[HBR] Fw: Re: Simple-X receiver

[windy10605 at juno.com]

Now we're cookin'. That's exactly the rationalle I came up with to use a
regen stage to make up for crystal filter losses ....figured they would
offset very nicely. Thanks for sending the links Niel. I have access to a
qty of 1612Khz crystals so that only cuts off the very top end of 40m.

Question; Can't you use the regen control for a BFO function ?

73 Kees K5BCQ

   
--------- Forwarded message ----------
From: Niel Wiegand <nielwiegand at aggienetwork.com>
To: hbr at mailman.qth.net
Cc: windy10605 at juno.com
Date: Wed, 31 May 2006 20:53:25 -0500
Subject: Re: Simple-X receiver
Message-ID: <447E4895.6070000 at aggienetwork.com>
References: <20060601001039.75BAE859C29 at mailman.qth.net>

I've had pretty good results with a 80/40 mtr superhet running with a 
1700KHz IF. See http://www.io.com/~nielw/3tubrcvr/3tubrcvr.htm and 
http://www.io.com/~nielw/3tube_xtal/3tube_xtal.htm This project started 
out as the two tube superhet shown in  February 1941 issue of QST but I 
changed the detector to a 6J7 and added a BFO. I also put a crystal in 
the middle on the regen feedback loop, helping selectivity a lot.

It is drifty for the first few minutes but once stabilized it is fine. 
Since the same HFO freq range/HFO coil for both 80 and 40, there no need 
to restabilize after changing bands.

My external antenna tuner provides additional image frequency rejection. 
I've not noticed an image problem.

This rcvr is a good match for my 6J5/6L6 xmtr. See 
http://www.io.com/~nielw/2tube_xmtr/2tube_xmtr.htm

Niel - W0VLZ