG-8-like stuff to get out of the house, and to run around the rotor. There can't be
> much left of the signal after all that, and I have no problem getting into AO-51 with this setup, even at low
> elevations (long distance). I heard myself this evening down below 10 degrees with it.
> Are you able to hear the downlink when others are on the bird? The hardest part for me with mode LS has been on the
> "S" side - finding the downlink and tracking it through fades and the nasty doppler shift. My downconverter is off
> by about 50khz, and the IF receiver is a bit deaf, which doesn't help either.
> But, if you can hear the downlink, perhaps it is the uplink that is at issue. What sort of cable run do you have
> between the rig and the antenna? How many elements in the quad?
> Greg KO6TH
>> Date: Tue, 9 Sep 2008 07:36:41 +0200
>> From: hamoen at iae.nl
>> To: amsat-bb at amsat.org
>> CC: pa3guo at amsat.org
>> Subject: [amsat-bb] AO51 mode: 23cm SSB up / 70cm FM down ?
>> Dear all,
>> I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my
>> emails seems to bounce)
>> Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
>> Uplink 23cm SSB (!)
>> Downlink 70cm FM (preferably 435.300)
>> With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the
>> squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
>> In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch
>> level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the
>> same time !
>> Any thoughts of anyone else before I submit this request ?
>> Henk, PA3GUO
>> (... and I have a 33 elements beam now)
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