[R-390] BFO question

[Jim Miller]

Mine doesn't have a center detent, but if I turn it on and turn the knob 
several turns clockwise the beat tone will get higher and higher and then go 
away (it is too farr off frequency), but I turn it back the other way 
several turns and I hear it again.  Just don't force it if it reaches the 
"stops" at either end.  This may or may not be your problem, just a thought 
I had. Could also be a bad contact on the BFO switch.

----- Original Message ----- 
From: "Osamu Hazawa" <pomerol at mocha.ocn.ne.jp>
To: "Jim Miller" <jmiller1706 at cfl.rr.com>; "Kenneth" <crips01 at msn.com>; 
<r-390 at mailman.qth.net>
Sent: Wednesday, June 29, 2005 10:41 PM
Subject: Re: [R-390] BFO question


> Jim,
>
> My BFO doesn't work too.
> How can I find the center of the BFO frequency?
> Is there any mark for mechanical center point on BFO?
>
> Osamu Hazawa
> http://www4.ocn.ne.jp/~pomerol/MyPage/menu0.html
> ----- Original Message ----- 
> From: "Jim Miller" <jmiller1706 at cfl.rr.com>
> To: "Kenneth" <crips01 at msn.com>; <r-390 at mailman.qth.net>
> Sent: Thursday, June 30, 2005 8:22 AM
> Subject: Re: [R-390] BFO question
>
>
>> It is possible that the BFO knob could have been turned multiple times 
>> either way putting the BFO frequency way off.  It could be oscillating OK 
>> but be way off frequency.
>>
>> ----- Original Message ----- 
>> From: "Kenneth" <crips01 at msn.com>
>> To: <r-390 at mailman.qth.net>
>> Sent: Wednesday, June 29, 2005 4:51 PM
>> Subject: [R-390] BFO question
>>
>>
>>>I am going to get the BFO working on My R390A, once and for all. I have 
>>>the
>>> Y2K manual, of course, but I need a little advice. Here is what I have; 
>>> the
>>> BFO does not work, there is no calibration tone in the R390's audio but 
>>> I
>>> can hear it from the SBA-1 side band adapter, I can see a calibration
>>> carrier in the signal strength meter on the R390.  The tubes on the 
>>> IF/RF
>>> module test good, if I can trust my tube tester that is.  Where do I 
>>> start
>>> on this to figure out what is going on. I have replaced the two 
>>> questionable
>>> caps in this module.  The radio works fine otherwise.  I have not been 
>>> too
>>> motivated to repair the BFO because of the side band adapter.
>>>
>>>                             Ken
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>>
>>
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>
>
>