[AMRadio] HR-10 problem


Alan Beck abeck at xplornet.com
Fri Apr 14 10:35:26 EDT 2006


good ideas, thanks.

Alan


Brett gazdzinski wrote:
> Maybe the tube is out of bias, to much screen voltage, 
> or some resistor has changed value and the LO tube
> voltage is varying around?
> Maybe check things with the DMM?
>  
> Or maybe the bfo is changing, not the LO??
>
> Brett
> N2DTS 
>
>   
>> -----Original Message-----
>> From: amradio-bounces at mailman.qth.net 
>> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of 
>> abeck at xplornet.com
>> Sent: Monday, April 10, 2006 9:49 AM
>> To: AMRadio at mailman.qth.net
>> Subject: [AMRadio] HR-10 problem
>>
>> Hi,
>>
>> I am running an HR-10 RX in my shack outside and am wondering 
>> how to cure an 
>> annoying fault. Or, this may be bad design, but I don't 
>> remember this from when 
>> I was a kid.
>>
>> When i turn up the RF Gain, and end up close to full on it, I 
>> get a shift down  
>> in frequency of the CW note. So far that I have to retune the 
>> BFO to get it 
>> back.
>>
>> The RF Gain is in series with the Cathode of the first RF 
>> stage of the RX.
>>
>> perhaps a Zener diode to cure it?
>>
>> And if so, I guess I should measure the voltage someplace and 
>> clamp with a 
>> zener, but then again, I would be modifying the whole circut.
>>
>> Anyone know how to fix this?
>>
>> Best 73,
>>
>> Alan
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>
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