Ah!
Yes ok, so it's only to give you a general idea on the power not actual
numbers. That explains it.
-Warren
On 07/25/2017 7:47 am, Glen Zook wrote:
> The meter reads "relative" power and, as such, the meter calibration has no
> meaning in terms of actual power output other than a higher reading, at any
> particular setting of the "sensitivity" control, means more power output.
>
> Glen, K9STH
>
> Website: http://k9sth.net
>
> -------------------------
> FROM: Warren Volz <warren@warrenvolz.com>
> TO: amps <amps@contesting.com>
> SENT: Tuesday, July 25, 2017 2:01 AM
> SUBJECT: [Amps] SB-220 no output
>
> All,
>
> I ran into another hurdle with the SB-220 and am hoping someone has some
> wisdom. If I run RF through the AMP without power applied the relative power
> meter works and I can match my dummy load without issue. Side note, is the
> relative power meter supposed to line up on the bottom scale with actual
> forward watts? Ie: 100 Watts = 100 on the multimeter scale? Once I enable my
> rigs "amp keying" mode and transmit with anything from tune mode to a carrier
> I see high SWR and 0 output after the amp.
>
> To troubleshoot, I hooked up my DMM and triggered the keying interface so
> that the relay(s) engaged. I've confirmed that both are working correctly.
> Oddly if I put the DMM in continuity test mode and trigger the TX mode on the
> amp I get a beep. So, the RF is blocked someplace inside the tank circuit or
> band switch? That's my best guess. Or is it possible that a bad tube would
> cause these symptoms? There is no deflection on the plate meter when I've put
> RF in. Does that mean the tube is being held in cutoff?
>
> Thanks for the help again. It's challenges like this where I wish I had a
> local elmer to help out!
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