O.T. Datong FL3.

[Mike-402]

Hello Everyone!
Just wondering, if, amongst all the expertise & stored info amongst
Elecraft list members, anybody has a schematic, or any other info on the
Datong FL3 Audio Filter. These were made in England back in the 1980s &
I think that Datong is now out of business.

Plan on using it with my 2 x K2s (0681 & 2681).

Thanks & 73 de Mike, zl1mh.



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[Nigel A. Gunn G8IFF/KC8NHF]

Datong (www.datong.co.uk) are now in the surveillance business.
Unfortunately they never released schematics for their amateur products
and often ground off the part numbers from the chips.

Mike wrote:

> Hello Everyone!
> Just wondering, if, amongst all the expertise & stored info amongst
> Elecraft list members, anybody has a schematic, or any other info on
> the Datong FL3 Audio Filter. These were made in England back in the
> 1980s & I think that Datong is now out of business.
>
> Plan on using it with my 2 x K2s (0681 & 2681).
>
> Thanks & 73 de Mike, zl1mh.
>
>
>

--
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Nigel A. Gunn. 59 Beadlemead, Milton Keynes, MK6 4HF, England.
Tel [phone]
e-mail [hidden email] or  [hidden email]
www    http://www.ngunn.net  or  http://www.ngunn.demon.co.uk
Amateur radio stations  G8IFF, KC8NHF
Member of  AMSAT-UK #182, ARRL, GQRP Club, QRPARCI, SOC #548  RAYNET
           Flying Pig #385, Dayton ARA #2128, AMSAT-NA  LM-1691,
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

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[n6wg]

Actually, Mike, I think I've seen mention of Datong in
recent years.  Not totally dead yet.
Dr. D. A. Tong was a very clever designer, but he kept
his designs very close to his chest.  To the best of
my knowledge, the schematics for the FL3 or others
were never published.  I too have an FL3 and would
like to see the schematic, but no joy so far.
73, Bob N6WG

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Mike
Sent: Wednesday, June 29, 2005 11:38 AM
To: Elecraft Reflector
Subject: [Elecraft] O.T. Datong FL3.


Hello Everyone!
Just wondering, if, amongst all the expertise & stored info amongst
Elecraft list members, anybody has a schematic, or any other info on the
Datong FL3 Audio Filter. These were made in England back in the 1980s &
I think that Datong is now out of business.

Plan on using it with my 2 x K2s (0681 & 2681).

Thanks & 73 de Mike, zl1mh.



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No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.323 / Virus Database: 267.8.7/34 - Release Date: 29/06/2005

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[G3VVT]

 
In a message dated 29/06/05 21:50:12 GMT Daylight Time, [hidden email]  
writes:

Actually, Mike, I think I've seen mention of Datong in
recent  years.  Not totally dead yet.
Dr. D. A. Tong was a very clever  designer, but he kept
his designs very close to his chest.  To the  best of
my knowledge, the schematics for the FL3 or others
were never  published.  I too have an FL3 and would
like to see the schematic, but  no joy so far.
73, Bob N6WG



Reply:-----------------------------------------------------------
 
As Nigel mentions in an earlier posting, Datong Ltd are still very much in  
business in more upmarket RF tracking equipment sold to government  agencies.
 
I did contact the company recently trying to obtain a schematic for their  
earlier Datong DF1 FM direction finding unit that was marketed in the mid  
1980's. I have obtained one of these items to help in  the tracking an interfering
signal (moron) on the input to our  local 2m repeater. Unfortunately the
antenna combiner part of the DF1 had got  lost over the years, so the only option
was to build another to get the DF1  working. Contacted Datong via their
website listed address and though they were  initially willing to help, became
unable to do so when a schematic was  requested. Only suggestion they made was to
post a request for help in Radcom or  similar.
 
Never have seen any of their schematics available so possibly none were  ever
given out. I traced out a schematic for their AD170/AD270  active RX antenna
from the PCB as a necessity to repair the unit after it  got zapped by static
electric during my years in the Middle  East.
 
Other than having a go yourself to trace out the schematic from the FL3  PCB,
it may be worth contacting Datong via their website address to see if  they
will help with the FL3 schematic.
 
As a footnote did finally find a project unit that was very similar  and
compatible to the Datong DF1 that had the schematics available plus the  necessary
blank PCBs. In process of constructing this unit at present.
 
Bob, G3VVT
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