UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 6-gang FM stereo tuner heads

G0HZU_JMR · 5th Dec 2022, 12:24 am

I did manage to finish the RBW filters in the HP8568B late last night and it's been on all day on a soak test. Here's an image of it showing a 5kHz span.

Sadly, my mobile phone can't capture how crisp and sharp the CRT is now. I also tweaked the CRT when I had the covers off. It looks quite vibrant and really sharp now. This analyser was at its very best when looking at the close to carrier phase noise on VHF and UHF frequency synthesisers as it has very low close to carrier phase noise on a 5kHz span like this.

I had a go at making the TSC-2-1 splitter this afternoon. I added the RC network, and it does give about 70dB isolation at 100MHz. However, the isolation null is very termination sensitive so it would have to be adjusted for peak isolation with the DUT attached at the sum port.

5th Dec 2022, 12:24 am	#336
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: 6-gang FM stereo tuner heads I did manage to finish the RBW filters in the HP8568B late last night and it's been on all day on a soak test. Here's an image of it showing a 5kHz span. Sadly, my mobile phone can't capture how crisp and sharp the CRT is now. I also tweaked the CRT when I had the covers off. It looks quite vibrant and really sharp now. This analyser was at its very best when looking at the close to carrier phase noise on VHF and UHF frequency synthesisers as it has very low close to carrier phase noise on a 5kHz span like this. I had a go at making the TSC-2-1 splitter this afternoon. I added the RC network, and it does give about 70dB isolation at 100MHz. However, the isolation null is very termination sensitive so it would have to be adjusted for peak isolation with the DUT attached at the sum port. Attached Thumbnails __________________ Regards, Jeremy G0HZU