UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Kenwood TS-520SE Transceiver overhaul notes Pt1

G8UWM-MildMartin · 15th May 2019, 12:34 am

Quick update:
Neither shaft coupler bought fits in the PA cage; they foul the neutralising variable capacitor and the hole, but both are suitable replacements for the one on the Load control which only had minor cracks to one hole and responded well to a drop of superglue and is OK on the bandswitch until a replacement arrives from China ("1Pcs 6mm Shaft Coupling Rigid Coupling Coupler Motor Connector + Spanner"), which is solid brass.

The RF board aligned perfectly well following the instructions in the user manual (Drive control at 12 o'clock, not peaked on RX as per the video) giving consistent receive sensitivity of the marker and CW output power across all bands ("CAR" carrier control needing to be progressively in with frequency to give ALC reading in range, as expected.)

No SSB TX was due to "PROC" switch needing some magic squirt.

The relay on the AF board seems to be behaving most of the time now, but will still be replaced when the new one arrives, and the board inspected for fractured joints while it is out.

I'm enjoying this so much I could be tempted to think about an aerial in the back yard.
(Haven't been on HF since operating G3GIZ/P on NFD in the early '80s, when this was made!)

15th May 2019, 12:34 am	#19
G8UWM-MildMartin Heptode Join Date: Jan 2004 Location: Stockport, Greater Manchester, UK. Posts: 827	Re: Kenwood TS-520SE Transceiver overhaul notes Pt1 Quick update: Neither shaft coupler bought fits in the PA cage; they foul the neutralising variable capacitor and the hole, but both are suitable replacements for the one on the Load control which only had minor cracks to one hole and responded well to a drop of superglue and is OK on the bandswitch until a replacement arrives from China ("1Pcs 6mm Shaft Coupling Rigid Coupling Coupler Motor Connector + Spanner"), which is solid brass. The RF board aligned perfectly well following the instructions in the user manual (Drive control at 12 o'clock, not peaked on RX as per the video) giving consistent receive sensitivity of the marker and CW output power across all bands ("CAR" carrier control needing to be progressively in with frequency to give ALC reading in range, as expected.) No SSB TX was due to "PROC" switch needing some magic squirt. The relay on the AF board seems to be behaving most of the time now, but will still be replaced when the new one arrives, and the board inspected for fractured joints while it is out. I'm enjoying this so much I could be tempted to think about an aerial in the back yard. (Haven't been on HF since operating G3GIZ/P on NFD in the early '80s, when this was made!)