[R-390] BFO Question
[email protected]
[email protected]
Wed, 12 Mar 2003 11:12:01 -0500
Oops hit send to soon, Thanks to all who have made suggestions for checking
out the BFO. Perhaps I was not clear enough in my question. I am going to
replace the bfo and I would like to know is it safe to add some "oil" to
the shaft of my new "unused" Fair Radio bfo. I just opened it and the
shaft is a bit tight. It seems to be from a small amount of oxidation from
sitting in the box all these years. Sorry for the confusion here.
John KB1FQG
[email protected]
Sent by: To: <[email protected]>, [email protected]
r-390-admin@mailm cc:
an.qth.net Subject: Re: [R-390] BFO Question
03/12/2003 09:57
AM
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: <[email protected]>
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: <[email protected]>
To: <[email protected]>
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
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>
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