[Test-Equipment] Millen GDO question

[Mike Manes]

Hi Richard,

That's pretty characteristic of every GDO I've used, including the
Millen, a Knightkit and a really nice piece of homebrew work. I
think it has to do with the low VHF Q of the air variable cap that's
necessary to get a decent L/C ratio and tuning range on the HF
bands.  I've seen GDOs that are specifically designed for VHF and
UHF, and tho I haven't used one, I'd expect them to overcome that
problem.

73 de Mike W5VSI

On 7/30/2011 01:45, Richard Knoppow wrote:
>       Some of you know that I obtained the VHF "coil"
>   actually a hair pin through the kindness of a fellow on
> this list. My question is for others with the same meter.
> How much current is normal for hairpin to indicate? Mine is
> quite low and I think it quits oscillating below about
> 140mhz. That is the low frequency limit as given in the
> handbook so it might be normal. The hairpin appears to be
> perfect and the tube tests good, actually rather hot, on two
> different testers. So, I suspect this is normal but want to
> confirm that. The current indicated on the meter varies with
> different coils but is significantly higher on the next
> lowest one. Its curious that the output is lower at the low
> end of the band but that's true of all the coils.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
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-- 
Mike Manes    mrmanes at gmail.com     Tel: 303-979-4899
"Things should be made as simple as possible, but not more so."
A. Einstein