On Thu, 18 Feb 99 09:20:26 -0600 Jon Ogden <firstname.lastname@example.org> writes:
>>More to the point, exactly what is the 10M input network, as I asked
>>weeks ago ?
>I have not gotten back inside the bottom of the amp since then. And
>don't have the values handy now. I will get to this eventually.
I'll reply eventually then also. Sorry for the few day delay in
responding but trying to cram 13 hr days in M-TH and 9 hrs today in order
to cover my trip to NC next week.
My boss wanted that 40GHz PA testing finished and the 20 piece
evaluation kit shipped.
>>Have you ever measured any of the LC values?
>>What is the material in the slug tuned coil?
>No idea. Again, this amp came from an estate sale. Yes, it probably
>would have been better to build it from the ground up myself. Such is
>life. I used what it came with.
Which may be the crux of your grief. Whenever I get an amp in for repair
I ALWAYS rip out the add-on parasitic garbage and proceed " as designed"
>>What is the wire size and coil diameter?
>Coil diameter is probably about 1/2 inch. Wire size is #18 magnet
>if I remember correctly.
The sizes are fine, now to determine the core material.
>>What is the output on 12M, 15M, and descending bands?
>Not set up for 12M, 15M I top out around 1100 if I remember right. I
>haven't messed with it too much there. On 20 I get out about 1400, 40
>get around 1600 and on 80 I get around 1800.
Almost sounds like a soft tube OR lossy input coils as the frequency
increases. I try and use 20M ( based on my old 4x1 building days) as an
efficiency guideline. IOW, if I get 65% efficiency on 20M I will not
accept more than a -10% deviation on other bands. This often requires
playing with Q and minimum C values to get what works....not what looks
good on paper.
Modern tubes offer an even closer tolerance.
>>What is the exact VSWR on all those bands?
>Input VSWR? Less than 2:1 for sure can be tuned to 1:1.
>>Its my turn for questions. How about only answers for once...
>Well, how can I give answers when I don't necessarily have them.
If you expect guidance you best have answers to questions . " I dunno"
dont cut it. "I do not know but will get back to you is fine."
73 Carl KM1H
>"A life lived in fear is a life half lived."
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