[R-390] 7 Meg low sensitivity

[Keith Densmore]

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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>