[R-390] My R-392 Starts Singing

[Barry Hauser]

Hello Ozamu:

It is possible that you have "inch" -- English -- sized allen keys in the 
form of bits to one of those multi-purpose screwdrivers or tool kits.  I am 
thinking of the inexpensive ones that have all kinds of tools in them and 
lots of bits.  Often they have a whole row of metric and another of English. 
One tends to forget all that's in them.  I also have one set that came with 
allen keys -- one set in chrome, the other black -- one is metric, the other 
is English.  So the right tool might not be with your good tools ones but 
with one of those sets.  Most are made in China or maybe some in Taiwan. 
They vary in terms of what they include.  I mention this because they are 
the kind of thing I buy on impluse -- and because they're cheap -- just to 
have around, and then forget about them.

You might be able to open it with the closest fitting metric size that's a 
bit smaller, maybe with a bit of tape on the end of the Allen wrench.  It 
may be that the case bolts are not in too tight -- but don't force them with 
the wrong size key in there or you may damage the hex socket in the bolts.

Sounds like you need to check some tubes first.  Also, the calibrator works 
on harmonics which, as I recall, get weaker higher up in frequency, so if 
the calibrator tube is weak the effect will be more so.

Also, I think 8-32 mHz corresponds to the switchover to triple conversion, 
so that's a clue.

good luck -- let us know how you're doing.

Barry





----- Original Message ----- 
From: "Osamu Hazawa" <pomerol at mocha.ocn.ne.jp>
To: <R-390 at mailman.qth.net>
Sent: Tuesday, January 10, 2006 8:24 AM
Subject: Re: [R-390] My R-392 Starts Singing


> Hello Francesco, Dan, Barry and Tom,
> Sorry for late response.
> Thanks for your overwhelming information and sagas about R-392.
> I'm so excited about you are being with me.
>
> I have less infromation about my R-392 because I've just started
> working with it.
>
> The symptoms I noticed so far are:
> (1)Fair signals can be heard on BC bands (0.5MHz through 1.6MHz).
> (2)Signals can be heard up to 7.999MHz but are getting weaker on higher 
> range and white noise is heard on every around 80kHz(
>    This may be caused by a noise generated inside my house).
> (3)Weak Cal tone is heard on some bands and no Cal tone on other
>    bands, from 8MHz to 32MHz.
> (4)AGC and limitter is working but the meter indicates under zero without 
> a signal.
> To my shame, I noticed I had forgotten to buy a set of inch size Allen
> keys for use of opening up the chassis!!!
> So what I can do for now is only wiggling the MC knob back and forth :-)
>
> 73's
> Osamu Hazawa
> http://www4.ocn.ne.jp/~pomerol/MyPage/menu0.html
>
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