[R-390] BFO Question

[flood@Krohne.com]

Phil,

Sorry to you and all, I should have mentioned it but I thought of this as
well and removed the knob and tried the whole range of the control.  Two or
three times the bfo came to life but any shaft movement would kill it
again.  That is why I purchased the new bfo.

Thanks,
John Flood KB1FQG
TASC Department
KROHNE, Inc
7 Dearborn Rd.
Peabody, MA   01960
Tel.:  978-535-6060 / 800-356-9464
Fax:   978-535-8180


                                                                                                                                              
                    <plmills@attg                                                                                                             
                    lobal.net>           To:     <flood@Krohne.com>                                                                           
                                         cc:                                                                                                  
                    03/11/2003           Subject:     Re: [R-390] BFO Question                                                                
                    06:27 PM                                                                                                                  
                                                                                                                                              
                                                                                                                                              




John,

Did you loosen the BFO knob on the shaft and
try to bring it within range?  There is a physical
stop on the front panel that keeps the knob  from
rotating more than half way in either direction.....
but the bfo inductor is a multiturn job.

I've had this happen on a recently acquired R-390A.
The bfo would barely come within range but I just
loosened the knob, pulled it back from the stop,
zeroed the bfo, then reset the knob.

good luck,
Phil

----- Original Message -----
From: <flood@Krohne.com>
To: <r-390@mailman.qth.net>
Sent: Tuesday, March 11, 2003 9:23 AM
Subject: [R-390] BFO Question


> Greetings all!
>
> Wow I get to ask my first question!  Please forgive my being a bit rusty
on
> hollow state technology.  I had my training during the fall of hollow
state
> and the beginning of solid-state and as it would turn out I know enough
> about each to be dangerous.
>
> My early 60's vintage Amelco R-390A has bfo trouble.  It would generate a
> signal  but the frequency sounded high (sorry did not measure it) and
there
> was very little adjustment with the dial.  A tube swap did not help and
> looking at the drawing and being dangerous as mentioned above, I thought
> that there was not much that could be wrong there other than the little,
> pto I think, bfo can.  A new one just arrived from Fair Radio and thus
> generates, pun intended, my question.  The shaft on the new bfo can is a
> bit stiff not easily turned by fingers.  There seems to be a bit of
> oxidation on the shaft bearing.  Is it OK to put a drop of oil on it
> without risking damage of some type and if so what is the official BFO
lube
> approved by the list?  I certainly don't want to get blacklisted for
using
> solid-state lubricant.
>
> Is the old bfo repairable?  I can't resist opening up little things like
> this, especially if it has a stamp telling me not to do so!
>
> John Flood KB1FQG
> TASC Department
> KROHNE, Inc
> 7 Dearborn Rd.
> Peabody, MA   01960
> Tel.:  978-535-6060 / 800-356-9464
> Fax:   978-535-8180
>
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