Hello Geert.
Yes, I did try 3 different drivers, and several amplifiers off this HT supply.
The same result.
K3S>transverter>driver amp> PA
TS2000
IC746
Same result.
I eventually got the supply out of the rack and took the lid off. The reason
for the sidebands was quite obvious, a previous owner had removed the HT choke,
I also tested the 8uF cap, it was 7.85uF my DER EE DE 5000 LCR meter. The
original choke will be sent to me this week. These sidebands have been there
for the 5 years that I have run this amp.
Regards
Conrad PA5Y
-----Original Message-----
From: Amps <amps-bounces@contesting.com> On Behalf Of Geert Jan de Groot
Sent: 24 May 2021 19:53
To: amps@contesting.com
Subject: Re: [Amps] 300Hz sidebands
On 23/05/2021 20:52, amps-request@contesting.com wrote:
> I have several tetrode amplifiers that run from a 3PH 50Hz supply. With the
> advent of the FT8 I have become aware that I have 300Hz sidebands at only
> -50dBc, this is obviously unacceptable.
Apologies for asking, but have you tried a different driver transceiver to see
if the signal (level and/or frequency) changes?
Geert Jan
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