[Central-Electronics] new 20A owner follow-up

[WHITEHEADG at aol.com]

I have a couple of 20As , a 100V and numerous other CE devices, with the  
intent of refurbishment. I'll be interested in following your progress on  
restoration. And around 1957, I built an 80-meter phasing exciter based on the 
 GE Ham Notes, SSB Jr. design.
 
73,
 
George, W1BOF
 
 
In a message dated 12/07/2016 12:45:43 P.M. Eastern Standard Time,  
mcinsand at gmail.com writes:

Thank  you for the welcoming to the list, and I am relieved to know that the
list  is still active.  Until last year, I thought that I knew  something
about ‘vintage gear’ after time with an HW-101, Swan 500 CX  (still kicking
myself for selling that one), and homebrew MOPA.  What  did I know?  Not
much.  Things were apparently a bit different in  the early days.  Harmonics
apparently weren’t always something to  fight at all costs, especially when
they saved the cost of having to buy  new crystals.  Last year, I revived a
DX-20, and it taught me that I  didn’t necessarily have to have a 20 meter
crystal to work on 20. Rockbound  operators in the 1950s apparently learned
how to make the most of their  rocks.


As I mentioned yesterday, the 20A was a windfall.  To  be a bit more honest,
I wasn’t sure what to make of it or whether it would  be anything that I
would make use of.   Hi!


Cal:


>> if you have any questions that I can  help with don’t hesitate to ask.


I hope that you don’t regret that  remark, but I do have some questions,
particularly with respect to  CW.  I fear that I might be reading the manual
a bit too  optimistically, which wouldn’t be the first time.  The  two
three-sentence paragraphs on pages 2 and 14 are a bit sparse, so I want  to
double-check my understanding.  If I have this correct, the CW  signal can
come from the 9 MHz carrier sum/difference from either VFO or  crystal, as
well as from tuning on the mixer output from the crystal  itself.  So, to
get 14.125 MHz, either a VFO or crystal at 5.125 or  23.125 MHz will work,
or a 14.125 MHz crystal can go into the front  panel.

If my understanding is correct, I would rather use the 20A than  my MOPA.
The MOPA still has the oscillator whistling when not keyed.   As for keying
the power amplifier, I'd rather not deal with  chirp.

For another question, how is the output filtering on the  20A?  I've been
thinking of throwing together another Z-match.   Now might be the time.

Paul:

>>Now I'm trying to perfect  the 458 CE mods and have basically started
fresh on that one.

I have  to hang my head in shame as I admit to pondering the use of an
AD9850  DDS.  I have one that I lashed up quickly for use as  a
smartphone-driven generator.  Operation is clunky, though, since  I've been
controlling from a command terminal instead of an app.  Over  the course of
unpacking, I hope to find my LCD's and  encoders.

73
Stan
KD4BTH
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