[Fourlanders] 222 Bandpass filter needed

[Brian McCarthy]

I believe Robin, K4IDC, had quite some pile of 220 cavities that he was
trying to or helping to sell. I am not sure if any of those are still
available.

At Fair Radio they still have some of the F band dual cavities that should
be modifiable to 222.

See: http://www.fairradio.com/catalog.php?mode=viewitem&item=3872

They also have some Celwave 220 cavities.

See: http://www.fairradio.com/catalog.php?mode=viewitem&item=3886

I would be willing to donate toward whatever solution seems required.

Just my thoughts,
Brian
NX9O

On Tue, Nov 25, 2008 at 6:50 AM, Rogers, Ron <RR124640 at ncr.com> wrote:

> I don't know if I have anything here, Bob. But I will check.
> I will also research to see if there have been any articles published about
> 220 filters and cavities, as such.
>
> Or maybe find an old 140 - 150 MHz VHF cavity and see if it can be cut down
> to 220 size.  I'll bet even a tunable Hi-Q helical coil filter design would
> work for this situation.
>
> Ron
> WW8RR
>
> ________________________________
>
> From: fourlanders-bounces at contesting.com on behalf of Bob Lear
> Sent: Mon 11/24/2008 10:35 PM
> To: fourlanders at contesting.com; Gary Bailey
> Subject: [Fourlanders] 222 Bandpass filter needed
>
>
> This is regarding the recent problem with the WA4IOB 222 beacon which
> has been shut down since the spur problem.  I ran into Gary at the Stone
> Mountain hamfest and we discussed the situation.  He said a filter will
> probably solve the problem and he has a network analyzer with which to
> tune one if we can come up with a suitable filter for him.
>
> I thought I had one, but it turned out to be too high in frequency.  I'm
> still looking in the mess I'm making while moving and losing stuff left
> and right in boxes here and there!!  I did find some military 'D' Band
> dual tunable cavities that are for 400-450 and 450-500.  Gary said that
> type device would work if they cover the 220 band, but I know these I
> have aren't going to work at 222.  Does anyone on the Fourlanders list
> have something suitable?  I'll try here first and if we don't come up
> with something, I'll try the SVHFS list next.
>
> Thanks for checking.  Let me or Gary know what you have to help the
> situation.  We'd like to the the 222 beacon back on the air.
>
> 73, Bob
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