[MRCA] Re: [Milsurplus] DAV IF issues

[WA5CAB at cs.com]

Well, that's true.  If the primary is wound over the secondary, that could 
account for it.  But that won't work with double-slug tuned coils.  But other 
transformers of the era that I've seen all have the same coil ID (slug container 
tube is straight cylinder).  But it's an anomaly that will be settled upon 
inspection, I guess.

And I considered the possibility that 4 of the 5 strands were broken but that 
would only jump the resistance up to about 150 ohms.  A bad solder joint is 
certainly a good possibility, though.

In a message dated 9/10/2007 11:22:44 AM Central Daylight Time, jfor at quik.com 
writes: 
> WA5CAB at cs.com wrote: 
> >> Ray, The DAV-2 Instruction Book that I have a copy of gives a remarkable 
>> amount of information on the IF transformers.  Unfortunately, some of it is 
>> clearly incorrect.  But the primary of your Z-101 (Input IF Transformer) is 
>> definitely bad.  According to the detailed information table, the primaries 
>> of both transformers are 510 turns of 5-44 S.S.E. Litz Wire.  DC resistance 
>> given is 30 ohms.  Both secondaries are listed as 600 turns of the same wire 
>> and DC resistance listed is 26 ohms.  Which figures don't agree with the 
>> turns/wire size of course.
>> 
>> 
>  Do you mean that the small number of turns should have the smaller 
> resistance? Not necessarily so, because the average diameter of the coils might 
> differ. The resisance is based on the wire length, of course 
> 
> 

Robert & Susan Downs - Houston
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