[GreenKeys] Fwd: Pictures

[Ralph Mowery]

I remember seeing that in a 1966 Handbook.   

 

A friend told me he built one many years ago and it worked ok if the signals were good.

 

Are others on the list  seeing about 5 copies of this message.  Seems to be sending it to me many times.

 

 

 

From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Kenneth Gartland
Sent: Wednesday, May 24, 2017 11:40 AM
To: greenkeys
Subject: [GreenKeys] Fwd: Pictures

 

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: 

























Sent from my iPad

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