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

G0HZU_JMR · 10th Mar 2021, 3:04 am

I'm not sure I'd go for a Kirkby kit but lots of people seem happy with them.

I'm still confused by your VNA plot of s11 because now it looks about right for a healthy directional filter. Could it be that despite the broken connection there is still sufficient coupling capacitance there to make the broken connection act as a DC block at 2GHz? This would mean the resistors are still there at 2GHz. If so, adding the piggy 50R resistors might make it worse...

10th Mar 2021, 3:04 am	#100
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: Spectrum Analyser TR4172 I'm not sure I'd go for a Kirkby kit but lots of people seem happy with them. I'm still confused by your VNA plot of s11 because now it looks about right for a healthy directional filter. Could it be that despite the broken connection there is still sufficient coupling capacitance there to make the broken connection act as a DC block at 2GHz? This would mean the resistors are still there at 2GHz. If so, adding the piggy 50R resistors might make it worse... __________________ Regards, Jeremy G0HZU