Topband: switch for RX antennas

[Herb Schoenbohm]

Jorge Diez - CX6VM wrote:
>
>  
>
>  I am looking for a way to have a switch that can be connected to the AUX RF
> and allows me to switch between many RX antennas.
> Or better than that, something that allow me to spare RX antennas between
> main (RX ANT IN) and sub (AUX RF) receivers in a radio like the K3.
> I know there´s many stations with a lot of beverage antennas. But seems all
> of them build they own switches. 
> I cannot do that, so will appreciate if someone can tell me if it´s
> available a commercial solution for that.
>
>  
>
>   
Jorge,


I used here the Dynair push button video switches that are used in TV 
stations to switch video or monitors to different 75 ohm source 
material. I currently have in the RX line a 12X1.  Nice thing about the 
Dynair is that it has great port to port isolation, uses PL-259 
connections (I use BNC  or F to PL-259 adapters), and terminates each 
unused port with a 75 ohm resistor.  I had a pile of them here and sold 
them on e-Bay. Most upgraded TV stations are using electronic switching 
today so they should be readily available for next to nothing.  I  just 
bought a 3X1 Dynair on eBay for $22.00 US which I will use to route 
several antennas to my MFJ-1026 phaser/noise canceler.

You should be able to find them on eBay for a reasonable price.  Some of 
them even have active switch lamp illumination but I have not found that 
is required.  I also think that DXE has a multi port switch that allows 
for termination of unused ports but it is much more expensive than a 
surplus TV-passive switch like the Dynair.  You might also check with 
local TV station and see if they have one they are not using.


Herb Schoenbohm, KV4FZ