Hi Jim,
Transco also makes a single pole high isolation 4 position switch with
construction similar to the Transco "Y" relay. It is sometimes referred to
as a Porcupine (after the animal). It looks like a large golf ball with
many connectors and solenoids protruding in all directions. It has
performance similar to the "Y" type relays. I have used them on my VHF/UHF
tower to switch between antennas up through 2300 MHz. However, you must
make your own switching box.
73,
Joe, W1JR
At 09:49 AM 8/10/2002 +0200, Jan Erik Holm wrote:
>Don´t forget the German HOSCHA switch.
>I have a Hoscha 2000 switch that measures:
>30 MHz 42 dB return loss, isolation 54 dB
>145 MHz 35 dB return loss, isolation 41 dB
>435 MHz 35 dB return loss, isolation 35 dB
>Insertion loss 0.03 dB or better.
>Will handle very high power and the cost is
>around 200 dollars.
>Does dow-key/Transco really have remote
>rotary switches with that huge isolation.
>The only Transco relay I know of with that
>high isolation is their SPDT koax relay, well
>it´s sort á SPDT really.
>
>73 Jim SM2EKM
>
>PS: Hoscha 2000 is 5 position remote motor driven switch.
>-------------------------------------------------------------
>
>Steve Katz wrote:
>
>>The only remote antenna switches I know of that actually "work" at UHF are
>>the Dow-Key/Transco types, which I've used with great success for many
>>years. The "M" series products have 0.05dB attenuation and 100dB isolation
>>at 100 MHz, but are rated to operate through 12.4GHz, and are available in
>>SP3T through SP6T models, all Type N connectors, all completely
>>weatherproof, with various actuator voltage ratings from 28Vdc through
>>120Vac. They easily handle 1500W PEP, and are constant impedance through at
>>least 3GHz. Although I buy mine surplus, they are still manufactured and
>>readily available, pretty much "off the shelf" from Dow-Key, locally to me
>>in Ventura, CA. http://www.dowkey.com
>>
>>73 de Steve, WB2WIK/6
>>
>>
>>>At 10:21 8/9/2002 -0400, Mel Martin wrote:
>>>
>>>>Does anyone know of a remote antenna switch that works at VHF/UHF?
>>>The Ameritron RCS-8V is rated :
>>>
>>>VSWR is less than 1.2 from DC to 250 MHz and less than 0.1 dB loss at
>>>150 MHz - It handles 5 KW below 30 MHz and 1 KW at 150 MHz. The manual
>>>also states "only a slight compromise in VSWR occurs at 450mhz.
>>>
>>>The switch is also available as the RCS-8VN with N connectors.
>>>
>>>73 Phil NA4M
>>>
>>>
>>>-. .- ....- -- -. .- ....- -- -. .- ....- -- -. .- ....- -- -.
>>>.- ....- --
>>>Phil Duff NA4M na4m@arrl.net Georgetown, Texas
>>>
>>>
>>>_______________________________________________
>>>Self Supporting Towers, Wireless Weather Stations, see web site:
>>>http://www.mscomputer.com
>>>Call 888-333-9041 to place your order, mention you saw this ad and take an
>>>additional 5 percent off
>>>any weather station price.
>>>_______________________________________________
>>>Towertalk mailing list
>>>Towertalk@contesting.com
>>>http://lists.contesting.com/mailman/listinfo/towertalk
>>_______________________________________________
>>Self Supporting Towers, Wireless Weather Stations, see web site:
>>http://www.mscomputer.com
>>Call 888-333-9041 to place your order, mention you saw this ad and take
>>an additional 5 percent off
>>any weather station price.
>>_______________________________________________
>>Towertalk mailing list
>>Towertalk@contesting.com
>>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
>_______________________________________________
>Self Supporting Towers, Wireless Weather Stations, see web site:
>http://www.mscomputer.com
>Call 888-333-9041 to place your order, mention you saw this ad and take an
>additional 5 percent off
>any weather station price.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
|