[Collins] Re: My first technical question

[Jim Brannigan]

Why fool around by driving the pants off a radio for a few watts?
get a 5KW amp and do it right!!!!!!

Jim
----- Original Message -----
From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
To: "Wn4i" <wn4i@arrl.net>
Cc: <collins@mailman.qth.net>
Sent: Saturday, June 29, 2002 10:46
Subject: [Collins] Re: My first technical question


> Wn4i wrote:
> >
> > Welcome Jerry ......In  SSB are you in favor  of using  a somewhat
higher
> > Plate voltage ( 900-1000 volts using solid state 5R4 )  to protect the
> > screens from secondary emissions .....and have a good 120 watts output
as
> > well ?
> >
> > Same question  for the 30L-1  ...are you in favor of using BIGGER
voltage
> > doubler capacitors ... like I do ...to improve the dynamic regulation
for
> > every peaks of my modulation .....800 watts peaks easy with no problems
> > since 1997 ?...Dxing every day .
> >
> > Be free to answer to the full Collins list if you like ......mentioning
my
> > name or not .
> >
> > Best Regards
> >
> > Yves  Wn4i .
> >
> > Yves Pautard
> > 5833 Dryden rd.
> > West Palm Beach
> > Florida 33415.....561-689-8819
>
>
> Yves, I don't object to the higher plate voltage, thus lower heat
> dissipation in the power supply, but I do not favor higher RF output.
> The loading capacitors and tubes are marginal, and the limited load
> range of the S-Line /KWM2 Pi network can stretch them further. I prefer
> to run 6146B at 6146 ratings for super longevity of the tubes and better
> longevity of the loading capacitors. the 20% power difference is less
> than a dB and can't be detected at any distant location, propagation
> changes several times that amount each minute.
>
> Larger power supply capacitors nearly always lead to better dynamic
> regulation, though one should be certain the larger capacitors, and the
> rectifiers, are capable of the increased peak currents from
> rectification and supplying the load peaks. Greater capacitance in the
> same package, does not necessarily increase the ripple current rating of
> the electrolytic capacitor. In the case of the 30L1, rectification peak
> currents are pretty much limited by the transformer windings so changing
> the capacitors won't increase the peaks significantly.
>
> 73, Jerry, K0CQ
> --
> Entire content copyright Dr. Gerald N. Johnson. Reproduction by
> permission only.
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