[Fourlanders] DCI Bandpass Filter - High Reflected Power

[Jim Worsham]

It isn't overly large and it has N connectors.

73
Jim, W4KXY

It doesn't matter how beautiful your theory is, it doesn't matter how smart
you are.  If it doesn't agree with experiment, it's wrong.
Richard P. Feynman
-----Original Message-----
From: rfacres at gmail.com [mailto:rfacres at gmail.com] On Behalf Of Brian
McCarthy
Sent: Wednesday, September 08, 2010 3:19 PM
To: wa4kxy at bellsouth.net
Cc: Fourlanders
Subject: Re: [Fourlanders] DCI Bandpass Filter - High Reflected Power

Thank you Jim, please. As long as it is not large or problematic to
pack. Do you happen to recall what connectors are on it?

Brian
NX9O

On Wed, Sep 8, 2010 at 3:14 AM, Jim Worsham <wa4kxy at bellsouth.net> wrote:
> I have a filter for 222 MHz that you can use.  It is a military surplus 2
> cavity job that was tuned on a network analyzer to 222 MHz.  I have never
> used it but it should do the job.  I will bring it to the mountain unless
I
> hear otherwise.
>
> 73
> Jim, W4KXY
>
> It doesn't matter how beautiful your theory is, it doesn't matter how
smart
> you are.  If it doesn't agree with experiment, it's wrong.
> Richard P. Feynman
> -----Original Message-----
> From: fourlanders-bounces at contesting.com
> [mailto:fourlanders-bounces at contesting.com] On Behalf Of Brian McCarthy
> Sent: Tuesday, September 07, 2010 9:27 AM
> To: Fourlanders
> Subject: [Fourlanders] DCI Bandpass Filter - High Reflected Power
>
> I know that we have had occasional problems with filters used for the
> contests. My DCI-223.5-3H has developed a problem. With 30 watts in at
> 222 MHz I get 10 watts returned. I have opened up the unit. I found no
> obvious problems. I closed it back up, but made sure to carefully
> clean the center contacts on the SO-239's (MEK and cotton swabs). No
> change. I guess I will open it up again and check for hairline
> fractures, or bring it to work where I can reheat the joints with one
> of the monster soldering irons.
>
> One added data point of information, I NEVER feed the output of the
> amp through the filter. I always use it between the transverter and
> the Lunar Link.
>
> Does anyone have any other suggestions?
>
> When we had trouble before with DCI filters, what were the failure modes?
>
> Does anyone have a similar filter appropriate for 222 MHz that I could
> conveniently borrow?
>
> Thank you!
> Brian
> NX9O
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