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Swr problem on 102" whip

Riverman

Old Member
Nov 12, 2013
2,668
2,657
273
Once the plastic insulator is properly seated, I don't think he'll ever get an acceptable SWR without some sort of counterpoise, whether it be four wire radials or just one. Unless he attaches the steel whip to a Chevy. Or a metallic roof. Something.
 

G-Golly Wally

WDX 719 SE Oklahoma
Nov 5, 2008
229
550
103
Southeastern Oklahoma
Once the plastic insulator is properly seated, I don't think he'll ever get an acceptable SWR without some sort of counterpoise, whether it be four wire radials or just one. Unless he attaches the steel whip to a Chevy. Or a metallic roof. Somethi

I suggested that way back in Post #22, but it was "freezing and dark" outside. LOl....lol...lol.
When I used my 102 as a ground plane, I had the whip with no spring and 3 radials. If I remember right I made the radials longer than 102 inches and had to shorten them for the best swr reading. I was able to get 1 to 1.5 swr across all 40 channels. It may have been dumb luck, idk? But it worked really well for me.
 

Dannell Boyd

New Member
Nov 15, 2021
23
22
3
69
Magnolia, MS
Once the plastic insulator is properly seated, I don't think he'll ever get an acceptable SWR without some sort of counterpoise, whether it be four wire radials or just one. Unless he attaches the steel whip to a Chevy. Or a metallic roof. Something.
Hello riverman, I'm going to take you guys advice and ditch the spring and build some radials also going with a different 239. I'm going to come off the bracket with the radials. Is it ok to use stranded 12 ga. Wire with insulation or do I need bare wire. Thanks, Dannell. South MS.
 

Crawdad

Down in the mud invasive species
Nov 11, 2016
818
1,700
153
I'm going to come off the bracket with the radials. Is it ok to use stranded 12 ga. Wire with insulation or do I need bare wire. Thanks,

Dannell,
Insulated 12 ga. stranded wire will be just fine. Doesn't have to be bare wire. Just try to make sure the connections are solid to allow the RF to freely flow back to your radio.

73
 

BJ radionut

Supporting Member and 6m addict
May 9, 2008
4,146
4,682
373
35 miles East of Indianapolis
65911767700c8c92a71f41880f06c502.jpg
 

Riverman

Old Member
Nov 12, 2013
2,668
2,657
273

Was wondering when you were going to show up with that. :giggle:
That is, of course, what I am using right now albeit with just one wire radial. Have also used 4’ Firestiks. One for the vertical and two for radials (2). That worked good too. The possibilities are endless. (y)
 
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Dannell Boyd

New Member
Nov 15, 2021
23
22
3
69
Magnolia, MS
What was the SWR after removing the spring?
PXL_20220126_225239325.jpg
hello everyone, removed the spring, installed different so-239 and 2 radials and I now have 1.4 SWRs on 1/20/40. I never could hear so many truckers before on the interstate, 8 miles away. I asked for a radio check, and got a answer said they could hear me good. So thanks everyone for the help.
 

Crawdad

Down in the mud invasive species
Nov 11, 2016
818
1,700
153
Well done Dannell. If you can find a way to get one or two more radials installed your antenna will be even more efficient and a bit more omnidirectional. If not, congrats and enjoy. Welcome to homebrewed antennas!

73
 
Last edited:

Riverman

Old Member
Nov 12, 2013
2,668
2,657
273
View attachment 56833
hello everyone, removed the spring, installed different so-239 and 2 radials and I now have 1.4 SWRs on 1/20/40. I never could hear so many truckers before on the interstate, 8 miles away. I asked for a radio check, and got a answer said they could hear me good. So thanks everyone for the help.

Outstanding. (y):giggle:
 

G-Golly Wally

WDX 719 SE Oklahoma
Nov 5, 2008
229
550
103
Southeastern Oklahoma
Good deal (y)
I didn't think of it until just now, but if you get on Utube there's a guy that goes by Mower Junkie that's always experimenting with home brew antennas. He does a good job of showing you how he goes about his builds. I actually have intentions of building one of his antennas. You might check him out, he has some interesting stuff.
 
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  • @ BJ radionut:
    2022 Aug 08 0839 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1656 Valid From: 2022 Aug 07 1428 UTC ... Now Valid Until: 2022 Aug 08 1500 UTC ...Warning Condition: Persistence
  • @ BJ radionut:
    Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
  • @ BJ radionut:
    A Index = 24:mad: almost Blackout level...sig/noise ratio F'd up