[CQ-Contest] Bandpass filter
w2up at comcast.net
Thu Jul 5 04:26:14 PDT 2012
I used off-the-shelf Top Ten Devices boxes. It didn't require any
custom design from them. To get the band decoders to switch multiple
devices (stubs, bandpass filters and antennas) in a neat way, I used old
computer A/B/C boxes with DB-25s on them. I ripped out the switches and
wired them so that the band decoder output would go to all 3 connectors,
in parallel, and switch everything together, using DB 25 cables with
the connector cut off one end, going to the relay boxes.
On 7/4/2012 8:36 PM, Timothy Coker wrote:
> There is a good article that was published in NCJ... K6LA paid Top Ten
> Devices to make such a thing for his QTH. The article is available for
> reading on Top Ten's website.
> Tim /N6WIN
> On Jul 4, 2012 7:15 PM, "Gary Sutcliffe" <w9xt at unifiedmicro.com> wrote:
>> Has anyone built a switching stub box for multi-band operation that
>> switches in the proper stubs for the current band? Any issues or things
>> to watch out for?
>> Gary, W9XT
>>> 15m stub system that rejects 20m provides this feature.
>>> K2TR recipe via K1TTT web says a 23' piece of RG213 as a shorted stub
>>> stops 10&20m; passing 15m.
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