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Date: Sun, 30 May 2010 19:25:03 +0200
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1C14@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: LF: 8.97kc - TV transformer info needed
Thread-Index: Acr/9HvN2HbliXLNRqCHW9pYvNzcCQAJZvG4
References: <20100530.082855.1608.1.riese-k3djc@juno.com>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Subject: AW: LF: 8.97kc - TV transformer info needed
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Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Dear VLF,
=20
In germany there is a distributor that offers such a TV transformer, of co=
urse without the HV cascade, so with an AC output. I have ordered such one=
 (not this one of my picture i sent). There was a stamp, dated 1988, out=
 of the DDR (GDR) ;-) It costs just abt 7 EURO and the secondary is put in=
 epoxy.
=20
So, generally, the TV transformers have been used at higher frequencies in=
 the TV so there will be no HV problems. There will just be thermal proble=
ms if the output current gets to high for a longer time.
=20
Remember that the ratio between voltage/frequency has it's limit for a giv=
en core, so the high output voltage (anyway if with or without a load) wil=
l not be the problem. Thus, the question is not "How many amperes can the=
 transformer stand" but "what is the maximum voltage per turn that can be=
 applied". This depends on the core dimensions and the core material so on=
e has to check this by applying a new primary winding, say 8 turns and wat=
ch the output voltage or the DC current of the PA. Change the frequency an=
d check where saturation occurs. If you want a optimal winding for 8,97 kH=
z, the core gets into saturation at say 8 kHz. If it occurs at 4 kHz, just=
 half the number of turns...
The output transformer of my 300W PA used in the first experiments gets in=
to saturation at about 8 kHz. I have to apply 17,94 kHz since there is a=
 frequency divider in the circuit to achieve an exact 50% duty cycle for=
 the FETs. When driving the PA at 8,97 kHz, it takes 0,15A DC current at=
 13,8V. Once i have done local tests with the VFO on 8,97 kHz and have for=
gotten to double the f for the PA, so i drove the transformer with 3,985=
 kHz (without a load). In this case, the DC current was > 3A since the cor=
e was in saturation!
=20
One way to achieve the maximum output voltage is to adjust the air gap bet=
ween the core ferrite core parts, e.g. with a piece of paper. With that yo=
u can adjust the L and resonate the antenna, or come closer to resonance.=
 This also changes the frequency where saturation occurs (to lower frequen=
cies) so you have to adjust the primary winding after resonating or just=
 apply a higher input voltage ;-)
=20
Wish you good luck with the TV transformers.
=20
In the last days here on the reflector was much traffic on the VLF theme.=
 This is good entertainment. So, no one here still needs his TV any more,=
 right? Just take the transformer out of it, if it is old enough ;-)
=20
73, Stefan/DK7FC

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von riese-k3djc@juno.co=
m
Gesendet: So 30.05.2010 14:18
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: 8.97kc - TV transformer info needed




I need to look around for an old tube TV for the same thing

Just wondered how well a neon sign transformer would work.
back in the days I used a pair of HV transformers
back to back as a modulation transformer which appeared to work as
well as one designed for that. so it passed good audio up to 3Khz at
least
I also use a standard transformer in a LF converter which works
well up to 200 Khz or so. The point being would an iron core transformer
work in low power tests at elf ?

Bob K3DJC


On Sat, 29 May 2010 21:48:48 -0500 "Mike.WE0H" <we0h@gmx.com> writes:
> Found my Zenith black & white TV chassis tonight. Got a flyback
> transformer that looks like Litz wound with bees wax for potting
> compound. No diodes, lots of room for the primary winding that I
> need to
> wind yet. Should be good to go now for some 8kc experiments.
>
> Thank you everyone for the advice on the transformers today. Now I
> have
> the correct one on my bench.
>
> Mike
> WE0H
>
>
>

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