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hpr_transcripts/hpr4232.txt

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+Episode: 4232
+Title: HPR4232: Replacing backup batteries in my Kenwood TS940S HF Radio Part 6
+Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr4232/hpr4232.mp3
+Transcribed: 2025-10-25 21:47:34
+
+---
+
+This is Hacker Public Radio Episode 4232 for Tuesday the 22nd of October 2024.
+Today's show is entitled Replacing Backup Batteries in My Kenwood DS940SHF Radio Part 6.
+It is part of the series' Ham Radio. It is hosted by Mr. X and is about 22 minutes long.
+It carries an explicit flag. The summary is, Part 6 is the final episode of deals with fitting the new replacement PLL backup battery.
+Hello and welcome Hacker public radio audience. My name is Mr. X and welcome to this podcast.
+As usual, I would like to start by thanking the people HPR for making this service available to us all.
+HPR has an invaluable service on these heritage tubes.
+HPR has a community podcast provided by the community for the community. That means you can contribute to it.
+If you all give 1 episode a year, we have more shows than we know to do with.
+If you are looking for inspiration ideas visit the website, the HPR website and if you go to the GIFs Show section, there is a whole host of ideas you can come up with.
+You might even enjoy it. It is really quite a low bar. Just pick up a microphone and record something.
+Using a phone, MP3 plate, you have got one tablet, PC, laptop, whatever. Anyway, this episode is Part 6 of my series on replacing backup batteries in my aging amateur radio set.
+My aging can with TS940S amateur radio set. This Part 6 consists of fitting the battery on the previous episode.
+The previous episode I removed the old backup battery on the PLL board. This episode I am going to fit the new battery into PLL board.
+We will see how it goes from there. I will just take it from there.
+Now whether to put the new battery, here it is.
+Just check how these pillars look reasonably clean. That will be OK.
+Positive is on the left hand side, negative is on the right.
+I need to prepare the battery by attaching the battery.
+I have actually got a blue wire, I could link it with that I suppose, but then it will be supported on one side.
+I think I will just do the same with the last time and attach a resistor leg to it and then bend that into place.
+That seemed to work quite well, so I will do the same again.
+I should just check. This is in the wrong order because I should check the battery voltage of the new battery.
+I did not check the old battery, which unbelievably after about 40 years we are still showing 3.5 volts.
+Quite astounding, yeah 3.35 volts and the new one 3.35.
+Was it 3.5? It was 3.3 as well, I can't remember.
+I am sure it was 3.3 actually.
+Right, so the plus, which side is the plus?
+Not sure. Oh yes, the plus is in the top, in this case.
+That would be that way plus, right.
+I need to take this resistor and I will leave it at that.
+It is basically a normal carbon resistor basically.
+I am just going to bend that hook on the end of it with a pair of pliers.
+Then fit that to place that through the whole of the terminal on the battery.
+That is that on there.
+Then I need to use a pair to squeeze it, shut the hook so that it stays in place.
+That is that. That is good. That is okay.
+That is fine to want to do now, solder that in place now.
+We can sit it on the plastic of my glass I suppose.
+Do they do with helping hands or something like that to hold it in place?
+Balance it over the edge of the desk and wonder, that is not great.
+A pair of pliers on that will do.
+That will do nicely.
+Remember I scraped the end of the lead for the resistor so it will solder properly.
+I could have tinned it first but then it makes more difficult to bend it into place.
+I decided to do that.
+I am just applying some solder.
+Do we touch more solder?
+I am going to find this solder.
+That might be okay.
+I will check.
+Where is my eyeglass?
+Oh yes, that is a good joint.
+I will bend this up.
+I will just see before I bend it up.
+Is that a photo key?
+Oh yes.
+Do I bend this up or do I leave it as it is?
+I think that might be okay as it is.
+I think I might leave that.
+I will take a photograph so you can see what I have done with the resistor and the battery.
+I will show you it in place.
