FT101ZD MK3 PA Query - UK Vintage Radio Repair and Restoration Discussion Forum

BrianS1 · 26th Nov 2014, 9:04 am

Re: Yeasu ft101zd (Yaesu FT101ZD).
L9 connections in the FT101ZD Mk 3 manual are shown as connecting between moving contact of RL2 and PL259 type socket antenna input.
On my FT101ZD I found the " RL" end of L9 connected to the RL2 coil D6 cathode end.

The transceiver had been used in transmit mode.

The addition of L9 was a modification beginning with production lot 4 and was not shown connecting to coil of relay in manual.

I am puzzled and before I solder L9 to the mc pin on relay RL2 would welcome any comments.

GW3OQK Andrew · 28th Nov 2014, 4:49 pm

Brian, my L9 was connected from one end of the main coil L1 to the relay. The moving contact went to the coax socket. Not as shown in the diagram.

I say was because I have scrapped it as far as TX was concerned because the valves and their replacements flashed over inside as soon as I tried transmitting. Because it would not work QSK it did not suit me anyway.

73
Andrew

BrianS1 · 30th Nov 2014, 5:56 pm

Andrew, thanks for your reply/comments.

I have since removed the relay and drawn it up as I couldn't find it on the net.
I have now rewired it to the circuit diagram in the manual which does seem to make sense as it is after all a transmit / receive changeover relay and for the coax input to to be connected via L9 to the coil just does not make sense.

I am still wondering how I managed to transmit without any apparent problems ?

If anyone can shed any more light on this I would be pleased to hear.

26th Nov 2014, 9:04 am	#1
BrianS1 Retired Dormant Member Join Date: Jan 2009 Location: Fareham, Hampshire, UK. Posts: 14	FT101ZD MK3 PA Query Re: Yeasu ft101zd (Yaesu FT101ZD). L9 connections in the FT101ZD Mk 3 manual are shown as connecting between moving contact of RL2 and PL259 type socket antenna input. On my FT101ZD I found the " RL" end of L9 connected to the RL2 coil D6 cathode end. The transceiver had been used in transmit mode. The addition of L9 was a modification beginning with production lot 4 and was not shown connecting to coil of relay in manual. I am puzzled and before I solder L9 to the mc pin on relay RL2 would welcome any comments.

28th Nov 2014, 4:49 pm	#2
GW3OQK Andrew Pentode Join Date: Apr 2011 Location: Swansea, Wales, UK. Posts: 144	Re: FT101ZD MK3 PA Query Brian, my L9 was connected from one end of the main coil L1 to the relay. The moving contact went to the coax socket. Not as shown in the diagram. I say was because I have scrapped it as far as TX was concerned because the valves and their replacements flashed over inside as soon as I tried transmitting. Because it would not work QSK it did not suit me anyway. 73 Andrew

30th Nov 2014, 5:56 pm	#3
BrianS1 Retired Dormant Member Join Date: Jan 2009 Location: Fareham, Hampshire, UK. Posts: 14	Re: FT101ZD MK3 PA Query Andrew, thanks for your reply/comments. I have since removed the relay and drawn it up as I couldn't find it on the net. I have now rewired it to the circuit diagram in the manual which does seem to make sense as it is after all a transmit / receive changeover relay and for the coax input to to be connected via L9 to the coil just does not make sense. I am still wondering how I managed to transmit without any apparent problems ? If anyone can shed any more light on this I would be pleased to hear.