National 1-10 VHF Regenerative Receiver - UK Vintage Radio Repair and Restoration Discussion Forum

wa4mnt0696 · 21st Feb 2022, 4:48 pm

Hello group,

I have recently acquired a National 1-10 VHF Regen Receiver, mfg. date 2/22/1946. Originally it came six coil sets. Unfortunately the only coil I have is the "F" pair (30MHz-42MHz). I was wondering if anyone may have the plug-in details for the remaining "A" through "E" sets. Mechanically I can come close to the original designs, but need the turns count, and or, any additional component definitions. I have a copy of the original owners manual, but it is not descriptive in this area.

Thank you in advance.

Ken - wa4mnt
Clarkdale, AZ

Bazz4CQJ · 22nd Feb 2022, 2:07 pm

Hi Ken, welcome to the Forum. While there are numerous HRO 5's in the UK, I've never seen or heard of anyone here owning one of the VHF sets you refer to. If you cannot find the data in the US, I wouldn't be hopeful that you'll have much luck in the UK.

B

G3VKM_Roger · 22nd Feb 2022, 5:06 pm

Hi Ken,

There are some coil photos here:-

https://www.antiqueradios.com/forums...p?f=5&t=371085

73

Roger/G3VKM

Gridiron · 22nd Feb 2022, 10:29 pm

I do have one of these receivers with 2 coils C1 and C2 which seem to cover the FM broadcast band which is working, when I tried it today I could receive Radio 2 at reasonable quality presumably by slope detection.
The coils are in clear Perspex? containers glued together so don't come apart easily but I have drawn the attached diagram from what I can see.

wa4mnt0696 · 27th Feb 2022, 1:23 pm

Thank you for the "C" coils details. That is a great help. I plan to do the base in fr4 glass epoxy board, less copper, and the covers from the bottom of some plastic tablet bottles, which look very close to the originals.

73's, ken

Scottart · 27th Feb 2022, 2:03 pm

There’s a couple of coils on eBay at present - don’t what frequencies / band they are.
Stephen

21st Feb 2022, 4:48 pm	#1
wa4mnt0696 Diode Join Date: Feb 2022 Location: Clarkdale, Arizona, USA. Posts: 2	National 1-10 VHF Regenerative Receiver Hello group, I have recently acquired a National 1-10 VHF Regen Receiver, mfg. date 2/22/1946. Originally it came six coil sets. Unfortunately the only coil I have is the "F" pair (30MHz-42MHz). I was wondering if anyone may have the plug-in details for the remaining "A" through "E" sets. Mechanically I can come close to the original designs, but need the turns count, and or, any additional component definitions. I have a copy of the original owners manual, but it is not descriptive in this area. Thank you in advance. Ken - wa4mnt Clarkdale, AZ

22nd Feb 2022, 2:07 pm	#2
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: National 1-10 VHF Regenerative Receiver Hi Ken, welcome to the Forum. While there are numerous HRO 5's in the UK, I've never seen or heard of anyone here owning one of the VHF sets you refer to. If you cannot find the data in the US, I wouldn't be hopeful that you'll have much luck in the UK. B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.

22nd Feb 2022, 5:06 pm	#3
G3VKM_Roger Heptode Join Date: Jun 2012 Location: Southeast Norfolk, UK. Posts: 773	Re: National 1-10 VHF Regenerative Receiver Hi Ken, There are some coil photos here:- https://www.antiqueradios.com/forums...p?f=5&t=371085 73 Roger/G3VKM

22nd Feb 2022, 10:29 pm	#4
Gridiron Heptode Join Date: Apr 2010 Location: West Midlands, UK. Posts: 663	Re: National 1-10 VHF Regenerative Receiver I do have one of these receivers with 2 coils C1 and C2 which seem to cover the FM broadcast band which is working, when I tried it today I could receive Radio 2 at reasonable quality presumably by slope detection. The coils are in clear Perspex? containers glued together so don't come apart easily but I have drawn the attached diagram from what I can see. Attached Thumbnails

27th Feb 2022, 1:23 pm	#5
wa4mnt0696 Diode Join Date: Feb 2022 Location: Clarkdale, Arizona, USA. Posts: 2	Re: National 1-10 VHF Regenerative Receiver Thank you for the "C" coils details. That is a great help. I plan to do the base in fr4 glass epoxy board, less copper, and the covers from the bottom of some plastic tablet bottles, which look very close to the originals. 73's, ken

27th Feb 2022, 2:03 pm	#6
Scottart Pentode Join Date: Apr 2005 Location: London, UK. Posts: 205	Re: National 1-10 VHF Regenerative Receiver There’s a couple of coils on eBay at present - don’t what frequencies / band they are. Stephen Last edited by Cobaltblue; 27th Feb 2022 at 2:06 pm. Reason: Euphemism for eBay