[NJARC] Re: [Boatanchors] Why 455?

[NICHOLAS SENKER]

Does this make the Grunow 470 a 'double conversion' receiver?  While we're on the subject of different IF frequencies, can someone comment on what a 'double conversion' receiver is for us non-engineers?  Thanks,
Nick Senker

----- Original Message -----
From: Mbeeferman at cs.com
To: njarc at mailman.qth.net
Sent: Wed, 30 Jan 2008 18:07:40 -0500 (EST)
Subject: Re: [NJARC] Re: [Boatanchors] Why 455?

Visit our web site - See http://www.njarc.org
_______________________________________________
In a message dated 1/30/2008 2:13:58 PM Pacific Standard Time, 
km1h at jeremy.mv.com writes: 
> Further input, corrections, and elaborations are greatly appreciated.
> >>Scolarly reference will be looked upon with great favor.
> >>
I was working on a Grunow 470 (General Household Utilities Co., Riders Vol. 
VI, page 6-2) at the clinic.  Here's how the Service Instructions read:

NOTE:  Due to interference caused by commercial code stations in some 
locations, it has been necessary to use two I.F. frequencies on this receiver, one of 
490 K.C. where code interference is in the neighborhood of 455 K.C. and the 
other where the interfering stations are operating in the 500 K.C. band, we use 
an I.F. of 465 K.C.

The note goes on to say that the IF frequency is stamped on the rear of the 
chassis.

Hope this helps...Marv      
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