Unaohm Field Strength Meter FSM 5988 - UK Vintage Radio Repair and Restoration Discussion Forum

majoconz · 26th Aug 2017, 10:40 pm

Hi Guys, this is probably not considered "vintage" but it's worth a try!

Anyone got a service manual or even just a schematic for this device. Dirt cheap on our local auction site, rather grubby externally but only dusty inside - given a good cleanup and switch cleaner on the pots and switches and it actually works quite well. The first mark on the level meter is 20dBuV but it's much more sensitive than that. Seems to have a TV tuner module inside and a reasonably large chip that's probably doing all the work. Frequency displayed down to 100kHz seems to be accurate. Continuous coverage from 46 to 860MHz. Case held together with Tinnerman nuts - all busted or missing - hopefully replaceable. Runs on 12 "C" cells and has a 5 minute timer on it which got me confused at the start! I thought it had an intermittant fault but it's intermittant on purpose!
Any help gratefully received - thanks.

karesz* · 27th Aug 2017, 12:50 am

Hi,
maybe here?
Regards, Karl

majoconz · 27th Aug 2017, 4:08 am

Thanks for that, Karl, but been there, done that. I was momentarily excited when I saw the "Service" heading - expecting to find a manual download, but no - they wanted to service the meter for 70Euros analysis the 80Euros/hour to fix it! Not counting P&P of course!

26th Aug 2017, 10:40 pm	#1
majoconz Heptode Join Date: Jan 2008 Location: Ashhurst, Manawatu, New Zealand Posts: 570	Unaohm Field Strength Meter FSM 5988 Hi Guys, this is probably not considered "vintage" but it's worth a try! Anyone got a service manual or even just a schematic for this device. Dirt cheap on our local auction site, rather grubby externally but only dusty inside - given a good cleanup and switch cleaner on the pots and switches and it actually works quite well. The first mark on the level meter is 20dBuV but it's much more sensitive than that. Seems to have a TV tuner module inside and a reasonably large chip that's probably doing all the work. Frequency displayed down to 100kHz seems to be accurate. Continuous coverage from 46 to 860MHz. Case held together with Tinnerman nuts - all busted or missing - hopefully replaceable. Runs on 12 "C" cells and has a 5 minute timer on it which got me confused at the start! I thought it had an intermittant fault but it's intermittant on purpose! Any help gratefully received - thanks. Attached Thumbnails __________________ Cheers - Martin ZL2MC

27th Aug 2017, 12:50 am	#2
karesz* Heptode Join Date: Jun 2010 Location: Zurich, Switzerland Posts: 538	Re: Unaohm Field Strength Meter FSM 5988 Hi, maybe here? Regards, Karl

27th Aug 2017, 4:08 am	#3
majoconz Heptode Join Date: Jan 2008 Location: Ashhurst, Manawatu, New Zealand Posts: 570	Re: Unaohm Field Strength Meter FSM 5988 Thanks for that, Karl, but been there, done that. I was momentarily excited when I saw the "Service" heading - expecting to find a manual download, but no - they wanted to service the meter for 70Euros analysis the 80Euros/hour to fix it! Not counting P&P of course! __________________ Cheers - Martin ZL2MC