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 PA0RDT mini-whip -- your views? 
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Post PA0RDT mini-whip -- your views?
Just bought one on FleaBay
At less than £25 inc postage --thought i'd give it a go
I know your all going to tell me i could.ve built one for a fiver -- but i couldn't be bothered!
The link below makes interesting reading
I'd appreciate any opinions on this tiny antenna
Thanks#
Vic
mi0aey

http://dl1dbc.net/SAQ/Mwhip/Article_pa0 ... nglish.pdf


Sun Feb 17, 2013 5:52 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Vic,

A quick read of the article suggests the author doesn't know much about communications theory ...... but the antenna might not mind ;)

Steve G3TXQ


Sun Feb 17, 2013 6:20 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Hi Vic

Last year a friend of mine, whose main interest is ELF to MF, loaned me his homebrew version of the Miniwhip to experiment with.

It is imperative that it is mounted outside in the clear.

My experience with it was one of surprise. I found it performed remarkably well between 10KHz and 3MHz but performance
on the higher HF bands eg 14MHz and up, were not so great.

What was really cool was to plug the antenna directly into my soundcard (EMU0202 sampling at 192KHz) to resolve 10KHz (the
antenna response really rolled off below 10KHz) and 96KHz ( half the maximum sampling rate based on Nyquist theorem).

Using HDSDR I was able to monitor the Higher ELF and lower VLF allocations, see picture below:

Attachment:
Soundcard_VLF2.jpg
Soundcard_VLF2.jpg [ 72.76 KiB | Viewed 1079 times ]



The labels in the image correspond to the list below:

A = Russian Alpha navigational beacon.
B = HWU - French Naval communications (MSK)
C = GQD (6) 22100 Skelton, UK Locator: IO84nr N 54° 43' 54.48" (+54.731799°) W 002° 52' 58.92" (-002.883033°)
D = DHO38 (7) 23400 Rhauderfehn, Germany Locator: JO33tb N 53° 04' 44.04" (+53.078900°) E 007° 36' 54.00" (+007.615000°)
E = TBB 26700 Bafa, Turkey Locator: KM37pj N 37° 24' 45.81" (+37.412725°) E 027° 19' 24.03" (+027.323342°)
F = NRK/TFK 37500 Grindavik, Iceland Locator: HP83su N 63° 51' 1.31" (+63.850365°) W 022° 28' 0.38" (-022.466773°)
G = NSY 45900 Niscemi, Italy Locator: JM77fd N 37° 07' 32.37" (+37.125660°) E 014° 26' 11.10" (+014.436416°)
H = GYW1 51950 Crimond, UK Locator: IO97bo N 57° 37' 2.87" (+57.617464°) W 001° 53' 15.34" (-001.887595°)
I = MSF (10) 60000 Anthorn, UK Locator: IO84iv N 54° 54' 40.30" (+54.911195°) W 003° 16' 45.49" (-003.279302°)

Others above 60KHz include :

FUG 62600 La Régine, France Locator: JN13bj N 43° 23' 12.47" (+43.386798°) E 002° 05' 50.60" (+002.097388°)
FUE 65800 Kerlouan, France Locator: IN78tp N 48° 38' 15.62" (+48.637672°) W 004° 21' 2.61" (-004.350725°)
DCF77 (14) 77500 Mainflingen, Germany Locator: JO40ma N 50° 00' 55.48" (+50.015411°) E 009° 00' 29.90" (+009.008307°)
GYN2 81000 Inskip, UK Locator: IO83nt N 53° 49' 48.26" (+53.830071°) W 002° 50' 3.36" (-002.834266°)

Further analysis yielded many other stations and time signals but as yet the origins are unknown.

It's a fun antenna and with a modification it's possible to increase the response below 7KHz and monitor natural radio activity
such as lightening, aurora, and siesmic activity.

Regards


Sun Feb 17, 2013 9:35 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Thanks for the comprehensive reply---this may well show some promise

If it improves my chances on MW Broadcast (on a Yaesu 8800) it'll be money well spent -- i've always been plagued by noise in the evenings --the chances of hearing anything decent have been nil --so who knows

thanks
Vic


Sun Feb 17, 2013 10:19 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Let us know how you get on, Vic.
My findings re loops vs whips are the opposite. As a low band listener myself, I find any attempt to rx on any kind of wire or whip just gives me lots of noise, mainly crud from smps and general hash. On my Wellbrook loop the noises just disappear, or nearly so.

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Andy


Sun Feb 17, 2013 11:14 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
The next rainy day we get I might build one and compare it with my active loop. But the weather's just too nice at the moment :)

73,
Steve G3TXQ


Mon Feb 18, 2013 11:33 am
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Hi there,is there anywhere i can buy one ready made?
thanks
paul


Tue Feb 19, 2013 9:00 am
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
I built one from the supplied circuit (I don't know why as I've built them before and had nothing but grief!) and hung it up as far away from the house as I could. Result - wall to wall buzzing & humming (typical smps/tv noise) on LF, MF and the lower HF bands.
So I've put it in the 'abandoned projects' drawer and gone back to my Wellbrook!
I'm sure these antennas are brilliant in a fairly quiet location, especially at low freq's, but around here they are a waste of time. :confused:

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Andy


Tue Feb 19, 2013 4:04 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
I have had one for some while...it is excellent for LF use (NDBs etc) at those frequenciesit well up with my Wellbrook loop but dont expect much above 10mHz or so.

Recommended.

Roger G0IUW


Thu Feb 21, 2013 2:42 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Well it arrived well packaged and has been up a few days now
I've no fancy figures or graphs to show its performance --- BUT IT DOES WORK ---and for its miniature size works well
I'd agree with G0IUW's comment --- its good up to @ 10mhz --so suits me for MW listening and HF airband/kinloss etc up to 10mhs --- 40m sounds good
It's not a complete miracle worker -- if you were suffering from high noise levels -- then you'll still have noise but not as much
I'm comfortably listening to Gander ATC on 8864 as I type
It's tiny size is its big strong point -- at @ 8 inches long its practically invisible
All in all --a good buy at less than £25 all in
Theres really no longer any reason for anyone no matter what they're restrictions -- to now have a reasonable receive antenna for the bands below 10mhz --i've mine cable tied to an outside PVC drainpipe --same colour--white-- you'd have to make it your business to even notice it (i was also listening to 20m -- and it was certainly useable)
Bye
Vic
mi0aey


Sun Feb 24, 2013 5:56 pm
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 PA0RDT mini-whip -- your views? 
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Post Re: PA0RDT mini-whip -- your views?
Just went out and measured it--its only 5 inches long


Sun Feb 24, 2013 6:10 pm
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