23 cms Mobile Antenna designs
TODD NORTHOVER <TODD.NORTHOVER@...>
Hi all in the group i wonder if any of you guys have any designs
please for a 23 cms mobile ant . Possibly 5/8 over 5/8 etc or somthing a bit more exotic. Wanted for repeater work (GB3BK) which will be on air soon . Anything appreciated . Regards Todd
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John Quarmby
Hi Todd
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As I recollect most of the 23cm voice repeaters are horizontally polarised so they can be used as beacons. The Alford slot antenna might be suitable, it is described in several forms in various UHF/Microwave manuals. 73 John G3XDY
----- Original Message -----
From: "TODD NORTHOVER" <TODD.NORTHOVER@NTLWORLD.COM> To: <ukmicrowaves@yahoogroups.com> Sent: Tuesday, November 13, 2007 11:01 PM Subject: [ukmicrowaves] 23 cms Mobile Antenna designs Hi all in the group i wonder if any of you guys have any designs
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Chris Bartram <yahoo@...>
When I was last active mobile on 23cm mobile - I hate to think how many years
ago - I used a cloverleaf. I still have it somewhere. Although 'Alford' slot antennas have a bit more gain, they are pretty unwieldy beasties at 1.3GHz, particularly when mounted on cars... A cloverleaf, mounted on a 10mm dia mast - which can be made to fit safely on a standard gutter mount - can easily sit a couple of wavelengths above the roof of the vehicle, ensuring that most of the energy is on the horizon, not wasted in high angle lobes. The relatively high phase centre also means that the antenna has a reasonable chance of seeing over hedges. I couldn't recommend it now, but at one stage I had the cloverleaf mounted on a 1.5m mast fixed to the centre of the roof of the muTek Transit van. It was guyed to the four corners of the roof. I seem to remember G4SJP working a French station at 4-500km with that and a 2W transverter while we were driving up the M5 in Somerset one year during VHF NFD... Vy 73 Chris GW4DGU
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Chris G8BKE
I used a Big Wheel antenna quite successfully mobile for some time...the design originated in VHF Comms magazine Edition 4, 1979. It comprised 3 wire loops each 22.2cm long in a clover leaf configuration soldered to a N type bulkhead connector, on end of each loop soldered to the centre spigot, the other 3 ends soldered to ground.
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As its quite a compact antenna they can be stacked too. One can also re-dimension a 2meter halo antenna for 23 cms too. Both are for horizontal polarisation operation. 73 de Chris G8BKE Web Site:- http://myweb.tiscali.co.uk/g8bke/ Mobile Antenna designs
Hi all in the group i wonder if any of you guys have any designs please for a 23 cms mobile ant .
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SAM JEWELL
I seem to recall that as the RSGB Microwave Committee, we were approached to allow vertical polarisation on at least 23cm FM voice repeater (maybe Farnborough?) to see if it would make mobile operation easier and more effective. ?
