[GreenKeys] Fwd: Pictures

[Kenneth Gartland]

Hi all!

I hope these pics of the "One-tube TU" make it thru!

There was a bit of chatter last week on the subject
of this very simple, but workable little TU...

I built this unit in 1970 from the 1969 edition of
the  ARRL handbook...

I believe it also appeared in the '66 thru 68' editions
as well...

This was built mainly from junk box parts on hand...

When first fired up, it worked perfectly with an external
130VDC @ 60ma loop circuit...

My first copy was taken on a Teletype Model 14
strip printer, and as tape supplies back then were readily
available, I copied lots of commercial traffic with it,
with no fears of running out of tape...

Later, a friend of mine loaned me a Lorenz LO15
which I used for quite awhile copying RTTY...

The receiver I was using at the time was a brand new
Kenwood 9R-59D, costing a "Princely" sum of $155.00

Maybe some of you fellows remember these receivers...

They looked great, velvet smooth concentric tuning,
ease of operation etc.

One serious downside to this receiver,
was a notorious frequency instability (Drift) problem,
which meant continual retuning to maintain
reliable RTTY copy!

This problem was well documented at the time,
and there were many "Fixes" offered, but not from
Kenwood!

I still have this receiver, mite fix the drifting problem
one of these days!

I understand a few of you radio guys built and used
this TU back in the day...

Were there any improvements made to this design
back in the day?

Was wondering if there was some type of audio filter
that cud have been used between the receiver AF out
and audio in to help combat QRM issues...

Lastly, does anyone know of a similar one or two
tube TU design that might have been tried?

Thanks for listening, hope you enjoyed the pictures!

I will be sending the rest of the pics shortly,

Ken
VE3-HMQ
Cheers!
---------- Forwarded message ----------
From: <1sgartland at gmail.com>
Date: May 24, 2017 10:39 AM
Subject: Pictures
To: "Kenneth Gartland" <trnsrme at gmail.com>
Cc:


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