Re: XV432 deaf
Posted by
Don Wilhelm on
May 12, 2019; 6:03pm
URL: http://elecraft.85.s1.nabble.com/XV432-deaf-tp7651572p7651573.html
Raj,
Has this XV432 worked before and recently developed weak receive? If
so, try peaking the RX input capacitor, and if that does not correct it,
replace the PHEMT (ATF34143).
If you recently acquired it, check the configuration jumpers for the 28
MHz IF - do you have a single coax and it is configured for separate TX
and RX IF (or vice-versa)?
73,
Don W3FPR
On 5/12/2019 1:44 PM, Rajiv Dewan wrote:
> Dear all,
>
>
>
> I have a XV432 that seems deaf compared to my ICOM IC-7000. When I
> tune to a local beacon on 432.300 MHz, I can copy it clearly on the IC
> but nothing is heard on the XV432/K3 with KXV3B. I checked transverter
> set up by feeding it a signal from a signal gen. It has a conversion
> gain of about 16 to 17dB. The specs say 20dB. This does seem to be too
> bad.
>
>
>
> I checked the front end RF circuit out by feeding in a -80dBm signal
> from HP8657B signal generator set to 432.300MHz. The ATF34143 seems to
> have a net gain of 11dB. The next MMIC MAV11 seems to have a gain of
> 10.5dB. Are these within spec?
>
>
>
> If I can fix it without altering the circuit, that would be ideal.
>
>
>
> Else, I am considering two mods:
>
> Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) with
> appropriate change in the bias resistor (120 1W to 270 ohms 1/4W)Insert
> a W6PQL LNA (uses PGA103+) between K10 and the ATF on board.
>
>
> Thoughts/ideas are very welcome,
>
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