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The group involved were to report back to the Committee on results. I don't believe this ever happened and when the Committee was disbanded it would have become a victim of fading memory........... 73 de Sam G3XDY wrote:
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Alan Melia
Hi Todd, with a table next to kent at the MH Round Table I remember seeing
something like a pcb "cloverleaf" ...it isn't that desgn but has the same sort of profile and should be easy to put in a weather resistant "radome" I think Sam G4DDK often keeps samples of Kent's wares. Cheers de Alan G3NYK
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Ian Lamb <ianlamb@...>
Hi Sam,
Farnborough? or do you mean Farnham? Certainly my local group at Farnham used to run vertical polarisation on GB3FM [1297.050 output] until recently. After the antenna went u/s it was replaced with a horizontally polarised Alford slot which is why so many home stations are hearing it better than ever now. It may be the case that the group were to report back but in reality I have never heard of anyone mobile working through this repeater. Hope this helps? 73 .. Ian G8KQW ________________________________ From: ukmicrowaves@yahoogroups.com on behalf of SAM JEWELL Sent: Wed 14/11/2007 15:34 To: ukmicrowaves@yahoogroups.com Subject: Re: [ukmicrowaves] 23 cms Mobile Antenna designs I seem to recall that as the RSGB Microwave Committee, we were approached to allow vertical polarisation on at least 23cm FM voice repeater (maybe Farnborough?) to see if it would make mobile operation easier and more effective. ? The group involved were to report back to the Committee on results. I don't believe this ever happened and when the Committee was disbanded it would have become a victim of fading memory........... 73 de Sam G3XDY <g3xdy@btinternet.com> wrote: Hi Todd As I recollect most of the 23cm voice repeaters are horizontally polarised so they can be used as beacons. The Alford slot antenna might be suitable, it is described in several forms in various UHF/Microwave manuals. 73 John G3XDY ----- Original Message ----- From: "TODD NORTHOVER" <TODD.NORTHOVER@NTLWORLD.COM <mailto:TODD.NORTHOVER%40NTLWORLD.COM> > To: <ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> > Sent: Tuesday, November 13, 2007 11:01 PM Subject: [ukmicrowaves] 23 cms Mobile Antenna designs > Hi all in the group i wonder if any of you guys have any designs > please for a 23 cms mobile ant . > Possibly 5/8 over 5/8 etc or somthing a bit more exotic. > Wanted for repeater work (GB3BK) which will be on air soon . > Anything appreciated . > Regards Todd > > > > > Yahoo! Groups Links > > >
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SAM JEWELL
Yes, Farnham. My error.
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Also, yes, I have stock of Kent's 1296MHz PCB big wheel antennas at 8UKP inc P&P. I accept Paypal...... We have a pair of these on the Ipswich 23cm digital ATV repeater, which is currently being tested. You may have seen it at Martlesham, last weekend, if you went to see the beacons. 73 de Sam Ian Lamb wrote:
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mikeg3pfr@...
In a message dated 14/11/2007 15:35:19 GMT Standard Time,
jewell@... writes:
I seem to recall that as the RSGB Microwave Committee, we were approached to allow vertical polarisation on at least 23cm FM voice repeater (maybe Farnborough? Quite correct, Sam! I might remember wrongly, but I seem to think that the
"diehards" (those who had practised some /M operation on 23cm) stuck out for
horizontal polarisation, on the grounds that an Alford Slot was a suitable
antenna, as were the "clover-leaf" or "Big Wheel" and, maybe even a version of
the "halo" or "Squarial".
Too long ago - my memory fades....!
Regards, Mike, G3PFR
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mikeg3pfr@...
In a message dated 14/11/2007 23:20:38 GMT Standard Time, mjniman@...
writes:
"Antennas (Mandatory) How/When did this one creep in? News to me!
Regards, Mike, G3PFR
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Murray Niman <mjniman@...>
Dont count on Horizontal from 23cm repeaters !
The Ofcom spec for all voice repeaters says: "Antennas (Mandatory) Vertical polarisation must be used for all speech repeaters unless explicitly authorised. The height of the antenna must be no greater than that specified on the NOV, and the polar diagram must not be changed without written permission." Murray --- In ukmicrowaves@yahoogroups.com, SAM JEWELL <jewell@...> wrote: 8UKP inc P&P. I accept Paypal...... which is currently being tested. You may have seen it at Martlesham, last weekend, if you went to see the beacons. polarisation on GB3FM [1297.050 output] until recently. After the antenna went u/s it wasreplaced with a horizontally polarised Alford slot which is why so many homestations are hearing it better than ever now.reality I have never heard of anyone mobile working through this repeater.approached to allow vertical polarisation on at least 23cm FM voice repeater (maybe Farnborough?) to see if it would make mobile operation easier and more effective. ? The group involved were to report back to the Committee on results.I don't believe this ever happened and when the Committee was disbanded it would have become a victim of fading memory........... polarised so they can be used as beacons. The Alford slot antenna might besuitable, it is described in several forms in various UHF/Microwave manuals.<mailto:TODD.NORTHOVER%40NTLWORLD.COM> > To: <ukmicrowaves@yahoogroups.com<mailto:ukmicrowaves%40yahoogroups.com> > Sent: Tuesday, November 13, 2007 11:01 PM
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TODD NORTHOVER <TODD.NORTHOVER@...>
Hi there sam i wouldnt mind one of those .
