Advise on this jpole

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Advise on this jpole

Postby garny68 » Sat Oct 01, 2016 5:05 pm

Could someone give me some advice on tbis jpole
http://www.ebay.co.uk/itm/DELUXE-MODEL- ... 0898779511
Ive just recently bought a scanner after years away from having one and ive come across the baofeng uv5r thats very cheap so bought it to monitor ham chat but not having much luck with it in picking anything up.
Ive been to chirp csv generator site ive created a csf of north 70cm 2mtr repeaters and sent them to radio but not picking much up. In a week ive picked up just one side of a conversation.
So is that antenna crap or am i doing something wrong?
Im just scanning the 40 repeaters that are in the csv
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Re: Advise on this jpole

Postby m0lsx » Sat Oct 01, 2016 5:29 pm

Where are you what repeaters are you trying to hear? Also what frequencies are you inputting, is it, just the repeaters output or both input & output & are you also listening to simplex channels?
If you are trying to scan 20 channels with a UV-5R you are probably missing more than you are hearing.
The 5r is not a scanner, it is a transceiver. That is, it's a receiver & a transmitter. It is designed to have a number of channels in putted, but is not designed to scan them like a scanner.
The antenna you linked to could be good or it could be terrible. Folded dipoles made from ladder line are lovely antennas when made to the correct length for the ladder line used. But they are dependent upon builder, as the antenna needs to be resonant, that is made to the correct for that ladder line.
Where abouts is the antenna hung? I hang mine in the window if operating inside a building. Also what is your location like? as buildings, hills etc will all block signals.
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Re: Advise on this jpole

Postby garny68 » Sat Oct 01, 2016 5:47 pm

Hi thanks for reply
Im in preston lancs
Here is the contents of the csv i have sent to the radio.
Thres 43 frequencys so im only scanning the 43 channels saved to radio
ocation,Name,Frequency,Duplex,Offset,Tone,rToneFreq,cToneFreq,DtcsCode,DtcsPolarity,Mode,TStep,Skip,Comment,URCALL,RPT1CALL,RPT2CALL
0,GB3AS,145.6000,-,0.6,Tone,77,77,023,NN,FM,5.00,,,,,x,
1,GB3CA,433.3250,+,1.6,Tone,77,77,023,NN,FM,5.00,,,,,x,
2,GB3CD,145.6875,-,0.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
3,GB3DV,433.0250,+,1.6,Tone,71.9,71.9,023,NN,FM,5.00,,,,,x,
4,GB3EV,145.7000,-,0.6,Tone,77,77,023,NN,FM,5.00,,,,,x,
5,GB3FC,430.8500,+,7.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
6,GB3GD,145.6250,-,0.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
7,GB3HA,145.7500,-,0.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
8,GB3HD,433.2250,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
9,GB3HG,145.6250,-,0.6,Tone,88.5,88.5,023,NN,FM,5.00,,,,,x,
10,GB3HJ,433.0250,+,1.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
11,GB3HS,145.6500,-,0.6,Tone,88.5,88.5,023,NN,FM,5.00,,,,,x,
12,GB3IMC,430.8250,+,7.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
13,GB3IMP,430.8750,+,7.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
14,GB3IMR,430.8250,+,7.6,Tone,71.9,71.9,023,NN,FM,5.00,,,,,x,
15,GB3IMS,433.1250,+,1.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
16,GB3IR,145.7625,-,0.6,Tone,88.5,88.5,023,NN,FM,5.00,,,,,x,
17,GB3LD,145.6750,-,0.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
18,GB3LF,433.3500,+,1.6,Tone,110.9,110.9,023,NN,FM,5.00,,,,,x,
19,GB3LI,433.2500,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
20,GB3MA,433.0250,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
21,GB3MF,433.0500,+,1.6,Tone,103.5,103.5,023,NN,FM,5.00,,,,,x,
22,GB3MN,145.6500,-,0.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
23,GB3MR,433.3500,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
24,GB3NA,145.6125,-,0.6,Tone,71.9,71.9,023,NN,FM,5.00,,,,,x,
25,GB3NT,433.0000,+,1.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
26,GB3NY,430.8250,+,7.6,Tone,88.5,88.5,023,NN,FM,5.00,,,,,x,
27,GB3OA,145.6125,-,0.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
28,GB3PP,433.3750,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
29,GB3PZ,430.9000,+,7.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
30,GB3RF,145.7750,-,0.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
31,GB3SY,433.1500,+,1.6,Tone,71.9,71.9,023,NN,FM,5.00,,,,,x,
32,GB3TJ,433.3000,+,1.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
33,GB3TP,145.7250,-,0.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
34,GB3TS,433.1750,+,1.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
35,GB3TW,145.7250,-,0.6,Tone,118.8,118.8,023,NN,FM,5.00,,,,,x,
36,GB3US,433.0000,+,1.6,Tone,103.5,103.5,023,NN,FM,5.00,,,,,x,
37,GB3VE,433.1000,+,1.6,Tone,77,77,023,NN,FM,5.00,,,,,x,
38,GB3WF,433.3500,+,1.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
39,GB3WP,430.9375,+,7.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
40,GB3YC,145.7500,-,0.6,Tone,88.5,88.5,023,NN,FM,5.00,,,,,x,
41,GB3YW,145.7875,-,0.6,Tone,82.5,82.5,023,NN,FM,5.00,,,,,x,
42,GB7SH,430.9625,+,7.6,Tone,71.9,71.9,023,NN,FM,5.00,,,,,x,
43,GB7SJ,430.8750,+,7.6,Tone,103.5,103.5,023,NN,FM,5.00,,,,,x,

