In a message dated 29/06/05 21:50:12 GMT Daylight Time, [EMAIL PROTECTED] 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 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
