Hi,
DX engineering has several commercial products:
http://www.dxengineering.com/Sections.asp?ID=33&DeptID=17#Top
I also saw in a QST (sorry, don't remember which: I've been
re-reading QST's from the last few years) an IP driven RF controlled
remote. I suspect a lot more expensive, but it had a range of several
hundred feet.
Regards,
kurtt
Kurt Pawlikowski, AKA WB9FMC
The Pinrod Corporation
[email protected]
(773) 284-9500
http://pinrod.com
On 12/17/2010 14:50, Alan Bloom wrote:
> Many years ago I built a remote antenna switch that allowed feeding up
> to 4 antennas from the same feedline. The feedline also was used for
> the control signal, so no additional wires were needed.
>
> It was a very simple circuit. The switch box at the top of the tower
> contained 5 coax connectors, two DPDT relays, two diodes, an RF choke
> and a couple capacitors. The control box in the shack contained 2 coax
> connectors, a 60-Hz power transformer, a 4-position switch, an RF choke,
> two diodes and a couple capacitors.
>
> The schematic is at http://www.cds1.net/~n1al/ham/ant_switch.GIF
>
> The electrolytic capacitors in the switch box may not be needed,
> depending on the relays. I believe I used 0.1 uF for the coupling and
> bypass capacitors something like 22 or 47 uH for the RF chokes. (A
> smaller choke might be required for VHF.) The transformer was chosen to
> provide the correct relay voltage. You may need to add resistors in
> series with the relay coils to fine-tune the voltage.
>
> Al N1AL
>
>
> On Fri, 2010-12-17 at 07:48 -0800, Jobst Vandrey wrote:
>> A small board to insert 12 volts DC on the Coax at the shack and a similar
>> board to pick it up at the antenna end to run relays or power remote tuners
>> without impacting the RF carried on the coax. I really do not want to run a
>> second set of cables just for this purpose. It would be great if it was
>> configured with some more or less standard DPDT relay positions (optional of
>> course) that could be populated as needed by the user to meet various
>> switching needs.
>>
>> MFJ does offer such a beast (4116 and 4117 without the relays) - but I admit
>> to some significant uncertainty in the quality of the design and the of the
>> components used in the manufacturing.
>>
>> Jobst Vandrey
>> AC0LP
>>
>>
>>
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