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Lee Hanken
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hpr_transcripts/hpr2867.txt
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Episode: 2867
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Title: HPR2867: The Kenwood TS940S Automatic Tuning Unit
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Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr2867/hpr2867.mp3
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Transcribed: 2025-10-24 12:30:52
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---
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This is HBR episode 2867 entitled The Kenwood DS-940 Automatic Tuning Unit and is part of the series HAM Radio, QSK, It is hosted by MrX, and is about 13 minutes long, and carrying an explicit flag.
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The summary is I cover the automatic tuning unit on my Kenwood DS-940 ReconF from HBR 2668.
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This episode of HBR is brought to you by an honesthost.com, get 15% discount on all shared hosting with the offer code HBR15, that's HBR15.
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Better web hosting that's honest and fair at an honesthost.com.
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Hello and welcome Hacker Public Radio Audience. My name is MrX, and welcome to this podcast.
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As usual I'd like to thank the people at HBR for making this service available to us all.
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HBR as a community led podcast provided by the community for the community.
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That means you can contribute to why not pick up a microphone and give it a go.
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We'd all love to hear something from you. If all contributed they below the shows.
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Right, this is one of my ad hoc shows.
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It comes from response that I got a comment back from one of my previous shows.
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It's taken me this long to get around to kind of reading it, and I'm quite bad at replying to comments.
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And it's regarding, let me just see what shows are now.
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It's regarding HBR2668 explaining the controls on my amateur HF Radio Part 3.
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And it comes from, comment is from Michael.
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And he was basically saying that it would have been really nice to hear.
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I mentioned something about the automatic tuning unit on my amateur HF,
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came with TS940S Radio, and that's quite interesting to hear, but I'm not going to do it.
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Well, the reason for that was that, as most of the time is a case, I was short on time.
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And to do the series, it was all recorded in a one hour, basically.
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And I was kind of desperate to get to the end of it and not have to stop in the middle and add a bit on the end.
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I guess what I could have done is just record the whole thing and say,
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I'm going to set the certain tier and at a later point in time, record it, I suppose,
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but I was just a bit short on time.
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So I've got a little bit of time today, so I thought I would give you a little treat
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and let you hear the automatic tuning unit on my came with TS940S.
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So I've had to, as I previously said, my amateur HF Radio Station can cause interference
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and set downstairs, nobody else is in the house, so I had to unplug the power cord
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from my television set, so it doesn't power itself on, which is a bit bizarre,
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but it does, it powers itself on if I start transmitting really strange.
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So it's obviously RF getting in somewhere, but it's unplugging and it's fine.
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This doesn't seem to affect anything else in the house.
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So, and the next problem I have is that my PC doesn't, the PC's not near the radio
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and my headphones, I've got, I'm wearing headphones with a boom microphone,
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it's a gamers headset, very cheap thing, nothing expensive at all.
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And it won't reach the radio, so I'm currently using an old Samsung netbook thingy,
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a really old thing that it runs the Ubuntu and Audacity.
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I'm running Audacity just now and it seems to run it very nicely,
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so that's what we're using, our transfer to the PC and edit it at the end.
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But anyway, I digress greatly.
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So, I've got the radio here in front of me and I'll just click it on.
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Yeah, so it took a while to come on as you noticed.
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So that's it on and I'll just turn the volume down and let's just see.
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Now, I've just tuned it up just to make sure it was working before I recorded this.
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And it does indeed still work.
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It's very mechanically and mechanical and there's really,
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a lot of delays and kicking and groaning as a cogs turn round and whatnot inside the thing.
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And I did think, it's not, I mean, I don't oil it, I don't do anything to it.
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It's amazing, it wasn't jammed.
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It was a bit slow turning when I first tried it, but anyway.
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So, we're currently on 7.19o, 7.19o megahertz.
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So if I just push my voice button, oh no, that's the wrong button.
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It's this one here, isn't it?
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7.19021.
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So there you go, that's where we are.
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That's where I tuned it up on.
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So, my antenna, which is in the loft, it's a halfway dipole,
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it's just two pieces of wire, basically.
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It won't cover the full, if, um,
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full split of the band, which is a 40 meter band, 7 megahertz,
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as I've got a wavelength of approximately 40 meters,
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which is why you call it the 40 meter band.
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And, um, so, if I tuned it to kind of round about the centre,
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which is 7 megahertz, so we'll go down from 7.2 to 7.
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I'll just turn that down, or thereabouts.
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There's nothing but noise, rubbish on at the moment,
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there's nothing to, interestingly, let's not just let you hear
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there's a spinning thing around down.
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And then, something there.
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I've got that wrong, sorry, I'm going to, the centre is 7,
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yes, 7.1, isn't it?
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So, because the band is 7 megahertz, that's right.
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So, between 7 and 7.2, so 7.1 is kind of in the middle.
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So, if I, and I just check, there's nothing there.
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So, there's, there's, um, the ATU button,
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it's called, it's, um, it's, the, the legend on it is,
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AT.T, antenna tuning unit, dot T, all the T sounds for,
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but, um, yeah, so, when I push that button,
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it must change the receive path in the radio,
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and you hear a, I like clicks from the receiver,
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but from the, from the relay clicking inside the radio.
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And, it sounds funny, if, if, if there have been a,
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um, a conversation on, you could have heard it,
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but there's really nothing on the band,
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it's just very nice, it's very noisy just now.
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But, when you push it, it, it, it says, um,
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antenna tuning unit, antenna tuning auto tune ready,
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and it, and it, maybe stays for five seconds,
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and then reverts back to, it's normal states.
