[HBR] HBR-67

[kurt]

Jim
Thanks for the response. In general I understand all that you suggest. When 
it comes time to build I will ask some more specific questions.
Regards,
Kurt,  KU7RT
----- Original Message ----- 
From: <n2ey at aol.com>
To: <hbr at mailman.qth.net>
Sent: Wednesday, February 06, 2008 3:15 PM
Subject: Re: [HBR] HBR-67





-----Original Message-----
From: kurt <tem14me at usa.net>

>What changes would suggest to the original HBR-67 design?

Hello Kurt,

Here are a few.....

1) Use more-common tubes than the compactron and the 7360. (If I had
more compactrons and sockets I might think differently)
2) Include switchable IF filters for CW/SSB/AM. Small relays could do
the job.
3) Better dial - capacitor/drive from a BC-455 is one possibility.
Mount behind the panel on spacers, view a lighted disc dial through a
window.
4) Include WARC bands in the converter
5) Choice of active product detector or AM detector rather than "pair
of 1N67s"
6) VFO with more isolation than the 6C4 tickler oscillator used in
HB-67. Dual triode with cathode follower? W2YM circuit?
7) Put the dial on the right for righthand tuning.
8) IF AGC rather than audio
9) If a beam-deflection mixer is to be used, make it balanced. If
that's too much work, how about a Pullen?
10) Better first-IF amp tube than the 6BA6 (6EH7?)
11) Increase tuning range to 600 kHz (3.5 to 4.1 Mc.). This permits all
of 10 meters to be covered with three xtals instead of four.
12) Separate xtal and coil switches in converter
13) Choice of xtal or tunable BFO
14) External power supply
15) Audio section designed to deliver 600 ohm headphone-level audio.
"Speaker driver" audio stage used if speaker wanted.


That's the short list....

73 de Jim, N2EY
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