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Re: LF: 8.97kc - TV transformer info needed

To: [email protected]
Subject: Re: LF: 8.97kc - TV transformer info needed
From: "Mike.WE0H" <[email protected]>
Date: Sun, 30 May 2010 22:03:16 -0500
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Well worth testing. There might be some other transformers that work and
 we won't know which ones until someone tests them. Looks like 4kc is
the peak of efficiency on that transformer you tested. I found 5.8kc is
the best efficiency on my TV transformer.

John B wrote:
Hi Mike, LFers,

I grabbed one of my many MOTs and ran some tests with the primary  connected to 
a signal generator's 600 ohm
output and the secondary connected to a VTVM.  The measured L of the primary is 
.047 H and the secondary L is
16 H.  The turns ratio (120 Volt Primary) is 1:18 give or take a bit.

With the signal generator set at 10 volts RMS, the secondary voltage was 
measured at 1 kHz. steps as below:

Freq. in kHz.   Sec. voltage

          1                     120
          2                     150
          3                     190
          4                      250
          5                      210
          6                      160
          7                      140
          8                      110
          9                        85
         10                       60

The results are poor, just as you found Mike, so it looks like we can rule out 
using MOTs for Dreamers Band.
It's about what one might expect from a transformer designed for 60 Hz. 

73, J.B., VE3EAR

LowFER Beacon "EAR"
188.830 kHz. QRSS30

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