+I will just pause this now.
+I think I shall just place that onto the pin on the pin.
+I think that is going to work fine.
+That is looking good.
+Now that that is in place, I am going to solder that in place.
+That is 1 and that is plus, definitely plus to the correct side plus.
+I will just apply a little bit of solder.
+I am not sure I am liking this.
+I swapped a bit of solder.
+I have got various pieces of solder.
+I am not sure I like this fine stuff.
+It is so fine that you need to apply a lot more than you normally would to fill the joint.
+I am going to use my eye glass because I cannot see what I am doing.
+I think I will just pause this and do this without the well recording because it is a bit
+fiddly.
+That is the battery soldered in place.
+I am not terribly happy with the connection on the right hand side.
+I think I have a problem getting the solder to flow properly around the connections on
+the first battery actually.
+Strangely, the certainly scraping the resistor on the resistor before fitting it to the battery
+has been a huge difference and the solder has flowed around that nicely.
+Also onto the post.
+I could have cut the lead a bit shorter but I did not have enough lot of room to spare
+and I did not want to leave it too short and you cannot add a bit more when you take too
+much off.
+There is no harm in it being a bit too long on the left hand side.
+You will see from the picture a bit the right hand side.
+There is actually, if you look closely you can actually see a gap with the solder
+so there is no flowed properly around.
+The battery does seem to be securely attached to the right hand side even although the solder
+ring is not fantastic, it will be okay.
+There is not going to be, you know, transport that down, roads or anything like that.
+It is going to be sitting in this room not moving so it should be fine.
+I am going to leave that as it is.
+I am a bit scared that I will overheat something or damseling it.
+It is attached, that is the main thing.
+It is just a matter of putting everything back together again I think you really know.
+I need to get the top cover back onto this metal plate back on again and it was quite interesting
+because I did not think I would be able to get that off with just six connections off but
+you know, the tapping video was absolutely right.
+You can do it by just removing the six connectors and leaving the other ones be up and to watch
+this underneath and not catching any cables.
+It needs to go up and over, doesn't it?
+Yeah, okay.
+This could be a bit fiddly.
+Okay.
+Mm-hmm.
+Okay, is that it is close.
+I should just drop into this.
+That does not feel right somehow.
+They do not trap any wires.
+That is the other thing I have caught.
+Oh yeah, there is wires everywhere.
+Crikey.
+You said to watch not to trap wires on the front part.
+I would say this is worse.
+I do not have any problems with the front being trapped.
+It is more this metal can.
+I think.
+All right.
+Is that it?
+And please.
+Mm-hmm.
+Maybe.
+I think I am going to look all the way around and make sure there is no connections trapped.
+That looks okay.
+On the side does that look all right?
+Yep.
+That looks okay.
+What a bit on the front face.
+It is in and caught.
+Yeah.
+That is not in place actually.
+Goodness.
+I thought it was.
+That is not quite right yet.
+Mm.
+Okay.
+That is not right.
+There is something not right.
+Yes.
+There is cables.
+Okay.
+That is all right there.
+Try that.
+Is that it?
+Ah.
+There we go.
+No.
+Something not right.
+Definitely not.
+Why is that not?
+Mm.
+This is a bit worrying.
+I do not see anything trapped.
+That is something properly on the base there.
+Yes it is.
+So, I should be able to get the other side on that case.
+Is it here?
+Is it the front?
+Something is different.
+Not right.
+Yeah.
+I am going to have another wee look at this.
+Mm.
+It feels like it is rocking as if something is caught jammed underneath.
+I am going to have another closer look at this to stop recording.
+I have another wee look.
+Okay.
+So, it turns out there is a lip on the far end of the box and it was catching that.
+There is nothing more than that.
+I just squeezed the box in slightly and in the middle at the rear and it just dropped into
+place.
+That is all it was.
+It was just slightly catching as I was pushing it down.
+I was just a bit really quick.
