[HBR] HR-67 / balanced 7360

Sat, 13 Apr 2002 12:48:06 -0400

Just a comment about what I used to do to eliminate strong local BC
stations. Agreed, a high pass filter is what is required but an elliptic is
the best choice as then you can by careful design place some of the zeros on
the offending BC stations and get more rejection than you would with a
simpler high pass design like a Butterworth or Tchebychev with all their
zeros at DC. 73 - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Saturday, April 13, 2002 11:02 AM
Subject: Re: [HBR] HR-67 / balanced 7360

> The Southgate Type 7 receiver section has a 1400 kHz IF, a single-ended
7360
> mixer and 6EH7 RF amp. Also a 5 pole highpass filter to help eliminate BC
> band signals. IF rejection problems were simply insurmountable without the
RF
> stage. The 1400 kHz IF filters were hamfest specials and simply too good
to
> not use.
>
> 73 de Jim, N2EY
>
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