[Antennas] [CQ-Contest] Wireless Remote Control Relays

Thu Feb 14 14:47:41 EST 2013

Dick,
Yes, all systems of this sort use DC injection onto the feedline center 
doncuctor through an RF choke at the shack end and extract the DC at the 
switch end via another RF choke.
At the same two locations the RF is passed through a series capacitor in 
line with the feed line. The caps block the DC from the antenna at the 
switch end and from the RX input at the shack end.
de Milt, N5IA
-----Original Message----- 
From: Edward Dickinson III
Sent: Thursday, February 14, 2013 10:53 AM
To: whitaker at ieee.org ; antennas at mailman.qth.net
Subject: Re: [Antennas] [CQ-Contest] Wireless Remote Control Relays
I can see some benefit in operating a remote switch using 12 Volts Wireless
Relay by using Voltage injected on a coaxial feedline. Such a system is
offered by MFJ using a module at either end of the coax.
A question comes to mind.
* Does the module to pick up 12 Volts at the Switch End of the coax,
then remove the 12 Volts and keep it from passing through the (coaxial)
the switch/relay assembly?
* If not, how does one operate into a DC grounded antenna without
shorting the 12 Volt supply?
Dick - KA5KKT
-----Original Message-----
From: antennas-bounces at mailman.qth.net
[mailto:antennas-bounces at mailman.qth.net] On Behalf Of C.Whitaker
Sent: Thursday, February 14, 2013 11:40 AM
To: antennas at mailman.qth.net
Subject: Re: [Antennas] [CQ-Contest] Wireless Remote Control Relays
de WB2CPN
Something to think about, but the most reliable design of remote antenna
switching systems are based on a stepped rotary switch. They can be
operated to step from one position to another easily. They can be programed
if the switch has an extra set of contacts for feedback, (switch position),
and before electronic telephone line switching was invented, they were the
heart of the step-by-step telephone systems.
They can be used on high power if the controlled switch is a small one which
in turn operates a very large switch.
Let's hear your workshop noises, guys.
73 Clete
++++++++++++++++++++++++++++++++++++++
On 2/13/2013 5:45 PM, Milt -- N5IA wrote:
> Thanks Gary for that information. It is the first of this kind I have
seen. Pete, N4ZR has reverse engineered the board and has produced a
similar instruction. From the info from the two sources, I can probably get
something to work.
>> The 8 relay board is not now available as you can see in the E-Bay notice.
However, the 4 relay and 15 relay boards and remote controls made by the
same company appear to be available for purchase.
>> I can say that the boards and relays are high quality, and should be of
use to lots of folks who might want to put a small amount of work into them.
>> Pete has an article in the NCJ about one year ago that details what he has
done to use his 8 relay board remotely, including inducing the 310 MHz RF
signal onto his feed line to get more distance to his antenna selection
location.
>> Thanks again, and good luck to anyone who tackles the project.
>> de Milt, n5Ia
>>> From: Gerry Hull
> Sent: Wednesday, February 13, 2013 2:47 PM
> To: Milt -- N5IA
> Cc: topband at contesting.com ; cq-contest at contesting.com ;
> Antennas at mailman.qth.net
> Subject: Re: [CQ-Contest] Wireless Remote Control Relays
>> They are probably the nearly the same as this:
> http://www.ebay.com/itm/130545242235?ssPageName=STRK:MEWNX:IT&_trksid=
> p3984.m1439.l2649
>> A mau
>>> On Tue, Feb 12, 2013 at 7:19 PM, Milt -- N5IA <n5ia at zia-connection.com>
wrote:
>> A question to the informed masses.
>> A year or so ago I purchased some wireless remote control, 8 relay,
modules from some source on E-Bay.
>> Obviously at the time the units appealed to me, and apparently the
price was right because I purchased 10 of them.
>> Well, they have sit in the USPS shipping box for this length of time
and I am now trying to figure out what project I had in mind for them; and
how to use them.
>> SOOOOOOOOOOO................
>> Does anyone have any experience with these units which have a sole
identifying mark, silk screened on the RX and relay board, of CDKZQ-8L. The
manufacture date is 2011年10月04日.
>> These units apparently work on 310 MHz. The only result I get in a web
search is a Linear Delta Remotes company. But nothing they show for
products resembles these units.
>> The tiny remote control transmitter has larger, red colored keys
numbered 1 & 2, and 3-8 on smaller black colored keys. It has a small
telescoping antenna.
>> These units are very well constructed, operate at 12 VDC, and look to
be SPDT relays with 3 connections per relay on the terminal boards.
>> Does anyone out there know anything about this unit; in particular how
to program the channels for control of the eight relays?
>> For anyone wanting to see them, respond directly to me and I will send
you a couple of jpeg images.
>> Thanks in advance for any assistance that can be offered.
>> 73 de Milt, N5IA
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