Topband: 75 ohm coax switch

[Tom W8JI]

In  the shack, some video switches are OK. Be careful. Many switches have 
active components and/or are pretty poor up high in frequency.

I'm not sure about modern manual CATV or MATV antenna switches, I've seen 
them up to 4 way years ago, and they are usually much better.

Personally, I use relays with a desk mounted control. Saves having multiple 
heavy wires on the desk.

160 is pretty forgiving for switch construction, provided the shields are 
all well grounded to a common shield plate. Do NOT switch the shields!! Just 
switch the centers.


----- Original Message ----- 
From: "Art Snapper" <art at nk8x.net>
To: "Tom W8JI" <w8ji at w8ji.com>
Cc: "160" <topband at contesting.com>
Sent: Monday, April 20, 2015 6:57 PM
Subject: Re: Topband: 75 ohm coax switch


> Thanks everone for the ideas. I hadn't thought of the Dynair video switch.
> Access to useful information is why I joined this group - and haven't been
> disappointed.
>
> Tom, receive switching will be in the shack. I have 4 antennas on the
> mechanical switch now, but anticipate 6 before winter or divorce. :)
>
> Art
>
>
> On Mon, Apr 20, 2015 at 5:37 PM, Tom W8JI <w8ji at w8ji.com> wrote:
>
>> Most TV switches work to DC, even if they say 5 MHz.
>>
>> There are many switches around. How many positions, and is this indoors 
>> or
>> outdoors??
>>
>>
>>
>> ----- Original Message ----- From: "Art Snapper" <art at nk8x.net>
>> To: "160" <topband at contesting.com>
>> Sent: Monday, April 20, 2015 12:05 PM
>> Subject: Topband: 75 ohm coax switch
>>
>>
>>  What do you use for switching your receive antennas?
>>>
>>> I have been adapting the RG-6's F connectors, to PL-259s to use a 
>>> regular
>>> ham coax switch.
>>>
>>> The 75 ohm (TV) type switches show a minimum frequency of 5MHz.
>>>
>>> Is there a better solution?
>>>
>>> Art NK8X
>>> _________________
>>> Topband Reflector Archives - http://www.contesting.com/_topband
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>
>
>
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