EC10 MkII - UK Vintage Radio Repair and Restoration Discussion Forum

Gridleak · 21st Nov 2009, 11:21 pm

Hi all,
Been repairing my EC10 MKII and all is well now, other than the BFO Coil is GONE, and i mean literally gone !!. Could anyone give me the spec's for the coil i.e. winding info, so i can make myself a new one ??

Regards Paul.....

g4aaw pete · 22nd Nov 2009, 4:30 pm

Hi Paul

may be worth contacting Ian Nutt at the Eddystone users Group,

http://www.eddystoneusergroup.org.uk/

go the the 'eddystone spares' section in the left-hand payne.

He keeps a quatity of replacement parts at less than rip-off prices.

Good luck
Pete

Herald1360 · 22nd Nov 2009, 8:55 pm

You could figure out the inductance of the main part of the BFO coil from the IF frequency 465KHz and the capacitors tuning it. The other two coupling windings could maybe be found by a bit of experimenting.

Alternatively, the coil circuit looks suspiciously similar to an ordinary MW oscillator coil used in any old tranny mixer circuit- given the EC10 IF of 465KHz, one of these would probably work, maybe with some capacitor tweaking.

Chris

Gridleak · 25th Nov 2009, 8:10 pm

Hi Pete & Chris,

Thanks for the suggestions, it's a case of does one keep it original or not ?.

I Probably would not have worried to much about the lack of BFO, but i fancy running this on topband along with my AT5 .

However i bet someone will try returning to my calls on LSB !!!.

Will think this one over but again thanks to you both..

Regards Paul G4HDS.

Racalfanatic · 28th Nov 2009, 8:13 pm

I found the original BFO to drift too much. I fitted a Ten Tec BFO kit and adjusted the EC10 IF to work at 455KHz.

21st Nov 2009, 11:21 pm	#1
Gridleak Triode Join Date: Nov 2009 Location: Darkest Northumberland. Posts: 13	EC10 MkII Hi all, Been repairing my EC10 MKII and all is well now, other than the BFO Coil is GONE, and i mean literally gone !!. Could anyone give me the spec's for the coil i.e. winding info, so i can make myself a new one ?? Regards Paul.....

22nd Nov 2009, 4:30 pm	#2
g4aaw pete Heptode Join Date: Jan 2008 Location: Birchington Kent, UK. Posts: 596	Re: EC10 MkII Hi Paul may be worth contacting Ian Nutt at the Eddystone users Group, http://www.eddystoneusergroup.org.uk/ go the the 'eddystone spares' section in the left-hand payne. He keeps a quatity of replacement parts at less than rip-off prices. Good luck Pete

22nd Nov 2009, 8:55 pm	#3
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: EC10 MkII You could figure out the inductance of the main part of the BFO coil from the IF frequency 465KHz and the capacitors tuning it. The other two coupling windings could maybe be found by a bit of experimenting. Alternatively, the coil circuit looks suspiciously similar to an ordinary MW oscillator coil used in any old tranny mixer circuit- given the EC10 IF of 465KHz, one of these would probably work, maybe with some capacitor tweaking. Chris

25th Nov 2009, 8:10 pm	#4
Gridleak Triode Join Date: Nov 2009 Location: Darkest Northumberland. Posts: 13	Re: EC10 MkII Hi Pete & Chris, Thanks for the suggestions, it's a case of does one keep it original or not ?. I Probably would not have worried to much about the lack of BFO, but i fancy running this on topband along with my AT5 . However i bet someone will try returning to my calls on LSB !!!. Will think this one over but again thanks to you both.. Regards Paul G4HDS.

28th Nov 2009, 8:13 pm	#5
Racalfanatic Retired Dormant Member Join Date: Aug 2007 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 105	Re: EC10 MkII I found the original BFO to drift too much. I fitted a Ten Tec BFO kit and adjusted the EC10 IF to work at 455KHz.