[R-390] 7 Meg low sensitivity

[Bob Camp]

Hi

Single band down, everything peaking ....

I would sure start poking at switch contacts.

Bob

On Jul 28, 2007, at 4:41 PM, Keith Densmore wrote:

> Group,
> If anyone would like to give their radio a 'quick' 7 meg  
> sensitivity check, measure your calibration oscillator output on  
> the db meter at  7 000 and then at 6 +000
> Mine reads about 10 db lower on the 7 meg band
> You can also check at 7+000 and then 8 000. I get about the same  
> loss at 7 +
> Like Leigh, I don't find it to be a huge issue, but if I could fix  
> it, I would.
> I'd also be curious if anyone else finds the same problem.
> 73,
> Keith
>
>
> ----- Original Message ----- From: "Leigh Sedgwick" <bipi at comcast.net>
> To: "Keith Densmore" <densmore at idirect.com>; <r-390 at mailman.qth.net>
> Sent: Saturday, July 28, 2007 11:52 AM
> Subject: Re: [R-390] 7 Meg low sensitivity
>
>
>> Hi Keith,
>>
>> Yes, I have restored a R-390A (including RF deck) with all modules  
>> manufactured by Amelco (with the exceptions of the PTO).  I have  
>> the same problem here, i.e., lower sensitivity on 7 mc only.  I  
>> have gone through a complete alignment 4 or 5 times and cannot  
>> improve performance.  I contacted Chuck Rippel for advice and he  
>> told me that some R-390A's exhibit this property and he has not  
>> heard of a work-around or definitive explanation for it.  Not too  
>> big a deal for me but it there were a way to improve it, I would.
>>
>> Happy Trails
>>
>> 73 de Mike
>> K7PI
>> Mercer Island, WA
>>
>> ----- Original Message ----- From: "Keith Densmore"  
>> <densmore at idirect.com>
>> To: <r-390 at mailman.qth.net>
>> Sent: Saturday, July 28, 2007 8:38 AM
>> Subject: [R-390] 7 Meg low sensitivity
>>
>>
>>> I have two R-390A's that exhibit the same problem--
>>> lower sensitivity on the 7 meg band but 6 and 8 are fine, as are  
>>> all others. Good double peak on the crystal trimmer, and all  
>>> other alignment issues seem fine.
>>> There might have been a previous thread  on this, anyone remember  
>>> year and month?
>>>
>>> Thanks, 73,
>>> Keith
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>
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