1978Blazerk5
1/2 ton status
If you got a bumper mounted whip mounted on a K5 Bumper Post up some pics trying to get some ideas for my 78'.
Thanks
Thanks
CK5
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Whip Antenna
- Thread starter 1978Blazerk5
- Start date
pauly383
Daddy383
Take a pic of Blazer , and draw a straight line on it 
1978Blazerk5
1/2 ton status
HA
no i didnt include enough info on a bumper bracket
no i didnt include enough info on a bumper bracket
jonathon
1/2 ton status
I know this doesn't help but I was given a 10 foot metal whip and I plan on putting it on my blazer.. going to mount it on the front fender I think, if there's enough wire left on it to tune it that is...
pauly383
Daddy383
to tune a whip antenna to middle of CB band is easy :
the half wave equation is 468/frequency ( use 27.185 for channel 19 ) , which gives you 17.21 and then some . Well divide that in half ( quarter wave ) and get 8.60 and then some .
So the whip length ( include the spring ) is about 103.20 to be perfect in the middle of the band .
your ten foot whip will be WAAAAAAAY to long at 120 inches .
the half wave equation is 468/frequency ( use 27.185 for channel 19 ) , which gives you 17.21 and then some . Well divide that in half ( quarter wave ) and get 8.60 and then some .
So the whip length ( include the spring ) is about 103.20 to be perfect in the middle of the band .
your ten foot whip will be WAAAAAAAY to long at 120 inches .
1978Blazerk5
1/2 ton status
I was gonna do a 108 plus what ever the spring is.
pauly383
Daddy383
And you will still be too long , I didn't make the rules , mother nature did 
1978Blazerk5
1/2 ton status
Really,? my Buddy has one mounted on his truck and has never had a problem.
IDK i have heard alot of Crap about a 102 inch
IDK i have heard alot of Crap about a 102 inch
pauly383
Daddy383
The radio may still work , but you won't get the maximum power output , some radios will not care if the SWR is too high , some will throttle back to litlte output .
Too long and works better on the beginning of the band , too short and it works better on the end of the band .
Just right , and it works best on the middle , with not too much drop on each band end .
Too long and works better on the beginning of the band , too short and it works better on the end of the band .
Just right , and it works best on the middle , with not too much drop on each band end .
jonathon
1/2 ton status
Well that only makes too much sense
I would've found out the hard way putting it in and then measuring SWR.
You can ball mount it as well................though I tore this one off at Tellico, easily replaced now!
Here's the way I mounted mine. I made up a bracket that bolts to the inside of the tailgate jamb. The antenna is not hanging on the side to get snagged by trees. It works pretty good, no flex issues at all.
I was able to route the antenna cable through a hole I made behind the tail light. I put a notch in the tail-light housing to allow the cable to pass by without getting pinched when I put the light back in.
I was able to route the antenna cable through a hole I made behind the tail light. I put a notch in the tail-light housing to allow the cable to pass by without getting pinched when I put the light back in.
1978Blazerk5
1/2 ton status
You can ball mount it as well................though I tore this one off at Tellico, easily replaced now!
i really dont wanna drill holes in the body. bumpers fine but body no
1978Blazerk5
1/2 ton status
Here's the way I mounted mine. I made up a bracket that bolts to the inside of the tailgate jamb. The antenna is not hanging on the side to get snagged by trees. It works pretty good, no flex issues at all.
I was able to route the antenna cable through a hole I made behind the tail light. I put a notch in the tail-light housing to allow the cable to pass by without getting pinched when I put the light back in.
thats a neat idea
1978Blazerk5
1/2 ton status
anyone else.
for my truck i was gonna do the whip and then a rain gutter clip
for my truck i was gonna do the whip and then a rain gutter clip
I had the same feeling as you. I didn't want to drill into the quarter panel. Not because it was nice, but more that I know my quarter panel is 90% bondo from a previous owner's repairs. I made the bracket out of 1/8th inch steel used for landscape edging. I bent it up on a bench vice. The center bolt used to attach the bracket to the jamb is already there and threaded. If I'm not mistaken that's the hole used to install the striker stud if you were running a pickup style tailgate. The other two holes I drilled after I bolted it in with the center bolt. Those are 1/4" diameter bolts with nuts on the inside to hold them. With the tail light housing removed you can reach up to hold the nuts to start the bolts. I've got big hands and I was still able to reach it with my fingers.
Once I had it bolted in (and the tail light housing was still out) I drilled a 3/4" hole that reaches into the rear cargo area. I installed a grommet and ran the coax through. I did scuff the surfaces of the bracket where the antenna (aluminum) bracket bolted and on the body for good grounds. My SWR didn't change if I grounded it externally or not. My SWR topped out at 1.9 on 40, but was as low as 1.2 at channel 1. Running a 5 ft fiberglass (non-easy adjustble firestick type) whip on a potbelly spring. I think I need to cut some of the copper to lower the SWR more.
As far as how it works on the trail, it's great. The potbelly spring takes all the movement and transmits little to no movement into my home fabbed bracket. It's been over some rough trails in Colorado and the bracket never tweaked. Trees did snag the antenna, but the spring allowed it to move. For nothing more than time invested I think it did what I wanted it to do.
Once I had it bolted in (and the tail light housing was still out) I drilled a 3/4" hole that reaches into the rear cargo area. I installed a grommet and ran the coax through. I did scuff the surfaces of the bracket where the antenna (aluminum) bracket bolted and on the body for good grounds. My SWR didn't change if I grounded it externally or not. My SWR topped out at 1.9 on 40, but was as low as 1.2 at channel 1. Running a 5 ft fiberglass (non-easy adjustble firestick type) whip on a potbelly spring. I think I need to cut some of the copper to lower the SWR more.
As far as how it works on the trail, it's great. The potbelly spring takes all the movement and transmits little to no movement into my home fabbed bracket. It's been over some rough trails in Colorado and the bracket never tweaked. Trees did snag the antenna, but the spring allowed it to move. For nothing more than time invested I think it did what I wanted it to do.
1978Blazerk5
1/2 ton status
Pauly, you were saying 108 inch plus spring is to long, what about a 102 plus spring?
1978Blazerk5
1/2 ton status
I'll drill 'em for ya............come on by!
To Carolina, Road trip lol
here's my 102" SS mounted to my rear bumper... I just drilled a hole, put the mount in and tightened the nut down on the other side... then the coax cable threads in from the bottom and the 102" whip threads in from the top...
The third pic shows my cb mounted... the brackets that come with the Uniden CB's align perfectly with some factory holes below the ash tray... the transfer case shifter handle hits the cb so I machnied a shorter handle to go in its place...
The third pic shows my cb mounted... the brackets that come with the Uniden CB's align perfectly with some factory holes below the ash tray... the transfer case shifter handle hits the cb so I machnied a shorter handle to go in its place...
