[Premium-Rx] Another DMS-102-5 ?

[ONL4234]

Hi Henry,

The concept of DAFC is explained in:
http://kahuna.sdsu.edu/~mechtron/PremRxPage/ref_mans/wj357/section2.pdf

You 'll get the general idea from the schematics further in the manual

Greetings from Flanders

Peter


----- Original Message ----- 
From: "Henry Kolesnik" <kolesnik at sbcglobal.net>
To: <premium-rx at mailman.qth.net>
Sent: Thursday, February 15, 2007 9:39 PM
Subject: [Premium-Rx] Another DMS-102-5 ?


>I haven't had any luck in finding any info so  I opened the Nixie 
> display case  and could not see or smell anything burnt.  I noticed one 
> nixie module was a bit loose so I re-seated it and all the rest, voila, 
> all except one came up.  I made a module swap and now then they all 
> worked for about a day. Now, sometimes with the correct frequency 
> displayed and other times with 8000.N, but only the last digit will 
> tune. Probably  corroded contacts and poor seating on the first problem. 
> The second problem may be a cold solder joint since pressure on some 
> boards makes it work for a short time.
> This has DAFC and I know that stands for digital automatic frequency 
> control but I'm not too sure on its use.  There are two rotary swtiches, 
> with one labelled DAFC Last Digit with postions 0 to 9, it doesn't have 
> any effect.  The other rotary labelled MODE with four postions Normal 
> Display: DAFC or Tune and Decimal Shift: Tune or DAFC.  In  both Normal 
> Display positions the Nixie display is medium brigtness and one decimal 
> place shown.  On Decimal Shift in either position the display flashes on 
> and off at high brightness and shows two decimals places.  The Last 
> Digit has no effect.  Any tips on what DAFC is supposed to do and what 
> is an indication that its working properly?
> Still looking for a schemactic.
> This unit is quite sensitive and I pick up many weak BCB stations as 
> well as beacons with a short antenna.
> tnx
> 
> 73
> Hank WD5JFR 
> 
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