Dwight,
Correction, I should have said 0 volts over the control line (not feedline)
selects one pennant, +12 volts selects the second pennant, and -12 volts
(just reversing polarity of the power supply connected to the control line)
selects the 3rd pennant.
Don
On Wed, Aug 20, 2014 at 7:11 AM, Don Kirk <wd8dsb@gmail.com> wrote:
> Hi Dwight,
>
> I have 3 point fed pennants that share the same feedpoint and use only one
> BN-73-202 Binocular Core Transformer matching transformer at the feedpoint
> (one pennant pointing 40 degrees, one pointing 160 degrees, and one
> pointing 300 degrees) and have been using this system for over 3 years now
> with no problems. I use two relays (located at the common center location
> of the pennants to select the active pennant, and disconnect both sides of
> the pennants that are not active from the matching transformer.
>
> Switching 3 pennants is very easy as it only requires one isolated 12 volt
> supply and a two conductor control cable from the shack out to the relay
> box which is located at the feedpoint. 0 volts over the feedline selects
> one pennant, +12 volts selects the second pennant, and -12 volts (just
> reversing polarity of the power supply connected to the control line)
> selects the 3rd pennant.
>
> Here is a link to a simple website I have that documents my 3 pennant
> system, and you can see a picture of the inside of my relay box on this
> website.
> http://sites.google.com/site/pennantflagantennas/
>
> Simple and see no reason to do it any other way if using 3 pennants that
> have a common center point location.
>
> 73,
> Don
>
>
>
> On Tue, Aug 19, 2014 at 7:59 PM, Tom W8JI <w8ji@w8ji.com> wrote:
>
>> I would not switch high impedance lines without very special precautions.
>>
>> I really do not think it is worth the small parts savings.
>>
>> ----- Original Message ----- From: "DGB" <ns9i2016@bayland.net>
>> To: <topband@contesting.com>
>> Sent: Tuesday, August 19, 2014 4:38 PM
>> Subject: Topband: Switching Pennants
>>
>>
>> I am wanting a simple way of switching 3 or 4 pennants. Anyone done this?
>>>
>>> Quote From K6SEE ... All four Pennants would be installed with their
>>> points all adjacent to each other. Only one feedline would be necessary
>>> and only one
>>> transformer would be necessary, with the high impedance winding of the
>>> transformer being switched to the feedpoint of the Pennant in the desired
>>> direction ... 73, de Earl, K6SE
>>>
>>> 73 Dwight NS9I
>>> _________________
>>> Topband Reflector Archives - http://www.contesting.com/_topband
>>>
>>>
>>> -----
>>> No virus found in this message.
>>> Checked by AVG - www.avg.com
>>> Version: 2014.0.4745 / Virus Database: 4007/8063 - Release Date: 08/19/14
>>>
>>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>
>
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|