[Amps] about the WARC bands of the Heathkit SB-220.

[David G4FTC]

Hi Kouichi,

> To summarize your explanation
> 1) On 12m, set the band switch to 10m
> 2) On 17m, set the band switch to 15m
> 3) On 30m, set the band switch to 20m

Correct.

> However,  need to tune and load properly

Correct. Don't expect it to tune control to be near the expected frequency legend on the front panel.

It will be very helpful to have power meters/SWR meters in both the input and output lines.

Start by setting the load control to maximum capacitance. Apply, say, about 10 watts of drive and rotate the tune control for dip in anode current/peak in power output  on the external power meter. Adjust loading for maximum power output. Slowly increase drive at the same time adjusting the tune and load controls for maximum power out at each level of drive, and repeat the procedure up to 100 watts of drive.

> You did not make any modifications to the SB220.

Correct.

Regards

David G4FTC

________________________________
From: Kouichi Ueno <kueno at wine.ocn.ne.jp>
Sent: 07 October 2024 14:07
To: David G4FTC <g4ftc at hotmail.com>
Cc: amps at contesting.com <amps at contesting.com>
Subject: Re: [Amps] about the WARC bands of the Heathkit SB-220.

Hello David,
To summarize your explanation
1) On 12m, set the band switch to 10m
2) On 17m, set the band switch to 15m
3) On 30m, set the band switch to 20m
However,  need to tune and load properly
You did not make any modifications to the SB220.

Is this correct?

Thank you replay

Kouichi Ueno JI1FGX/DU9