[Moon-net] 2 receivers with the same antenna

[Edward Cole]

At 07:44 AM 11/17/2007, Gabriel - EA6VQ wrote:
>Hi,
>
>Might be this is a silly question, but I can't find very much information
>about this subject using Google.
>
>What is the right (lowless) way to connect two 144 MHz receivers to a single
>antenna?
>
>I want to make some tests comparing the reception of my usual receiver
>against an SDR-IQ receiver. What kind of splitter should I use?
>
>73. Gabriel - EA6VQ

Gabriel,

I tee the output of my second preamp (which is in the shack) and run 
two RG-58 lines: one to the FT-847 and the other to the 2m/28 MHz 
converter in front of my SDR-IQ.  The mismatch doesn't bother the 
sensitivity of the radios due to 31 dB gain of the two cascaded 
preamps that precede them.  My mgf-1801 (0.15 dBNF, 16.8 dBgain) 
preamp is at the tower-top and the ARR P144VDA (3SK48) (~1 dBNF, 14 
dBgain) is in the shack with 170 feet of LMR-400 between the two 
preamps.  My 2m converter is the DEMI 144/28 xvtr. with about 1 dBNF 
and 15 dBgain, followed by a 18 dB gain wide-band IF amp before the SDR-IQ.


73,
Ed - KL7UW
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  BP40IQ   50-MHz - 10-GHz   www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
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