+Worried that I was catching a wire or something like that and trapping it.
+That would be disaster because you would get quite sharp edges on that middle box and it
+would have sheared the thing.
+That is one screw in and I am going to try and put the screws in and kind of diagonally
+opposite one another.
+A kind of colleague telling me that is how you should fit screws.
+I think he experiences of working on cars and stuff.
+You don't distort the item of screwing it down onto.
+I have no experience of that.
+I think I have two spare plugwits as far as I can go.
+Your filter.
+Stuff like that.
+That is three screws in for screws.
+For the top lid.
+Top silver lid.
+Five screws.
+Because I am doing all the easy ones, I am just putting them in loose.
+One, two, three, four, five.
+Six.
+I definitely don't want to.
+Drop a screw into the radio at six.
+Seven.
+I can manage that without dropping it.
+I think so.
+Fiddly this one.
+Seven.
+There is wires going to be here to work careful.
+I don't nip any of them.
+I can light this.
+Room is horrendous.
+I can put my head over the radio and then suddenly it all goes dark.
+Seven.
+And then the last screw.
+Eight.
+So that wasn't so bad at all.
+I think breaking the job down helps.
+If you have got the luxury of leaving the job.
+Or you have got the luxury of having the whole day to work on something.
+Or you have got the room just to leave your tools and stuff lying about the place then.
+On your bench, whatever.
+That is fine, but I don't have the space and the luxury for that.
+So one.
+That is all now.
+One.
+I'll just give them a tighten up.
+Two.
+Three.
+Four.
+Five.
+Oh.
+Wait a minute.
+Oh no.
+Okay.
+Six.
+Seven.
+Eight.
+I'm just going to go through any more looking because I'm asked one.
+One.
+Two.
+Three.
+Four.
+Five.
+Six.
+Seven.
+Eight.
+They're all tight.
+That's good.
+Not too tight.
+Not too tight enough.
+Right.
+So I was thinking that the connectors, I can't get the connectors back onto the side of the
+unit, but then I realised that the connectors got attached to the speaker, not to the speaker
+unit, not the silver box.
+So that's fine.
+Okay.
+The speaker, rotate it back and just into place.
+Now.
+How does that go?
+As you're taking, as you looked at my photographs before, how does that fit?
+That's a bit tight for speech.
+I should have paid more attention to this when I was taking it out.
+I think again, I'll pause the recording and get this fitted and then come back because
+this is just a bit boring.
+I can concentrate on what I'm doing here.
+So that was quite interesting.
+I was trying to get the speaker back into position.
+I know it's something underneath and somebody had soldered a couple of old wires onto the
+speaker and then just cut them off and put a bit of tape on them.
+So yeah.
+There's obviously been a few, there's opened a few times and I couldn't know why they'd
+have two speakers wires attached.
+There's all kinds of outputs on the back of the radio to get audio from the radio.
+I'm not quite sure why they did that, but interesting nonetheless.
+I actually removed them anyway in that.
+So we don't want that to short out or to go wrong at some point.
+So it just took two minutes.
+So that's the all the circuits back in place and the speaker back in place.
+I thought I might have to use my old trick with them.
+Blue tack or a equivalent type thing to stick on into the screwdriver.
+It's a chewing gummies type stuff.
+You can put your screw on on then they are screwed over and hold it in place where I'm trying to get down a deep recess
+because the screws are a bit difficult to get in.
+I've got a kind of magnetic screwdriver that I was able to do with that.
+So that's that.
+Now, probably having the screws I've got left to do.
+Yes, I've only got the case screws defect.
+I think what I'll maybe do is I'll fit the top, just place the top cover up or just make sure everything's having looks okay all the things are in place.
+That's fine, that's the wrong there.
+The border of the missing screw, I've just noticed that it's not even screwed down properly.
+Let's say the screws are all loose.
+Can I take them up further?
+No, I don't know.
+Yeah, I'm going to leave that alone.
