[amsat-bb] Re: Mode-S uplinks

Andrew Glasbrenner glasbrenner at mindspring.com
Tue Jan 11 11:42:17 PST 2011

We only run V/S and L/S, with V/S being far more common. I'd use the 435 
IF. I'd also put a preamp at the feed, and the downconverter in the 
shack where it can be easily swapped if needed.

73, Drew KO4MA
AMSAT-NA VP Operations

On 1/11/2011 2:12 PM, Edward R. Cole wrote:
> In the process of re-building my wind-damaged satellite antenna array
> and got thinking about the mode-S sats.
> I will be installing a 8dBic (RHCP) patch antenna (bought from L-Com)
> and have two different Drake downconverters to chose from depending
> on what the uplink band is.  I am guessing that AO-51 is the only
> S-band sat available, currently.  I have 435 and 123 MHz IF's for
> S-band converters depending on whether the uplink is VHF or UHF, respectively.
> So the question is whether mode-US or mode-VS is the norm on
> AO-51.  I can install both downconverters with a coax switch and run
> two IF coax lines, but it would be simpler to have only
> one.  Especially, since installation is at a current +3F temperature.
> I am installing a downsized array from what I had up:  using 2/3 of
> my 436CP42 which I call my "436CP26", a M2-2m7 yagi, and the
> patch.  I am not re-installing the 33-inch S-band dish or the 1268
> loop-yagi this winter.  The dish was probably what caused the support
> mast to bend over (65mph winds get some credit).
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
> EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter?
> DUBUS Magazine USA Rep dubususa at hotmail.com
> ======================================
> *temp not in service
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