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pricking around with a thermal camera, thought I may as well do an experiment.

because there is no other bar or similar that we normally see holding TO220 packages in close squeeze with their heatsink

Yeah this stuff isn't usual white/grey non-setting thermal compound for use on CPU's, etc. this is some sort of glue which provides the mechanical hold-down too.

Please see attached. I had to dismantle this PCB to repair a connector. I prised the FETs off this dried goo, which I guess must be some thermally conductive glue. is there any secret sauce to this, or could I just use any "RTV" setting silicone tube (like the tubes of goo that come with Furuno...

When I said of Falkalnds that "they use the 2m radio in exactly this way", I guess that I meant more that nobody in FI got precious about who was using a repeater so long as somebody associated with the radio had a license; children, wives, sisters, brothers, visiting sheep shearers, boatmen...

that amazes me. I thought the F course was pitched high, personally. especially the non pictorial stuff, like the legislation and ohms law/power law. I was surprised at the somewhat high level of numeracy and comprehension required, if the aim was to get schoolkids in.

interesting you say this. I have wondered about the precise definition of the "under supervision" part of the licensing conditions for these purposes. To be clear, "these purposes" are - general domestic logisitical comms. My lad, 13, is technically minded, genuinely wary of social media and...

yes agreed. I have mucked around with these mechanisms on the chinese products. In this case, the tone sequence only needs be sent once for each qso; it has the effect of causing the radio to alert (ring) and opening the rx mute. this will then idle for 20s or so, resetting within that period on...

Good point, I did not make that clear. this is so that a licensed amateur operating /p with a handie can call domestic base QTH where there is a trx in a family area (kitchen) which might otherwise be an audio nuisance on its "normal" noise squelch. base trx is also operated by licensed amateur...

At the risk of getting booted, for being completely off the topic of UK Electric, but also because I know there are a few honey roasters on here; Is sending DTMF sequences through a licensed 2m repeater in UK "compliant" with amateur licensing? "why would you want to?" in this case, to...

Thanks for this, I have emailed those 2 addresses the details.

Well I attempted to inform the DNO which appears to be UK Power Networks, via their website but gave up when it seemed to be guiding me towards being "responsible" for my information (MPAN number was not optional). I guess this makes some kind of sense to avoid nuisance hoaxing, but I got the...

is this normal? it appears to me that there is likely 400VAC between adjacent conductors in this photo, with conductors bridged by at times damp foliage.... which on the face of it seems quite a fire risk. but this is clearly operable. what am I missing?! (location is cambs UK)

Saw one of these tother day (see photo) I've seen a few like this over the years, and it seems to be always the L conductor that cooks up. whenever Ive seen this, it's been in "known dodgy" situations (ie, where unregulated DIY shenanigans are continuously ongoing, with operators who are...

why not two spoons in close contact? arcing could feasibly lead to nasty smoke, fumes or even metal fire (or arcing to the cavity) which indirectly could cause significant damage. but just arcing within the cavity - that's fine (??) - it represents energy being consumed (turned to heat) within...

I tend to agree with you but that's NOT WHAT WE ARE ABOUT IS IT. Get with the program: repair don't replace. there is a war on you know. Also this is a sexy unit from a fitted kitchen, so a £30 Tesco's unit is not really a replacement in this case. (not my kitchen, a friend's with a much...

Anyone know what the actual difference between a 2M240H(PA) and a 2M240H might be? I have a duff 2M240H(PA) from a Siemens branded microwave. £140 for the genuine part from the authorised spares vendor, £60 for generic on ebay clearly the cheaper one is more attractive.

by the way the relay's sole function is to jumper the trafo in some simple way that I didnt bother to follow for the cranking amps function

I wondered that too but on close inspection, the relay's coil inside was tape-wrapped and on the tape was stamped 240VAC.

yeah I wondered if they were zeners. 2 diodes checked out OK 0.5V forward & open cct revers. the other 2 were dead short. replaced them with 1N3094's tried it. relay chattered away like it didnt have enough pull. coil meters at 5K. think the coil must have gone o/c. replaced it with a contactor...