[HBR] HBR2K Chapter 8 -- It Works!

[hbr@mailman.qth.net]

I just checked; the pictures taken way back before all the parts were 
mounted have been taken down.   New pictures are at:

http://www.timbreblue.com/hb2.jpg

Yep, command set IFTs!

http://www.timbreblue.com/hb3.jpg

The horizontal tube (near center) is the VFO.

http://www.timbreblue.com/hb4.jpg

Upper right: 2nd IF, detector, sideband oscillator, AGC.  Upper left, 
power supply.   Center left, filters (SSB is hardwired right now) and 
1st IF.  Center right, VFO.   Lower left, audio, 2nd mixer, and filter 
driver, crystal calibrator (not wired).  Lower right, bandswitch 
assembly, and (under the trimmer boards) RF, 1st mixer, 1st 
oscillator.

In a redo, I'd keep the general layout the same but spread things out 
some in congested areas (detector, AGC, SSB oscillator) and close 
them up in others (mainly the IF stages).   I think if the SSB 
oscillator trimmer caps and crystal sockets were rearranged it would 
be possible to use the FT-101 internal speaker.

Today I wired a couple of spare triode sections as an electronic 
voltage regulator, using an NE-2 as a reference.   The VFO now runs 
from regulated HV and the 20 cps shift on very strong signals is 
gone.  That made the audio sound better but I think it's still not quite 
right.    I'd put it about in the middle of the pack among ham sets of 
the 60's-70's in audio quality.  This will require further study.

Next, regulated voltage for the 1st IF screen and wiring the crystal 
calibrator.

Walt
KJ4KV