Yaesu FT101Z motorboating sound - UK Vintage Radio Repair and Restoration Discussion Forum

keogaida · 28th Sep 2019, 5:00 pm

When I switch on my Yaesu FT101Z, on main bands ie 20m, 40m or 80m etc. on receive I get a sound like motorboating which seems to be tunable, any ideas what the problem could be?

Thanks

M3VUV51 · 29th Sep 2019, 5:05 am

if it was me the first thing i would check is all the psu voltages against the schematic,then caps for high esr.

Richard675 · 29th Sep 2019, 12:28 pm

Fist thing to do is plug in a dummy load then see if the noise is still present.

keogaida · 29th Sep 2019, 8:07 pm

Hi, Checked out with Dummy load connected, Same symptoms. Thanks Richard. I'll now start checking out the voltages and capacitors it sounds like an electrolytic has gone o/c. need to source voltage values and some capacitors. Thank you M3VUV51

Richard675 · 29th Sep 2019, 8:45 pm

The old 101Z is prone to dodgy switches due to aging. I would give all of them a good working over before anything else especially the push button switch bank under the vfo

28th Sep 2019, 5:00 pm	#1
keogaida Retired Dormant Member Join Date: Mar 2017 Location: Airdrie, North Lanarkshire, Scotland, UK. Posts: 6	Yaesu FT101Z motorboating sound When I switch on my Yaesu FT101Z, on main bands ie 20m, 40m or 80m etc. on receive I get a sound like motorboating which seems to be tunable, any ideas what the problem could be? Thanks

29th Sep 2019, 5:05 am	#2
M3VUV51 Banned Join Date: Feb 2018 Location: Horncastle, Lincolnshire, UK. Posts: 203	Re: Yaesu FT101Z motorboating sound if it was me the first thing i would check is all the psu voltages against the schematic,then caps for high esr.

29th Sep 2019, 12:28 pm	#3
Richard675 Pentode Join Date: Jun 2009 Location: Braintree, Essex, UK. Posts: 170	Re: Yaesu FT101Z motorboating sound Fist thing to do is plug in a dummy load then see if the noise is still present.

29th Sep 2019, 8:07 pm	#4
keogaida Retired Dormant Member Join Date: Mar 2017 Location: Airdrie, North Lanarkshire, Scotland, UK. Posts: 6	Re: Yaesu FT101Z motorboating sound Hi, Checked out with Dummy load connected, Same symptoms. Thanks Richard. I'll now start checking out the voltages and capacitors it sounds like an electrolytic has gone o/c. need to source voltage values and some capacitors. Thank you M3VUV51

29th Sep 2019, 8:45 pm	#5
Richard675 Pentode Join Date: Jun 2009 Location: Braintree, Essex, UK. Posts: 170	Re: Yaesu FT101Z motorboating sound The old 101Z is prone to dodgy switches due to aging. I would give all of them a good working over before anything else especially the push button switch bank under the vfo