Antenna is hung in bedroom window fairly built up area
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Re: Advise on this jpole

Postby m0lsx » Sat Oct 01, 2016 7:48 pm

They all look to be in your general area & you should manage to hear one or two of them & maybe even several. But given your antenna not that many.
Also it is worth noting that some repeaters are used a lot, some not at all. So even if you can hear say 3 or 4, it dos not mean you will hear more than a more code ident.
I assume you do not have a amateur licence, given your original question. So you really need to remove the transmit frequency & put it to 00 (zero zero) or a 446 licence free frequency if the radio will not accept 00. As like that you avoid the allegation of being a pirate.
It's what I do with all of my non amateur radio frequencies, as I know from personal experience how easy it is to accidentally transmit on a frequency I have no legal right to use.
Next personally I never use CTCSS unless I need to, as like that I stand a chance of hearing distant stations.
But find your local repeaters, that you stand a chance of hearing & work from there.
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Re: Advise on this jpole

Postby m0lsx » Sat Oct 01, 2016 7:53 pm

Preston GB3PP on 433.375 is worth listening too.
Blackpool GB3FC on 430.850, is a good probable.
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Re: Advise on this jpole

Postby G4RMT » Sun Oct 02, 2016 4:00 pm

Warning Will Robinson - this bit worries me somewhat.

The 6db of gain you get with this antenna over a typical 5/8 wave antenna more than makes up for the 1db loss in the coax.


A J-pole has no gain. A ⅝ typically has a 3dB gain over a dipole. A slim-Jim and a J-Pole have the same gain as a dipole (which of course they are closely related to) - as in zero!

So he is saying that a zero dB gain antenna is 6dB better than a 5/8th (with 3dB gain?). A J-pole does have a bit of gain compared to measuring against an isotropic base line 0dB, but so does everything else.

If it's a J-Pole, then with the thin cable, you have a less than effective antenna at the end of the cable. You'd probably find that one of those direct screw on 5/8th designs works better, than a J-Pole at the end of lossy cable!
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Re: Advise on this jpole

Postby m0lsx » Sun Oct 02, 2016 5:14 pm

A J Pole does have a gain over a dipole at the horizon, as it has a lower angle of radiation than a dipole, but 6 dB!!!. Thats CB antenna stuff.
3 dB is a 50% gain, which is a big gain, 6 dB is 50% plus 50% so it it like saying if you put 50 watts into this antenna it will give the impression you are using 200 watts. That is a massive gain & only possible to achieve in the real world using either a beam, a phased antenna array or by the creative use of physics. As often it is possible to use inaccurate gains only possible in the theoretic world, by manipulating the way you use the maths involved.
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Re: Advise on this jpole

Postby garny68 » Sun Oct 02, 2016 7:34 pm

Ok you two what you saying as thats just gone right over my head.
Is that antenna any good lol or better of with something else?
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Re: Advise on this jpole

Postby m0lsx » Sun Oct 02, 2016 9:09 pm

There is nothing at all wrong with J poles. It is the sales pitch that is wrong. Also why are you ordering from America? Spectrum Communications does the Nomad which is not bad at all for what it is. A reasonable RX antenna.
http://www.spectrumcomms.co.uk/Aerials.htm
DO NOT buy the one with the pre amp. Pre amps can be bad news.
I assume you cannot put a outdoor antenna up outside, as an indoor antenna is not as efficient as one outdoors & it is probably lower.
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Re: Advise on this jpole

Postby garny68 » Sun Oct 02, 2016 9:58 pm

Hi the nomad is what i originally wanted but couldnt find it i stock anywhere and saw the one i ordered somewhere and got that . But thanks for the site spectrum no i cant put an outside antena up but can move antenna into loft
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