Base antenna for 446 mhz help needed
- WARLOCK
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Base antenna for 446 mhz help needed
just bought and received a base antenna for PMR446 Mhz, e/bay item number 302491369589 from stanislavpalo130 when i tested the antenna i find there is a short between the inner section and outer section of the coax cable should this be so ???
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Re: Base antenna for 446 mhz help needed
I bought one from him too, and it's sitting here and I can confirm it's a DC grounded antenna, so the short is correct. Mine actually works rather well on 433 and 453 too! Mine is 1.17 VSWR at 448.1MHz at it's best on the analyser.
- gmham
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Re: Base antenna for 446 mhz help needed
So if it's showing it's lowest vswr on 448.1mhz can I ask what it's showing on it's intended design freq off 446mhz ?
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John - 108TM154 / 108CO154
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Moxon antenna for 10/20 mtrs
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John - 108TM154 / 108CO154
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Re: Base antenna for 446 mhz help needed
1.2 I spotted these about a year ago and have had a UHF high band one and the 446, and the tuning is quite sharp, it's not got much response at any other frequency, then suddenly takes a dive right down. It's handy for 449MHz too. I tried to make something very similar, and found that inside mm accuracy was critical at UHF, and while with wideband designs it doesn't matter.
EDIT - I've just spotted that I mixed them up. The ones I have are these ones 302501691331 (in 446 and 453 versions)
Which is a half wave design, compared to the 5/8th one this post relates to - mine of course is not tenable, being sealed in the tube, while the ⅝ version is.
He makes decent quality kit, and while I make a few myself, his are neater and surprisingly light!
EDIT - I've just spotted that I mixed them up. The ones I have are these ones 302501691331 (in 446 and 453 versions)
Which is a half wave design, compared to the 5/8th one this post relates to - mine of course is not tenable, being sealed in the tube, while the ⅝ version is.
He makes decent quality kit, and while I make a few myself, his are neater and surprisingly light!
- Admiral
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Re: Base antenna for 446 mhz help needed
"DC ground coil for full static protection"
He put a clue in the listing, you will still need to make sure you ground it though. Plus, it has an N connector, so make sure you get one of those on the end of your coax as adaptors outdoors will invite moisture and could be lossy if they are ten bob Chinese things.
He put a clue in the listing, you will still need to make sure you ground it though. Plus, it has an N connector, so make sure you get one of those on the end of your coax as adaptors outdoors will invite moisture and could be lossy if they are ten bob Chinese things.
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Re: Base antenna for 446 mhz help needed
I love that guy's antennas. They are good ****. They work on principles of gamma match magic. Bought a yagi from him a while ago and have made 100+ mile contacts with it.WARLOCK wrote:just bought and received a base antenna for PMR446 Mhz, e/bay item number 302491369589 from stanislavpalo130 when i tested the antenna i find there is a short between the inner section and outer section of the coax cable should this be so ???
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Good Christian Boys: Midland G7 XTR "Street-Legal" PMR 3-watter - Kenwood UBZ-LJ8 PMR446 - Intek FM548SX (With Homogolation boys )
Naughty Boys: Philips 25W FM1100 UHF w/PA4DEN - Baofeng UV5RA, Superstar 360FM (My good one!) w/ CTE 747 100W Amp
Good Christian Boys: Midland G7 XTR "Street-Legal" PMR 3-watter - Kenwood UBZ-LJ8 PMR446 - Intek FM548SX (With Homogolation boys )
Naughty Boys: Philips 25W FM1100 UHF w/PA4DEN - Baofeng UV5RA, Superstar 360FM (My good one!) w/ CTE 747 100W Amp
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Re: Base antenna for 446 mhz help needed
Best out the box antenna for 446 that I’ve used is a w2000 not a v2000 the Watson model works way better on 446 ,also it’s a great scanning antenna as it covers a lot of bands ,
Enjoy
Enjoy
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Re: Base antenna for 446 mhz help needed
The Sirio PMR446 antenna is very good, it also covers 70cms and of course LPD433 as well.
- Farty
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Re: Base antenna for 446 mhz help needed
I use a 440 J pole adjusted for 446. Forks nicely, cheap as chips.
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