[ARC5] SCR-183 Pop Quiz: What's Wrong With This Video?

[David Stinson]

Hi, Steve.
First- what freq are you using?
How did you neutralize the PA?
Did you check the Neutralizing
coil to make sure it's not open?
I can show you were to check and
how to fix it.
It is very easy to double in the final of
the rig, or have a high-freq parasitic,
which will result in high VSWR reading
of your dipole.

Second- If using them,
ditch all those complex antenna
matching circuits which eat power and
often result in mis-tuning.  You need one
fixed capacitor.  That's all.  My set gets
full rate power out and I regularly check
into local nets when conditions permit QRP.
100 pFd for 80/75, 50 pFd for 40 or 30.
Photo attached.  If you don't have them,
send me your address and I'll mail them
to you.

Next:
Are you using the original tube line-up
or substitutes?  I can tell you the correct
antenna tap for 50-ohms but it depends
on if your using originals or something
like 6AQ5s.
73 Dave S.

On 3/31/2021 10:11 PM, STEVEN KELLER wrote:
> Dave and the Group,
>
> I have my SCR-183 up and running. I even have the RC-12 oscillator 
> courtesy of Mike Hanz KC4TOS. I built a junction box from the manual 
> schematic and all works as advertised. The RF ammeter reads 0.5 amps 
> and the PA and oscillator milliamperes approximate those predicted by 
> the manual. The problem is I can’t get the SWR below 8


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