+I want to do the minimum amount of modifications to this you're doing because I break something.
+So I don't think the screws will go down any further.
+So whether they're not the right screws or something's not right, but they're that.
+It's to secure anybody, so that's the main thing.
+I'll leave the border alone.
+Put the cover on.
+And I mainly push the AB key while powering it on.
+Because the PLL will have lost all its settings and whatnot and it might get a bit confused.
+We'll see.
+Oh, of course, there's a ton.
+I've mentioned that, there's a ton, I think I have.
+Oh, she was.
+Right, that's that.
+Make sure it's turned off, it is.
+And we'll put the mains lid in.
+I'll just put that antenna in just in case it goes into task.
+I'm just stupid like that.
+It shouldn't, just in case.
+It means that there's a load in the antenna.
+And it won't damage the outputs.
+Yeah, that's because I'm quite delicate.
+Right, three, two, one.
+Well, all seems okay.
+7.1642.
+So there we go, that's fucking fine.
+Wow, I can't believe it, good, good.
+So I'll let you move it again and put screws in and what the final screws in.
+Put it on properly.
+So there you go, that's fucking fine.
+Wow, I can't believe it, good, good.
+So I'll let you move it again and put screws in and what the final screws in.
+It's on properly.
+But I won't bore you with all that.
+I think it's probably enough.
+These are going to be long enough as it is.
+I'm not sure whether I'm going to have to split them up because they're going to be too long with the recordings.
+But I hope you've got something out of it.
+If nothing else, you hear this.
+When you don't properly prepare, you don't have the space, you don't have the time.
+How things can quickly go wrong.
+And that doesn't damage anything, we're just working.
+And hopefully I've saved it from almost certain death by corrosion from an internal battery.
+I can't believe that, a 40-year-old battery, and it's still operational, if leaky.
+So yeah, I think that's all I've got for you just now.
+So thank you very much.
+Or so I thought anyway.
+However, later on after they put the covers back on the radio and turned it on.
+And I thought, it was maybe actually a day or so later I thought, that sounds a little quiet.
+Why is the fan not coming on?
+So there's a fan.
+I think that might actually be two fans.
+There's certainly one fan anyway.
+And normally, under normal circumstances, if you put the radio on every few minutes,
+this fan comes on gently and goes off again, it cycles off and on.
+And I'm not entirely, I haven't seen great detail.
+But it's not, I don't think it's for the PA, you know, the power output stages.
+Although maybe a fan for that separate, I'm not sure.
+I think it's just for the power supply section.
+And anyway, it's not, it's no longer switching off and on.
+So it looks like something has happened and it's mysterious that it happened after I pulled the radio up.
+So I'm guessing I've done something, broken something.
+So I've maybe trapped a wire or something like that.
+So obviously, further investigation will be required.
+So when I got a chance, I can turn it on for five or ten minutes or so,
+but then it starts to get a bit warm at the back.
+And I wouldn't want to damage anything.
+So that's a bit unfortunate.
+It's actually worse than when I first started.
+So that's good.
+There's always a risk that can happen.
+Of course, never you take something to bits.
+The more complex it is, the more likely are to damage it, I suppose.
+But I haven't given up all hope by any means.
+I'm going to have another look at it at some point when I get a chance.
+Maybe we'll be next Christmas when I get a chance to get a bit of spare time.
+I don't know.
+But anyway, I think that's about it for this episode.
+In this series, and I hope you all enjoyed it.
+And I'll catch you later.
+If you've got any comments, you can contact me at MrX,
+at hpr at googlemail.com.
+That's MRX, AT, HPR,
+the at symbol googlemail.com.
+So until next time, thank you and goodbye.
+You have been listening to Hacker Public Radio,
+and Hacker Public Radio does work.
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+If you ever thought of recording podcasts,
+you click on our contribute link to find out how easy it really is.
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+On the Sadois status, today's show is released
+under Creative Commons Attribution 4.0 International License.