It tells me that the pi net is not optimized for those bands and efficiency
dropped for that reason and the input filters are not wide enough for those
bands as well and drive power is less.
There is no such thing as RF power being send back to the power supply!
73
Peter
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Thomas
Sent: Dienstag, 12. Oktober 2021 16:06
To: Victor Rosenthal; Dick NY1E
Cc: Amps reflector
Subject: Re: [Amps] TL-922A on 17 & 12
This tells me 100-200w are being sent back to the PS by a partially
resonant choke, thus the "brown spots".
You need to use an accurate grid dip meter with the choke in circuit to
measure for any resonances near the
freqs you plan on using. If you make any changes like adding or removing
windings, you would need to check
all the bands again! If the choke opens and unwinds during operation, it
could short the B+ to ground! Bang!
73
de W2CO
On 10/11/21 8:50 PM, Victor Rosenthal wrote:
> Yes, it does work, although output is slightly lower than other bands. I
> use my tl922 on the WARC bands as follows:
> 30m - bandswitch on 20
> 17m - bs on 15
> 12m - bs on 10
> Power output is 1 - 1.1 kW compared to 1.2 - 1.3 kW on non-WARC bands.
>
> Victor 4X6GP
>
> On Tue, Oct 12, 2021, 05:12 Dick NY1E <dick@ny1e.com> wrote:
>
>> I don't want to find out the hard way, does the plate choke on a TL-922A
>> work on 17 & 12 meters? 12 meters is really coming to life and I get
>> temped...de Dick NY1E
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>>
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