UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - BBC Radio 4 long wave reception problems etc.

G6Tanuki · 24th Aug 2017, 7:20 pm

Ah, I thought you'd done the head-unit upgrade yourself.

Modern car-antennas with amplifiers work badly on FM when not powered-up (pickup on the coax?) but pretty much not-at-all on LW under the same conditions!

I've just tried tuning to R4LW on my kitchen-radio PCR and the sibilance is definitely gone, though the PCR has its IF stages aligned for maximum-selectivity so the high-frequency components of the received signal get pretty effectively deleted anyway. I only noticed the sibilance in the past when the receiver was slightly off-tune.

24th Aug 2017, 7:20 pm	#92
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Radio 4 198 sibilance Ah, I thought you'd done the head-unit upgrade yourself. Modern car-antennas with amplifiers work badly on FM when not powered-up (pickup on the coax?) but pretty much not-at-all on LW under the same conditions! I've just tried tuning to R4LW on my kitchen-radio PCR and the sibilance is definitely gone, though the PCR has its IF stages aligned for maximum-selectivity so the high-frequency components of the received signal get pretty effectively deleted anyway. I only noticed the sibilance in the past when the receiver was slightly off-tune.