[1000mp] Mark V Front-End Amp Setting.

[Bill Miner]

Randy,

I believe that the "tuned" input is all passive and is separate from the
tuned or flat pre-amps.  It does add some small amount of loss but if
you are in a high RF environment it may reduce QRM from adjacent
frequencies.

73,
Bill - K6WLM

WX5L wrote:
> 
> Hello,
> 
> I wanted to share this observation I recent made with my Mark V.
> 
> With a signal generator I injected the theorical s-9 signal level of -73
> dbm. Indeed the s meter read s-9 on all bands. I've always set my receiver
> front-end to "tuned" in menu 8-4 but as a curiosity test I switch to "flat"
> and found a slight increase in sensitivity as indicated on the s-meter of
> about 6 db. Not much really but could make the diffference under very weak
> signal situations.
> 
> I would have thought in the 'tuned" setting and having seperate tuned
> amplifiers for the low and high bands I would notice higher gain but that
> was not the case.
> 
> This slight increase would probably be unnoticable with on-air copy due to
> qsb ect but with a steady signal it was obvious.
> 
> This was not a sophisticated testing procedure and the results were contrary
> to what I thought.
> 
> 73,
> Randy
> WX5L@charter.net
> Thibodaux, Louisiana
> 
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