Jeff,
Thanks for the thought which is something I did not check. (nor do I
know how at the moment, I'll have to find the book)
I did check the obvious solder connections that usually fail and even
re-flowed them. The POT "seems" ok as when the amp finally does reach
full power, the POT varies
> After letting it cool, I key'd it up again. It immediately went up to
> only 20 watts, then after about 30 seconds it hit 75 watts
> and finally
> after close to a minute and a half, it hit 100 watts. I let it cool
> again, and same thing. This appears to be the way this amp is as
> nothing
The power control pots on these are notorious for going flakey.
Chuck Kelsey wrote:
>
>
> In addition to checking the solder joints on the transistors, check the
> connection between the PA output and the harmonic filter. This is another
> prone intermittent point.
>
> Chuck
> WB2EDV
>
> - O
You sure that thing's driving into a solid 50 ohm load that isn't heating up
and changing characteristics? I won't fire up a MII PA into anything other
than my 500W Bird load... seen too many cheap 100W "brick" style loads that
aren't 50 ohm, aren't consistent, etc. I'm also concerned about yo
In addition to checking the solder joints on the transistors, check the
connection between the PA output and the harmonic filter. This is another
prone intermittent point.
Chuck
WB2EDV
- Original Message -
From: "Adam Feuer"
To:
Sent: Monday, November 23, 2009 6:27 PM
Subject: [Repe
first thing i would check would be aging solder joints, all the expansion and
contraction due to heat and cold can make them loose integrity.
--- On Mon, 11/23/09, Adam Feuer wrote:
From: Adam Feuer
Subject: [Repeater-Builder] UHF Mastr II PA - SLOW
To: Repeater-Builder@yahoogroups.com
Date:
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