Topband: Video Switch for Low Band Antenna switching

[Herbert Schoenbohm]

The early Dynair switches are passive and they only require pushing in 
the old fashion PB snap switches.  The only voltage they use (optional) 
is for switch illumination which was required to show with video monitor 
was connected to a particular source in a darkened control room.  I 
removed all wiring and the 12v supply since it is easy to see in front 
of me which RX antenna is selected.  My only complaint is that during a 
contest one hand (also the one I send CW with) is constantly changing 
antennas.  The design by Gary with the momentary pad is a big 
improvement especially if it has a computer interface selection for 
remote operating.  Right now I can only switch 6 antennas by the remote 
op on the mainland by using IP Power and a bunch of relays in 
conjunction with a DX-Engineering RTR-1

Herb Schoenbohm, KV4FZ



On 7/5/2015 6:17 PM, Roger D Johnson wrote:
> It appears that the better video switches need a signal from the 
> vertical blanking interval to switch. No
> signal, no switching. Probably explains why they are so cheap on eBay!
>
> I have 3 bi-directional Beverages, an 8 circle and 4 square receiving 
> antennas. I would like to switch
> any one to my K3 main rx, K3 aux rx, R-388 or DX Engineering NCC-1 
> phasing box. That's 8 inputs
> and 4 outputs minimum.
>
> Ideally, some sort of matrix arrangement would do. I've looked far and 
> wide for a commercial unit that
> would do the job but no luck. Virtually everything is designed for 
> SO2R operation. At present, I'm using
> a switcher used in RV units. It has 5 inputs and 3 outputs. I use a 
> separate switch for Beverage selection.
>
> Thanks for all the inputs!
>
> 73, Roger
>
>
> On 7/4/2015 21:47, Roger D Johnson wrote:
>> I've been looking for a way to switch multiple receiving antennas to 
>> multiple receivers. I know some hams are
>> using video switchers but info on them is scarce. There is a Dynair 
>> SVA-100B for sale on eBay but no real description
>> of it's functions.
>>
>> It seems obvious that you can, for instance, switch input 3 to output 
>> 7 but can you simultaneously switch input
>> 5 to output 6? In other words, can you have more than one path 
>> through the switcher?
>>
>> Any other ideas on switching greatly appreciated!
>>
>> 73, Roger
>>
>>
>>
>>
>> <http://antiqueradios.com/forums/report.php?f=2&p=2337227>
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