Re: [Amps] 300Hz sidebands

[Jim <jimw7ry@gmail.com>]

What about a different amplifier power supply.


What about a different supply (or battery) for the exciter?


Thanks
73
Jim W7RY

On 5/24/2021 1:09 PM, Conrad PA5Y wrote:
> 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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