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You want to go so long to transmit,
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once it's transmitting, that'll then time tune, tune up the radio,
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but if you don't transmit within a set number of seconds,
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it will, uh, drop back out.
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So, I'll just turn the volume up so you can hear it,
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and then I'll push the button, so you can hear the,
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maybe hear a difference in the audio,
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you maybe won't, I don't know.
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So, we're going to push it now.
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That's it.
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And, that's it, go back again.
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So, you can probably hear it switching from one to the other.
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So, I'll do that again.
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So, you can hopefully hear the, hear the difference there.
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Um, so, what I've got to do,
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I'll just pick up the, the hand of microphone here,
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and, uh, what I'll do is, I'll, uh,
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push the AT.T key,
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and then within five seconds or so,
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push the, um, the, uh, PTT switch,
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the switch on the side of the microphone,
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hand microphone I've got here,
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and that will activate the transmitter on the radio,
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and it will try and tune the load.
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Now, I'll just, out of interest sake,
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uh, I've got the radio switched to the SWR position,
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and if I click the transmitter,
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and I'll just give it a tiny, tiny wee,
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I'll just briefly speak into the microphone
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and see what sort of reading we're getting in SWR.
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Uh, so, where is the SWR scale?
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Is, ooh, I need to get down,
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because I can't see it from here.
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Oh yeah, so, okay, here we go.
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It looks like it's 2.5,
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uh, so the SWR is,
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it's setting about 2.5,
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2.5 to 1, is it?
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I think that's what you say.
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So, um, yeah, that's,
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that's too high.
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You want it barely to move, really, ideally.
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Um, so, what I'll do,
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I'll just push the AT.T,
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and then I'll push the button on the microphone,
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and you'll hear it grinding and crunching away as if.
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It won't be very long,
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because it doesn't take it terrible long to,
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to find the tune points.
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So, here we go.
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You're pushing AT.T now,
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P.T.T.
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And it says tuning finished TX ready,
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and then this display just goes back to the,
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to the clock or whatever it was set to.
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Now, if I push the P.T.T again,
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and give a brief whistle,
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or a brief noise,
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yes, 1.2,
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1.2 to 1, as opposed to 2.5.
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So, there you go.
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It's tuned the radio up.
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Um, uh, that's it.
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So, uh,
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but you couldn't wait for that noise.
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It was, uh,
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you were riveted to your seats,
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and apologies.
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I should have really included it.
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I knew that at the time,
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but as I say,
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I said previously that I was,
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I was short on time,
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and that's always the difficulty.
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I got a certain period of time
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to do my recordings,
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and then I do it.
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And then it comes to show notes,
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well, you know,
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you can, you can stop and start
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to show notes as you like,
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but when you're recording something,
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you really want to get,
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uh, down in a one hour sort of thing.
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So, where that,
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that's the way it goes.
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Phew, well, there you go.
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I thought this would take about two,
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three minutes,
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and we're now at,
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I'm now at nearly 11 minutes.
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I almost forgot,
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um,
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Michael also mentioned about,
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uh, not giving an example,
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about the, uh,
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operation of the noise blanket,
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on, uh, the radio.
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Um, the noise blanket,
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uh, is used to, um,
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strip out, uh,
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short, um,
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pulsed type interference,
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that, uh, you get on the radio.
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Um, there's,
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there's two noise blankets on the radio,
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uh, one,
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I think it's for,
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really, really,
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fast, short,
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pulses.
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And,
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my second one's for,
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a longer pulses,
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I think, from memory.
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The trouble with this is that, um,
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it is, uh,
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I need to hang around waiting for
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pulses like that to appear,
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so that I could use the noise blanket
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and find it.
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So, um,
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it's kind of a wee bit in practical.
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I, I, I,
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maybe I could,
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around the internet and find examples
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of a noise blanket.
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And I say it often,
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these things don't work terribly well.
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And,
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they don't work fantastically well
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on the 9,
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on the 940,
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but they work better
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than I've experienced on other radios,
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let's see.
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Um,
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sometimes it's really good,
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it works quite well,
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but as you,
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it might have an idling car outside
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and,
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and this back of the nation,
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uh,
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causes,
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sort of ticking noises on the radio
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and pushing the noise blanket in it
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and adjusting the,
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how,
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how aggressively it takes out, um,
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sort of, um,
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you can,
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remove it basically.
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And you're almost,
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don't notice the,
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the missing bits of audio
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that are,
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that are taken out.
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Um,
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so, yeah,
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it was lack,
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lack of time again.
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Well anyway,
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I hope you find that interesting.
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And until next time,
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I'll sign off,
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this is MrX,
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signing off.
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If you want to contact me,
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you can contact me
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at MrX,
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at HPR,
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at GoogleMail.com.
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That's MRX,
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80,
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HPR,
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the At Symbol,
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googlemail.com.
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So until next time,
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thank you,
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and goodbye.
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You've been listening to
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Hecker Public Radio
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at HeckerPublicRadio.org.
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We are a community podcast network
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that releases shows every weekday,
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Monday through Friday.
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Today's show,
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like all our shows,
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was contributed
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by an HPR listener
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like yourself.
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If you ever thought
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of recording a podcast,
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then click on our
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contributing,
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to find out
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how easy it really is.
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Hecker Public Radio
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was founded by the digital
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dog pound
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and the infonomicum
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computer club,
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and it's part
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of the binary revolution
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at bnreft.com.
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If you have comments
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on today's show,
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please email the host directly,
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leave a comment on the website
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or record a follow-up episode
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yourself,
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unless otherwise stay
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to.
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Today's show is released
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