[AMRadio] You are right!!

[Dan Hall]

Bill:
The transformer looks like this:
4           5 6        7        8        9   secondary
lmmmml  lmmmlmmmlmmml
=======================
lmmmmmmmmlmmmmmml     primary
1                         2                  3

Notes tell us that 6,7,8,9, are 3000 ohm 8 watt taps. Taps #4 and 5 are to match 4750 ohms at 700 watts max. This is what the scheme shows.


I think I got it.

Dan


----- Original Message ----- 
From: "Dan Hall" <kj7fx at tdn.com>
To: <amradio at mailman.qth.net>
Sent: Wednesday, March 20, 2002 11:08 AM
Subject: [AMRadio] You are right!!


> Bill:
> I was just this minute looking through the manual!! Man, you are so right,
> The secondary is two coils. This does not show on the main modulator
> schematic. I think there is no way that it would have worked using the
> connection numbers the main scheme calls out.  I am going to take some
> readings on this thing and see if something  in the literature tells me how
> to hook the darn thing up.
> 
> Wow.
> 
> By the way Dudley, I found the spec. sheet on the Mod transf. and will relay
> the info to you if I need one.
> 
> Thanks guys
> Dan
> ----- Original Message -----
> From: "Bill Smith" <billsmith at ispwest.com>
> To: <amradio at mailman.qth.net>
> Sent: Wednesday, March 20, 2002 10:46 AM
> Subject: Re: [AMRadio] Bad news on BC1-J Mod trans.
> 
> 
> >
> > Hi, Dan
> >
> > I looked up what I think is the mod transformer in the Peter Dahl catalog.
> > Too bad about the replacement cost, but notice that there are apparently
> two
> > secondaries on the transformer.  Have you identified both secondaries?
> (My
> > apologies if this is too simple.)
> >
> > GATES BC-1 MOD TRANSFORMER
> > P/N 478-0410-000
> > CORE) A-0525/ C-CORE         STYLE #) 09  HIPERSIL C-CORE
> >
> > PR) 2450 VCT PP 833A'S
> >
> > S1) 1800 VAC @ 750 VA
> > S2) 80/110/155 VAC @ 8 VA
> >
> > DM) HT = 10.625 WT =  7.375 DT =  6.750 MD =  4.750 MW =  5.750
> > PRICE)    $995.00 Plus S&H FOB El Paso, TX    WEIGHT)   49  LBS
> >
> > 73 de Bill, AB6MT
> > billsmith at ispwest.com
> >
> >
> > ----- Original Message -----
> > From: "Dan Hall" <kj7fx at tdn.com>
> > To: <amradio at mailman.qth.net>
> > Sent: Wednesday, March 20, 2002 10:23 AM
> > Subject: Re: [AMRadio] Bad news on BC1-J Mod trans.
> >
> >
> > > Bill:
> > > I guess I first became convinced that it was a modulation transformer
> when
> > I
> > > noticed the printing on the top of the thing that says; Gates Modulation
> > > Transformer part # AM 30469E
> > >
> > > Sorry about the sarcasm, Bill
> > >
> > > Dan
> > > ----- Original Message -----
> > > From: <wwd at netheaven.com>
> > > To: <amradio at mailman.qth.net>
> > > Sent: Wednesday, March 20, 2002 9:51 AM
> > > Subject: Re: [AMRadio] Bad news on BC1-J
> > >
> > >
> > > > Dan,
> > > >
> > > > Are you sure it really is a mod xfmr? Maybe a power xfmr pressed into
> > mod
> > > > duty?? It has happened more than once and they can function failry
> well.
> > > > Your description of seems odd, though.
> > > >
> > > > In <002c01c1cfdb$19c653e0$47190242 at K6BW>, on 03/19/2002
> > > >    at 10:47 PM, "Bill Smith" <billsmith at ispwest.com> said:
> > > >
> > > > >Dan, big transformers like that don't open very often, they usually
> > > > >develop a short between turns.  I'd look very carefully at the
> > terminals
> > > > >to see if you can find a broken wire on the outside of the core.
> > > >
> > > > >Here's hoping!
> > > >
> > > > >73 de Bill, AB6MT
> > > > >billsmith at ispwest.com
> > > >
> > > > >----- Original Message -----
> > > > >From: "Dan Hall" <kj7fx at tdn.com>
> > > > >To: <amradio at mailman.qth.net>
> > > > >Sent: Tuesday, March 19, 2002 5:58 PM
> > > > >Subject: [AMRadio] Bad news on BC1-J
> > > >
> > > >
> > > > >> Well Folks:
> > > > >> A couple of years of on and off labor (several hundred hours) ,
> > several
> > > > >> hundred dollars, and lots of hopes.  My modulation transformer is
> > open
> > > on
> > > > >> the secondary side. No wonder the tubes acted like they were doing
> > > their
> > > > >> jobs. It just wasn't getting through to the other side.
> > > > >>
> > > > >> I'm parting it out. I'm done.
> > > > >>
> > > > >>
> > > > >> Dan
> > > > >> KJ7FX
> > > >
> > > >
> > > >
> > > > Bill    N2KQA
> > > > --
> > >
> >
> > --------------------------------------------------------------------------
> > > ------------
> > > > wwd at netheaven.com  To the warriors go the spoils of war; to the
> hindmost
> > .
> > > .  the surplus.
> > >
> >
> > --------------------------------------------------------------------------
> > > ------------
> > > >
> > > >
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> 
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