[Collins] Collins 62S-1 Transverter Downconversion Gain??

[Dr. Gerald N. Johnson]

Shouldn't need much gain, just enough so the 62S-1 RF stage noise sets
the NF of the system. A better check than gain is the NF of the system
done with a manual vacuum diode noise source and an AC VTVM on the IF
audio output with AVC turned off. To much gain introduces unneeded
intermod from strong signals. But since the 75S NF at 20 meters is 
probably 8 or 10 dB if the system NF is going to get down to 2 dB for 2m 
and 5 dB for 6m, its going to take maybe 15 to 20 dB gain in the 62S-1. 
There should be a detectable (not necessarily on the S-meter) noise rise 
in the IF receiver when the 62S-1 is switched into the circuit. A few dB 
is common, without checking system NF its hard to say how much there 
should be. Some VHF operators would advocate a 10 dB rise and I think in 
most cases that is way too much leading to intermod problems.

What does the 52S-1 use for RF stages in the receive side? I don't have 
a manual on it.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 9/19/2010 12:02 AM, zilassoc at la.twcbc.com wrote:
> Does anyone know the 50MHz to 14MHz conversion gain or loss of a
> properly operating 62S-1?  What about from 144MHz to 14MHz?  The
> manual doesn't state this metric. Thanks for the bandwidth, 73 Pete,
> K5PZ
>
>