Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Christman Feed Question?  (Read 1656 times)
NK7Z
Member

Posts: 865


WWW

Ignore
« on: May 23, 2013, 08:45:45 AM »

Hi,

I am constructing a 40 Meter phased vertical array...  Anyone know where I could get a relay for this, (SPDT), in the 1.5 KW lever...  I have a DOW that looks to be up to the job...  Any thought on that?  If the DOW is used, I'd get a T on the output of each end, for the 71 degree phasing line.
Logged

Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
KD8GEH
Member

Posts: 476




Ignore
« Reply #1 on: May 23, 2013, 09:58:49 AM »

Look at JTE's nethod. He uses Rat shack relays no prb.  I talk to him all the time and they work quite well.

http://www.eham.net/articles/26865

This is on my lisy to try this weekend.

73  Dave  KD8GEH
Logged
NK7Z
Member

Posts: 865


WWW

Ignore
« Reply #2 on: May 23, 2013, 01:10:19 PM »

Look at JTE's nethod. He uses Rat shack relays no prb.  I talk to him all the time and they work quite well.

http://www.eham.net/articles/26865

This is on my lisy to try this weekend.

73  Dave  KD8GEH
Thank you sir!!
Logged

Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
N4JTE
Member

Posts: 1158




Ignore
« Reply #3 on: May 23, 2013, 05:41:38 PM »

Tnx Dave but to the poster of the question, you need a DTDP relay, $8 at rat shack.
Bob
Logged
KB4QAA
Member

Posts: 2445




Ignore
« Reply #4 on: May 23, 2013, 08:22:23 PM »

Dow-Key relays are intended for short/brief closure only.   If you use them in continuous closure use the coil will burn up.  I've seen lamentations from hams who tried to use them as antenna selector switches inside the shack.

Logged
NK7Z
Member

Posts: 865


WWW

Ignore
« Reply #5 on: May 24, 2013, 12:05:26 AM »

Tnx Dave but to the poster of the question, you need a DTDP relay, $8 at rat shack.
Bob
Hi Bob, I was the poster...  Why DPDT?  I was going to use a common ground... What am I missing.
Logged

Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
NK7Z
Member

Posts: 865


WWW

Ignore
« Reply #6 on: May 24, 2013, 12:17:49 AM »

Dow-Key relays are intended for short/brief closure only.   If you use them in continuous closure use the coil will burn up.  I've seen lamentations from hams who tried to use them as antenna selector switches inside the shack.



I had no idea about that...  THANK YOU for the info!!!
Logged

Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
KD8GEH
Member

Posts: 476




Ignore
« Reply #7 on: May 24, 2013, 08:28:13 AM »

Thanks Bob!  Almost but no cigar.

Sheesh, ur always watching over me!  Roll Eyes  BTW, can you run a KW thru the rat shack special relay?

See you on the bands this weekend. Maybe get YY in there tow and have a party WOOT!

73  Dave KD8GEH
Logged
N4JTE
Member

Posts: 1158




Ignore
« Reply #8 on: May 24, 2013, 01:05:09 PM »

Hi Dave, never had any problem with 800 watts, should be fine at a thousand as long as you dont hot switch between directions.
Also, the grounds can not be common as both antennas must have isolated feedlines in order to maintain the phase.
However it is critical that all connections are maintained for polarity, in other words, all the sheilds and neg 12v are on one side of relay and positive on the opposite side, good luck.
Bob
Logged
NK7Z
Member

Posts: 865


WWW

Ignore
« Reply #9 on: May 24, 2013, 01:33:06 PM »

Hi Dave, never had any problem with 800 watts, should be fine at a thousand as long as you dont hot switch between directions.
Also, the grounds can not be common as both antennas must have isolated feedlines in order to maintain the phase.
However it is critical that all connections are maintained for polarity, in other words, all the sheilds and neg 12v are on one side of relay and positive on the opposite side, good luck.
Bob
Could you shoot me a link to something that expands on that a bit...  I have a lot of Christman feed stuff, and it shows common grounds...  I want to get to the bottom of that prior to construction.  Now that I have heard it from you, I will change things around to a DPDT relay...  That way I am covered either way...  I see what you are saying about keeping things on the same side of the relay...  Smiley
Logged

Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!