Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old April 30th 06, 02:26 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
Posts: n/a
Default TT-247 and 102 whip for mobile antenna ? testing

Buck wrote:
Today, if I don't get called into work, I plan to cut the wire next to
the antenna mount and install an SO-239 so I can wire the tuner
directly to the antenna or connect the coax to run to the front of the
van where I have the radio mounted.


SGC recommends that no transmission line be used between the
tuner and the antenna because of arcing. Consider that to
force just one watt into a CB whip on 4 MHz, EZNEC says it
takes over 1700 volts.
--
73, Cecil http://www.qsl.net/w5dxp
  #2   Report Post  
Old April 30th 06, 03:55 PM posted to rec.radio.amateur.antenna
Buck
 
Posts: n/a
Default TT-247 and 102 whip for mobile antenna ? testing

On Sun, 30 Apr 2006 13:26:10 GMT, Cecil Moore
wrote:

Buck wrote:
Today, if I don't get called into work, I plan to cut the wire next to
the antenna mount and install an SO-239 so I can wire the tuner
directly to the antenna or connect the coax to run to the front of the
van where I have the radio mounted.


SGC recommends that no transmission line be used between the
tuner and the antenna because of arcing. Consider that to
force just one watt into a CB whip on 4 MHz, EZNEC says it
takes over 1700 volts.



Interesting. Thanks.

I am still testing. I tested with coax and the result is that the
antennas designed for a given frequency work much better on their
frequencies. I am looking for my soldering kit now for the
connectors.

I may try a direct connection to see what happens without coax if I
can.

back in a few.

n4pgw

--
73 for now
Buck
N4PGW
  #3   Report Post  
Old May 1st 06, 01:34 AM posted to rec.radio.amateur.antenna
CW
 
Posts: n/a
Default TT-247 and 102 whip for mobile antenna ? testing

I'd have never guessed.

"Buck" wrote in message
...


I tested with coax and the result is that the
antennas designed for a given frequency work much better on their
frequencies.



  #4   Report Post  
Old April 30th 06, 05:29 PM posted to rec.radio.amateur.antenna
Buck
 
Posts: n/a
Default TT-247 and 102 whip for mobile antenna ? test complete

I just finished testing my antennas. The result is that the
whip/tuner combination is unacceptable.

I took the coax off the ball mount and ran short wires, about 6 inches
from the center lead of the ball and from the ground screw at the ball
inside the cab of the van and ran them to the appropriate connectors
on the tuner. I then tested 75, 40, and 20 meters.

The test results were that I made no contacts on 75. The only thing I
heard was a very slow and long monolog on 3872 by some man who seemed
more to be broadcasting than talking to another individual. I waited
over ten minutes to see if he would break or identify, but he did
neither. I went to 3.915 and heard two stations go QRT, but received
no response when I called. I didn't have another antenna worth
testing on 75 so that concluded my 75 meter test. Results: NO JOY!

I went to 40 meters where I heard some conversations. It tuned up
more easily than on 75, but no one answered my calls. I swapped to
the 40 meter AS antenna and the stations I heard went from no signal
on the scale to over s-9. That was enough to resolve that test.
Results: NO JOY!

I went to 20 meters where I had more success. I talked to Jim on the
county hunter's net with the whip antenna. He was the only station I
was hearing at the time. I swapped to the 20 meter AS antenna and his
signal strength went from s-2 to s-9. Also, I was able to hear the
mobile that was running. Results: NO JOY!

I hooked the coax back up, setup the 20 meter AS antenna and tuned it
from the front of the car. I will not be drilling a hole and
rearranging all the roof antennas for the whip. I will rather focus
my attention on getting the rest of the parts of my screwdriver
together after I get paid next week and see if I can install it.

Thanks for all the comments.

If nothing else, all this testing did reveal a bad ground connection
from the coax to the cab of the van. It is now fixed.

73 for now.


--
73 for now
Buck
N4PGW
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT +1. The time now is 11:01 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017