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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 23rd Nov 2019, 10:13 pm   #1
Steve G4WCS
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Default A pair of Icom bricks

Picked up an Icom 260E a while ago. Superb radios.
I keep browsing the internet for possible bargains and managed to get a 260A for £25 with a tuning fault. Its had a couple of nights spent cleaning it up, and its now putting the E to shame, off with its knobs into the dishwasher I think.
The beauty with having a couple is its easier to compare voltages as its probably a dry joint or an expired cap on the control logic board.
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Old 24th Nov 2019, 10:04 am   #2
onewatt
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Default Re: A pair of Icom bricks

Hi Steve,
I have a 260, think itís also an ďAĒ with a tuning issue. I struggled to find info on the circuit at the time so I put it on the back burner. Iíll be interested to see what you find.
ATB
Chris
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Old 24th Nov 2019, 10:54 pm   #3
russell_w_b
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Default Re: A pair of Icom bricks

I have a 260E too: great set. I replaced the meter lamp with a green LED when it failed, which was a bit of a fiddle, and the only trouble I've ever had was a dodgy connection on one of the board plugs which (as I recall) prevented me running CW on 1W. But that was a long time ago and it's been fine since.
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Old 25th Nov 2019, 9:40 am   #4
Jon_G4MDC
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Default Re: A pair of Icom bricks

It's a pity that Icom have put up the manual minus the circuit diagram...
If you are still looking it can be found at mods.dk

It looks like the PLL runs on a 5.12 MHz crystal divided by 512 so PLL step frequency is 10kHz.
The mix down crystal is driven by a D to A to interpolate the 10k into 100Hz steps.

Are the tuning issues with the 10kHz steps or within each step?

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Old 25th Nov 2019, 11:38 pm   #5
Steve G4WCS
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Default Re: A pair of Icom bricks

Ill keep you posted on my findings.
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