[R-390] Image problem solved - Not.

[Jim M.]

Just out of curiosity, how "hot" is the receiver on the bands in question?
The CAL signal should be probably no more than mid scale on the signal meter
(if using an original meter).  The manual says about 2 units minimum.

If your front end RF amp is not getting AGC it could cause an overload and
make the radio appear to be very hot (sensitive).  The front end AGC can be
affected by things like oil on the Ant trim shaft insulator (seriously), a
leaky AGC cap in the RF module, etc.  Have you replaced the RF amp tube?

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Tony Casorso
Sent: Thursday, October 25, 2007 7:41 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Image problem solved - Not.

Sorry everybody,

I lied. I didn't mean to but I did. Tonight I tried to repeat the experiment

and it doesn't work.
Lifting the ground from one side of the balanced input does absolutely 
nothing to help the situation.

I'll bet that I had a bad connection to one side of the balanced connector 
since I had to jerry rig it to connect my BNC from the antenna to the 
balanced input without ground. I hear no harmonic at all when only one pin 
of the balanced input is connected to the antenna. I also hear only a faint 
hint of a harmonic when I use the unbalanced input.

So, I still have the problem (if it's really a problem). It's not an image 
problem really. I'm sorry I called it that. It has nothing to do with the 
IF.

I'm going to go away now. I'll make sure everything is repeatable before I 
bring it up again.

I feel like the Rockies must feel after the disaster in Fenway last night. 
Well, maybe not quite that bad.

Tony



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