On Wednesday, September 24, 1997 20:12 PM, Ken Kreis,
>I am curious as to:
>Where did the 301 homebrew info come from? Is the info on homebrewing a 301
>clone available in a past e-mail posting?
>Thanks to all !
Steve/N6TT is right. I acquired some random parts from Ten-Tec that
they had left over from their old production run of the 301's. I put
together the unit. Basically, the hardware inventory is pretty light:
Rotary encoder (T-T provided)
5 post terminal strip (T-T provided
a cable (T-T provided a 1.5' coil (mic?) cable; I subbed a 5' cable)
a 25-pin RS-232 type connector
an enclosure (T-T still had an original 301 enclosure)
rubber feet (T-T provided)
Main Tuning Knob (a la Omni, etc.)
T-T did not have any specs or drawings, so I winged it. It was
really (in retrospect) very easy. The Rotary Encoder had five
pins, four of which were marked (A, B, +, -). It was pretty simple
to figure out what went where--actually, the most distressing part
of the whole thing was that the encoder was faulty. T-T shipped
a replacement when I told them what I had found. It worked FB
and still works FB.
If you are interested, you might call T-T Service and ask (beg?)
if any 301 parts remain -- the encoder is the most important piece;
you can use any enclosure and knob.
Here's a note I sent out some months ago.....
As far as I know and based on what Scott Robbins, Sales Manager
for Ten-Tec, says, there are no plans within Ten-Tec to go back to
producing the Model 301.
The parts list is extremely simple :
There are only 4 connections to the rotary decoder and
the cable connector. Otherwise, any box and knob will
do--my recommendation is a sloped front box and a $15
Omni VI main tuning knob from Ten-Tec.
I don't know if you can buy the decoder directly from Oak Grigsby,
but you can ask. Also, Ten-Tec may have one on the shelf that
they might sell you (they are used in the Omni VI for VFO and RIT.
It will probably cost around 40-50 dollars.
You want the Oak Grigsby encoder, model 90Q125-02-00245.
The schematic is even simpler:
Encoder: - = (ground)
empty = nothing
A = (phase 1)
+ = (+5v)
B = (phase 2)
(-, A, +, B = pin identifiers on the encoder)
DB25(to radio): 1 and 14 = (ground)
6 = (Phase 1)
8 = (Phase 2)
16 = (+5v)
I made a y-cable with three DB25's: a DB 25 plugs into the radio, the other two
are well marked for (1) the remote vfo control and (2) the computer. That way,
I can use only the computer or only the remote vfo control or both.
I built mine from Ten-Tec purchased parts. I'm not sure how
many of the original parts from the 301 they still have. Basically,
all you need is the clamshell case, a weight for the base, the
encoder and the knob. You make up your own cable (any
reasonable length you need) and connector.
So, Ken, if I were you I would go ahead and contact T-T service and
see what, if anything, they have left from the 301 stock.
Oak-Grigsby, a rotary encoder manufacturer, and the manufacturer
of the one T-T sent me, is at 84 North Dugan Road, PO Box 890,
Sugar Grove, IL 60554-0890, phone: 630-556-4200. I had called
them for a spec sheet on the encoder. I spoke with Mark Lambert
there. You might check with them to see where their outlets are
if Ten-Tec does not have any encoders.
Dale Martin, KG5U
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