UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Metropolitan · 9th Mar 2012, 9:08 pm

Hello Chris,
According to the relevant Air Publication, both versions of the R1392 (A and D),used the same IF of 4.86Mhz. It was the Navy version, 62H, that used the higher frequency. (Dont know why the Navy set was also described in an AP) The versions B and E were merely tropicalised versions of the A and D.
The frequencies I was looking for were 6405, 6533, 6549, 6579, 6969, 6979, and 6942 khz.
The crystal frequencies listed in the AP for testing & aligning dont work out exactly to the formula they give. I mentioned this to a stallholder at Newark Aerojumble and he said some tolerance was acceptable. So perhaps the dont need to be spot-on? As I said in my first post, I dont know much about Xtals.
PS, Sean mentioned installing a DDS VFO. What is it

Thanks, Harry.

9th Mar 2012, 9:08 pm	#10
Metropolitan Retired Dormant Member Join Date: Jan 2012 Location: Worksop, Notts. Posts: 5	Re: R1392 Crystals Hello Chris, According to the relevant Air Publication, both versions of the R1392 (A and D),used the same IF of 4.86Mhz. It was the Navy version, 62H, that used the higher frequency. (Dont know why the Navy set was also described in an AP) The versions B and E were merely tropicalised versions of the A and D. The frequencies I was looking for were 6405, 6533, 6549, 6579, 6969, 6979, and 6942 khz. The crystal frequencies listed in the AP for testing & aligning dont work out exactly to the formula they give. I mentioned this to a stallholder at Newark Aerojumble and he said some tolerance was acceptable. So perhaps the dont need to be spot-on? As I said in my first post, I dont know much about Xtals. PS, Sean mentioned installing a DDS VFO. What is it Thanks, Harry. Last edited by Metropolitan; 9th Mar 2012 at 9:13 pm.