this. http://www.radioshack.com/product/index ... =CT2032189
Its for an off-centre dipole that I'm building.I can't find a supplier in this God-forsaken neck of the woods.Even the 'Bay goes straight to the US,as does Amazon,so I may have to end up buying there.Cheers.
Trying to fin UK source of....
-
- Radio Addict
- Posts: 543
- Joined: 15 Jan 2008, 16:13
- Location: Downpatrick,N.Ireland
Trying to fin UK source of....
2 X PRO 2006 1 X DX-394 1 X GRE PSR 282 1 X UBC780XLT with ProScan 1 X Pro43 1 X Yaesu FRG 100 Uniden 125 XLT LCL 2740.
- Jon_D
- Radio Addict
- Posts: 544
- Joined: 16 Apr 2010, 23:14
- Call Sign: G4FUT
- Location: Barnard Castle IO94an
Re: Trying to fin UK source of....
For my OCFDipole, I use a 4:1 balun. this can be fed with either coax which has a common mode choke to stop the outer radiating, or ladder line.
Even if the voices on my head aren't real, they do have some pretty good ideas
Jon G4FUT
Ex-Army
RSARS 1425
Jon G4FUT
Ex-Army
RSARS 1425
- GW0DIV
- Radio Addict
- Posts: 996
- Joined: 13 Aug 2010, 18:23
- Call Sign: GW0DIV
- Contact:
Re: Trying to fin UK source of....
Unless it's for RX, QRP or you really want that paricular item, I would use any of the dozens of off the shelf solutions available from the UK or wind my own 4:1 balun. I would think more than a Watt or two would flush all the "magic smoke" right out of tha balun!!
http://www.facebook.com/southwalesradio
http://www.radioclubs.net/rars/
Twitter: @GW0DIV
President of Bristol Channel Repeater Group
http://www.radioclubs.net/rars/
Twitter: @GW0DIV
President of Bristol Channel Repeater Group
-
- Radio Addict
- Posts: 543
- Joined: 15 Jan 2008, 16:13
- Location: Downpatrick,N.Ireland
Re: Trying to fin UK source of....
I'm following this guys lead http://forums.radioreference.com/build- ... tenna.html Hes building it for his scanner,so he says.I don't really need it but I thought I'd give it a go anyway.Give me something to do.What do you guys think of it?
2 X PRO 2006 1 X DX-394 1 X GRE PSR 282 1 X UBC780XLT with ProScan 1 X Pro43 1 X Yaesu FRG 100 Uniden 125 XLT LCL 2740.
- crusty
- Veteran
- Posts: 3229
- Joined: 02 May 2008, 18:28
- Location: East Lancs. UK
Re: Trying to fin UK source of....
I built/use the same OCF dipole. My tests showed the balun made no difference to received signals at VHF, but produced weaker signals at UHF regardless of balun winding or core material. I ditched the idea, and now use a bunch of type 73 ferrite beads on the coax close to the feedpoint. Works best as a low profile broadband antenna when mounted in the clear. HTH.
-
- Radio Addict
- Posts: 543
- Joined: 15 Jan 2008, 16:13
- Location: Downpatrick,N.Ireland
Re: Trying to fin UK source of....
Thanx crusty.I mainly listen to airband and have just built a dedicated dipole for that purpose,using the same materials.I had a lot of copper pipe left over afterwards so rather than throw it out,I thought I'd have a go at something else.These type 73 beads you speak of,would they be any better,or worse than a 4:1 balun?
Also,if you don't mind me asking,what is 'HTH' at the end of your post?
Also,if you don't mind me asking,what is 'HTH' at the end of your post?
2 X PRO 2006 1 X DX-394 1 X GRE PSR 282 1 X UBC780XLT with ProScan 1 X Pro43 1 X Yaesu FRG 100 Uniden 125 XLT LCL 2740.
-
- Radio Addict
- Posts: 526
- Joined: 07 Apr 2012, 18:10
- Location: Jordanstown, Northern Ireland
- crusty
- Veteran
- Posts: 3229
- Joined: 02 May 2008, 18:28
- Location: East Lancs. UK
Re: Trying to fin UK source of....
Hi Bassman. The ferrite beads act as a choke to reduce the chance of local interference (common mode currents) being picked up on the coax's outer conductor. They don't do any impedance transformation like a 4:1 balun, they just help keep unwanted signals out of the receiver. If you still want to experiment with using a 4:1 balun, I got the best results using a BN-61-0202 binocular core with twisted bifilar windings.
The OCF vertical dipole is handy as its resonant on it's even harmonic, and gives a double sweet-spot depending on what frequency you cut the dipole for. I cut mine for 122mhz and has a second peak response at 244mhz (one leg 42cm, the other 74cm).
The OCF vertical dipole is handy as its resonant on it's even harmonic, and gives a double sweet-spot depending on what frequency you cut the dipole for. I cut mine for 122mhz and has a second peak response at 244mhz (one leg 42cm, the other 74cm).