Can somebody help me to identify this component

[its4chris]

I have a problem with an IFR 3414 signal generator and believe the issue is with a component identified as IC64, MCL 1 138, JYM-4551-1 (image attached). Its possibly an RF relay from around 2002. Despite having a quite thorough internet search, still no idea.
Anybody know what this part is? A datasheet would be very helpful.
Thank you.
Chris

[Alex Eisenhut]

Looks awful close to this

https://www.minicircuits.com/pdfs/JYM-30H.pdf

maybe it's a custom part. What signals go in and out from there?

[its4chris]

Hi Alex,
Many thanks for the datasheet - it was a great clue! The mixer is now confirmed as functioning correctly, 860 MHz mixed with 860.25MHz to 1235 MHz giving 250KHz through 375MHz output. I am debugging using a 200MHz 'scope and could not see the h.f. signals when probing around. Just guessed the device was a relay from its shape as the low band of the generator was not switching correctly. I have now traced the fault to a biasing problem on a Darlington pair buffer.
Great fun debugging with just a block diagram and no schematic.
If anyone out there has a schematic for a Aeroflex/Cobham IFR3410 series generator, a copy would be greatly appreciated.

[CJay]

Hi Alex,
Many thanks for the datasheet - it was a great clue! The mixer is now confirmed as functioning correctly, 860 MHz mixed with 860.25MHz to 1235 MHz giving 250KHz through 375MHz output. I am debugging using a 200MHz 'scope and could not see the h.f. signals when probing around. Just guessed the device was a relay from its shape as the low band of the generator was not switching correctly. I have now traced the fault to a biasing problem on a Darlington pair buffer.
Great fun debugging with just a block diagram and no schematic.
If anyone out there has a schematic for a Aeroflex/Cobham IFR3410 series generator, a copy would be greatly appreciated.

I'd also greatly appreciate a copy as I have a 3413 that has low output, overheats and displays 'unlevelled'. I think the problems with mine are limited to the pushpull final amplifier so if there's anything I can help with by checking against mine, feel free to ask.

[rickells]

hi its4Chris & CJay,

I also have a broken Aeroflex IFR 3416 ( 6 GHz Signal Generator ) of the 3410 series.
Am looking for the Service & Maintenance manuals (Aeroflex had them all on CD-ROM's & print).

My issues are very similar to CJay's (No RF Output,  ERROR # 522).

Would appreciate contact with you both to put our heads together for repair of these Sig Gen's.

thanks

[CJay]

Aeroflex will supply the manuals but they're *expensive* and I don't believe they include schematics, they're just module level replacement manuals. (I would be grateful if someone could prove me wrong on that though) so I don't think they're worth having if you need to repair an item.

[Mkpirulo]

Hi,

I to have a 3413 that needs some work. Did you guys ever fix your units?
Schematics would be helpful, I'm currently trying to find my way using the 2025 maintanance manual.

Mike

[CJay]

Nope, the parts I *think* I need are covered by ITAR and the UK company with stock of them won't sell them to me.