[GreenKeys] TU on ePay...

[Ralph Mowery]

They will probably tune down to the 170 Hz shift without any padding.  I had one many years ago that came with the mod 19.  It was set for 850 shift but tuned up for the 2125 and 2295 tones for narrow shift.  If you put a good audio filter set for 170 hz shift in front of it you can get good copy of the 170 hz shift.  The tuning is very broad and if you hook a  scope to it the cross hairs look like two large footballs.

 

You can always try replacing the TV type coils with the often used 88mh coils and capacitors for sharper 170 hz shift.

 

I used it mainly on a FM repeater and it worked fine there on 170 hz shift.  It would work on the low bands fairly decent if there were not any stations close by and the signals did not fade.  

 

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Kenneth Gartland
Sent: Monday, October 23, 2017 9:48 AM
To: greenkeys
Subject: [GreenKeys] TU on ePay...

 

Hi all!

 

The TU has found a new home...

 

Jack was rite, he was likely the only one to have

seen it, as it was not found in the normal 

RTTY/Teletype haunts...

 

I was going to pass on it, but realized the treasure

trove of hard to find costly parts in this well built

TU!

 

I gess I have a penchant for these old relics

of yesteryear, and enjoy messing with them...

 

It is for sure a W2PAT design, and from what

I can see in the fotos, the original builder

put a lot of quality in the contruction...

 

The only downside of if it all is the TU is likely

set up for the old 850hz shift, and I am not

sure if the slug tuned coils can be padded

enuf to make it work with the 170hz shift...

 

I'll have to play around with it a bit to see if

it is possible...

 

I got a similar W2PAT unit from Jim awhile back

and still working on it in spare time...

 

It appears the orginal owner strayed somewhat

from the circuit as designed, so it needs

a bit of "Reverse engineering"

 

It is different in as much as it uses a 255 relay

to key an external power supply and loop...

 

This one uses a 6Y6 tube as a magnet driver...

 

Tks Jack for bringing this item to our attention...

 

Cheers!

 

Ken

VE3-HMQ

i-Telex 61663

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