Mike,
Try to use just 65 % of the turns of your primary winding and i bet the
optimum will be on 9 kHz! :-)
73, Stefan
Am 31.05.2010 05:03, schrieb Mike.WE0H:
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.
Mike
WE0H
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. operation.
73, J.B., VE3EAR
LowFER Beacon "EAR"
188.830 kHz. QRSS30
|
