[NLRS] How much receiver gain is the "right" amount for a transverter?

[Zack Widup]

I know this is not quantitative, but I try to have enough gain to cause an
increase in noise level without being excessive. Maybe around S3 or S4 with
an antenna hooked up.

I used the KK7B design for years. I had, I think, an 18 dB LNA in front of
it.

73, Zack W9SZ

On Fri, May 3, 2019 at 10:45 AM David Palm <thepalmhq at gmail.com> wrote:

>
>  I've been back to working on the various projects I have here and, with
> the acquisition of a Pluto SDR (awesome!) and using the spectrum analyzer
> at work, have been able to measure the receiver path gain on a couple of
> commercial transverters.
>
> As I mentioned in an earlier email, I have an old KK7B-style 1296
> transverter built by DEM that has 16.5 dB of receiver gain.  Just today I
> measured my Elecraft 222 MHz transverter's Rx gain and measured 18 dB at
> 222 and 19 dB at 223 MHz.
>
> In on-line sources I find these various references to receiver path gain:
>
> Kuhne 222 MHz transverter: "The overall gain in the receiver path was
> deliberately set to only 15 dB, as even high-performance HF transceivers
> have still large signal problems at 28 MHz."
>
> Kuhne 70/144/432 MHz transverters: 25 dB gain
>
> SSB electronics, 50 - 432 transverters: 20 dB gain
>
> SG Lab 1296 transverter:  -5 to +10 dB, adjustable
>
> Q5 Signal transverter: 20 dB
>
> So my questions are: what is the "right" amount of Rx gain in a transverter
> and why?  And what happens when you have too much?
>
> Thanks and 73,
>
> David  W9HQ
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