[Lowfer] New bench testing of PA output filter

Tue, 3 Sep 2002 13:51:16 -0500

I am using the same filter and experienced the same thing, I blamed the
harmonics. after retuning and increasing the drive i got back to normal
output.
Lewis
IP @ 185.3004 QRSS 30
God Bless America
----- Original Message -----
From: "WE0H" <[email protected]>
To: <[email protected]>
Sent: Tuesday, September 03, 2002 12:26 PM
Subject: RE: [Lowfer] New bench testing of PA output filter


> Is it possible that the current probe is measuring the harmonics as well
as
> the fundamental frequency and showing them in the readings??? If this is
> true, then there is much to be gained by eliminating the harmonics and
> tuning the loop for better efficiency with just the 185kc signal. What do
> you think???
>
> Mike>WE0H
> http://www.we0h.us/lf.html
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Bill Ashlock
> Sent: Tuesday, September 03, 2002 10:30 AM
> To: [email protected]
> Subject: [Lowfer] New bench testing of PA output filter
>
> Mike and all TX loop enthusiasts,
>
> You may be interested in knowing that when I insert the 63uh-1.8n-63uh
> filter (IE: the Lyle filter) between my final and the loop stepdown
> transformer I loose at least 25% of the loop current for a constant 1W of
> input power. I have tried different types of cores and inductance/capacity
> ratios but the results are similar. Without the filter the total
efficiency
> is about 95% and those little MPS6602/52s run as cool as cucumbers. I
can't
> seem to make the Psice model agree with these results, however.
>
> Bill
>
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