[ARC5] Receiver Drift

[Bruce Long]

Does your am radio IF interference go away completely when the antenna is removed?  If not there are other sneak paths into the receiver IF that need attention.  These could be the ac power connection or the wiring to the speaker, or  headphone.

For what it is worth I have the equipment to measure capacitors and inductors accuratly at 920kHz or most any other operating frequency as well.

If you want to wind some toroids and gather some capacitors and mail them to me I will measurment them for you and perhaps trim to the desired value if you like.

b ruce  kj3z




________________________________
 From: Robert  Eleazer <releazer at earthlink.net>
To: arc5 at mailman.qth.net 
Sent: Saturday, May 18, 2013 2:04 PM
Subject: Re: [ARC5] Receiver Drift
 

A 915 KHZ trap sounds like a good idea; that's the only thing I can think of that might work.  That at least should get most of it.  The case has some large holes with copper (!) wire mesh over them for power supply cooling and it might let in some.

I have retuned an entire IF on an NC-155 to a different frequency and would prefer to avoid doing that again on anything.  And given that the 348 has a pretty good crystal filter it would be durn near impossible anyway.

Not sure why the AM interference is so much worse than it was.  

But anyway, I turned it on this morning and there was WWV right where it was last night!

Thanks

Wayne  
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