> Thanks Don for your prompt reply.
>
> I built it a few years ago and I think it worked then. I just got
> back into UHF and thought to check it out. So, I am not sure if it
> worked before.
>
> I have peaked the RX cap and LNA bias.
>
> I measured the gain across the ATF to be 10.5dB. Does that indicate
> that the PHEMT needs to be replaced?
>
> Raj, N2RD
>
> ------ Original Message ------
> From: "Don Wilhelm" <
[hidden email]>
> To: "Rajiv Dewan" <
[hidden email]>;
[hidden email]
> Sent: 5/12/2019 2:03:48 PM
> Subject: Re: [Elecraft] XV432 deaf
>
>> 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,
>>>
>
>