CB'ing and Ham radio in the 21st Century
28-03-2012, 13:42
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#61
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81-82-83-84
Join Date: Nov 2006
Location: on holiday by mistake
Age: 54
Services: Vivid 200, Full House, V6 x2
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Re: CB'ing and Ham radio in the 21st Century
Aye theoretically around 35-36 ohms over a perfect groundplane which would present an swr of around 2:1 in an unbalanced 50 ohm system. Bringing that down to a more acceptable level of swr using the radiator cutting method would indeed throw you off resonance.
The LA8OKA corner-fed delta loop is an interesting antenna. Using a specific ratio of side dimensions you can bring the feed-point impedance down to the 50 ohm mark which effectively gives you the best of both worlds in terms of cutting out matching system losses (by not having to use one) while retaining resonance. I have one up for 20m suspended between two fishing poles using aluminium welding wire for the radiator itself - it's an excellent DX antenna for it's profile.
http://www.arcticpeak.com/antennapag...delta_loop.htm
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28-03-2012, 14:57
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#62
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cf.mega poster
Join Date: Jul 2003
Location: Lincolnshire
Age: 35
Posts: 2,028
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Re: CB'ing and Ham radio in the 21st Century
I never was into CB or Ham but had a scanner for years, took the aerial down this weekend as when the Emergency Services went over to Tetra it all got boring!
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28-03-2012, 15:26
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#63
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Inactive
Join Date: Mar 2009
Posts: 665
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Re: CB'ing and Ham radio in the 21st Century
Kymmy/Peter - thanks for the very detailed info.
I'll look more closely into this and see if I can't get away with a pole on the back wall. Should make things less complicated.
Having fun at the mo choosing a new rig
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28-03-2012, 16:13
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#64
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Inactive
Join Date: Dec 2007
Posts: 18,398
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Re: CB'ing and Ham radio in the 21st Century
Quote:
Originally Posted by Blackened
Having fun at the mo choosing a new rig
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Was in Rocket Radio in Letchworth today (great little shop with some good stuff in..grabbing a few PL259's and some 2" mast clamps to put up the new antenna) I did like the look of the Lafeyette Venus which has all the controls on the microphone..
As for an antenna if you can get an outside one then if they're still made an antron 99 or similar and you can't go wrong..
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28-03-2012, 16:18
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#65
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81-82-83-84
Join Date: Nov 2006
Location: on holiday by mistake
Age: 54
Services: Vivid 200, Full House, V6 x2
Posts: 5,977
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Re: CB'ing and Ham radio in the 21st Century
Pop a flag on top, nobody will say owt
That's a canny trick for your fishing-pole verticals.
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28-03-2012, 17:09
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#66
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Inactive
Join Date: Mar 2009
Posts: 665
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Re: CB'ing and Ham radio in the 21st Century
Nice that Kymmy.
I reckon I'll go retro at this stage though. Can't help myself. I love those old rigs.
On the hunt for a Superstar 2000 with the 5 banks of 40 or a 148GTLDX with some extra freqs. Money's a bit tight at the mo though so could go with something lower end for the time being.
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28-03-2012, 17:48
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#67
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NoT 1oF tHe UsUaLSuSpeCtS
Join Date: Aug 2009
Location: DaRk SiDe Of ThE MooN
Services: Hyper-Optic 1Gig
Posts: 645
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Re: CB'ing and Ham radio in the 21st Century
lol i remember my cb days..i had a cobra 148 and a superstar 360 plus a sigma 4 on the roof on top of a very large scaffolding pole and a nice meaty 500w solid state burner
used to be fun and games
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28-03-2012, 18:33
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#68
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81-82-83-84
Join Date: Nov 2006
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Re: CB'ing and Ham radio in the 21st Century
heh if it was a Zetagi B550 then I bet it wasn't very linear either
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28-03-2012, 18:54
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#69
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NoT 1oF tHe UsUaLSuSpeCtS
Join Date: Aug 2009
Location: DaRk SiDe Of ThE MooN
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Posts: 645
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Re: CB'ing and Ham radio in the 21st Century
Quote:
Originally Posted by heero_yuy
Bet your neighbours liked you.
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yea them and the dti lol .....
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28-03-2012, 19:01
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#70
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81-82-83-84
Join Date: Nov 2006
Location: on holiday by mistake
Age: 54
Services: Vivid 200, Full House, V6 x2
Posts: 5,977
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Re: CB'ing and Ham radio in the 21st Century
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28-03-2012, 19:24
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#71
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Inactive
Join Date: Dec 2007
Posts: 18,398
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Re: CB'ing and Ham radio in the 21st Century
Quote:
Originally Posted by djfunkdup
yea them and the dti lol .....
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You're safe now, DTI don;t exist any more... instead you'll get Ofcom chasing you
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29-03-2012, 12:18
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#72
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Inactive
Join Date: Mar 2009
Posts: 665
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Re: CB'ing and Ham radio in the 21st Century
So much for old skool (and tight budget though £150 ain't too bad for a rig like this)
Just got one of these
6 banks of 60 covering 25.615 to 30.105Mhz & multi-programmable from the PC
(so you can make it go from 1-40 CEPT on one bank for example).
Interesting foray back into radio and probably a bit of a whim, but hey.
The YouTube vids suckered me in.
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29-03-2012, 19:51
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#73
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81-82-83-84
Join Date: Nov 2006
Location: on holiday by mistake
Age: 54
Services: Vivid 200, Full House, V6 x2
Posts: 5,977
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Re: CB'ing and Ham radio in the 21st Century
Quote:
Originally Posted by Blackened
So much for old skool (and tight budget though £150 ain't too bad for a rig like this)
Just got one of these
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Interesting bit of kit that and also to see that the market for those export type radios is still very much alive and kicking. A lot of the old names like President, Superstar and Cobra are still kicking about it seems.
Just in time for sporadic E season eh, hours of fun to be had with the Russian taxi drivers
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29-03-2012, 21:15
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#74
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Inactive
Join Date: Mar 2009
Posts: 665
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Re: CB'ing and Ham radio in the 21st Century
Heh.
Superstar not always to be associated with the old now, Peter. Or at least not old rigs. Chinese built models are all over the place now, with freq counters and blue displays. Whilst hunting I was offered a Superstar 3900 and a Superstar Ranger both pretty much new boxed models. Word is, they lack the integrity and stability of their counterparts, and new surface mounted components make them difficult to repair - but they have the look mate. I was seriously tempted. The Ranger with the freq counter is a lovely thing.
http://www.gijoesradioelectronics.co...idproduct=1152
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29-03-2012, 22:12
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#75
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81-82-83-84
Join Date: Nov 2006
Location: on holiday by mistake
Age: 54
Services: Vivid 200, Full House, V6 x2
Posts: 5,977
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Re: CB'ing and Ham radio in the 21st Century
I guess they're all based on a limited subset of chassis like back in the day. I had one of the first generation of Superstar 3900s - must have been around 89-90. Basically a cheapo copy of the PB010 which reflected on the performance of the radio which was not aligned properly in the factory: carrier leakthrough and all kinds of grounding issues due to poor soldering and general design problems. IIRC I swapped that for a President Lincoln which had shocking selectivity but after installing the uprated 1st and 2nd IF filters (crystal and active) it was a pretty solid radio.
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