Please send me your address i havent got paypal at the mo . Thank,s for your help as well . 73 de Todd G0TOD --- In ukmicrowaves@yahoogroups.com, SAM JEWELL <jewell@...> wrote: at 8UKP inc P&P. I accept Paypal...... which is currently being tested. You may have seen it at Martlesham, last weekend, if you went to see the beacons. polarisation on GB3FM [1297.050 output] until recently. After the antenna went u/s itwas replaced with a horizontally polarised Alford slot which is why so many homestations are hearing it better than ever now.reality I have never heard of anyone mobile working through this repeater.approached to allow vertical polarisation on at least 23cm FM voice repeater (maybe Farnborough?) to see if it would make mobile operation easier and more effective. ? The group involved were to report back to the Committee onresults. I don't believe this ever happened and when the Committee was disbanded it would have become a victim of fading memory........... polarised so they can be used as beacons. The Alford slot antenna might besuitable, it is described in several forms in various UHF/Microwavemanuals. <mailto:TODD.NORTHOVER%40NTLWORLD.COM> > To: <ukmicrowaves@yahoogroups.com <mailto:ukmicrowaves%40yahoogroups.com> > Sent: Tuesday, November 13, 2007 11:01 PMdesigns > please for a 23 cms mobile ant .
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TODD NORTHOVER <TODD.NORTHOVER@...>
Hi all just to clear things up a bit GB3BK is/Will be hor/pol.
I have a antenna for mobile use which is a diamond tribander but its too cumbersome for my works Vehicle . Hence a Smaller antenna needed . Sorry for any confusion . Regards Todd G0TOD. --- In ukmicrowaves@yahoogroups.com, "TODD NORTHOVER" <TODD.NORTHOVER@...> wrote: antennas at 8UKP inc P&P. I accept Paypal......repeater, which is currently being tested. You may have seen it atMartlesham, last weekend, if you went to see the beacons.voicepolarisation on GB3FM repeater (maybe Farnborough?) to see if it would make mobilehorizontally polarisedbeso they can be used as beacons. The Alford slot antenna might suitable,it is described in several forms in various UHF/Microwavemanuals.<mailto:TODD.NORTHOVER%40NTLWORLD.COM> >
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Murray Niman <mjniman@...>
That wording is from the latest edition of the Repeater licensing
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guide, (not the woolly old RA version) and shows the value of keeping an eye over related parts of the hobby for when the next little trap pops up:) It seems reasonable as a default for mobiles, unless a keeper/application has requested it otherwise in his app/NoV Murray
--- In ukmicrowaves@yahoogroups.com, mikeg3pfr@... wrote:
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mikeg3pfr@...
In a message dated 15/11/2007 00:46:21 GMT Standard Time, mjniman@...
writes:
That wording is from the latest edition of the Repeater licensing Yea, verily! Thanks, Murray, for the info.
Regards, Mike, G3PFR
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Graham Shirville <g.shirville@...>
Hi Murray...
uum looks wrong to me - the RMC (now ETCC) have
always said Horizontal for 23cms repeaters and from memory also approved a
"mixed" polarisation one some time back but this is not my
area.
Suggest you contact the Chairman of ETCC who will be able to get it sorted quickly... 73
Graham
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SAM JEWELL
Hi Todd,
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cheque for 8 to S Jewell Blenheim Cottage, Falkenham, Ipswich, IP10 0QU Take a look at www.wa5vjb.com for details 73 de Sam TODD NORTHOVER wrote:
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