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  1. Kenwood-Amateur-Radio
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Date
Re: SM-220 two tone adjustment

 

OK scrub that. I ve just found the pot adjustment screws underneath the bottom cover ... ?.
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Mike G8GYW
SM-220 two tone adjustment

 

I'm checking the performance of my newly acquired SM-220 and note that the levels of the two tone generator measured at TP1 and TP2 are 5.8V p-p which is nearly double the specified 3V.
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So I decided to adjust them but found this to be impossible because VR108 is inaccessible (under the CRT) and I can't see VR107 anywhere. My PCB doesn't match the drawing in the service manual.
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Any ideas please?
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Mike G8GYW
Re: Kenwood SM-230 Station Monitor

 

Thanks Tom.
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Mike G8GYW
Re: Kenwood SM-230 Station Monitor

 

I leave my 220 in line all the time, and turn it on for the first few transmissions from each transmitter so I can see what my signal looks like. (I'm one of those idiots who constantly tinkers with their audio train. Sometimes unexpected things happen...) ? ?I leave it off otherwise to save the CRT. ?Insertion loss is negligible as measured by VNA or watt meter (located just before the antenna).
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73,
Tom ai4th
Re: TS-870S rear panel audio input

 

I believe the speech processor is only available for the microphone main connector circuit.
Re: TS-870S rear panel audio input

 

Thanks Sam that link was very informative and it has persuaded me not to go down that route. I don't need the complication of an audio rack!
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Mike G8GYW
Re: Kenwood SM-230 Station Monitor

 

I couldn't find an SM-230 locally but I did get an immaculate SM-220. Not the same colour as my radio but it will do for now.
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Do you guys leave the monitor in the antenna lead all the time or just connect it up when needed? Is the VSWR / insertion loss OK?
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Mike G8GYW
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Re: TS-870S rear panel audio input

 

I think the main difference between the two input methods is that the mic input has a differential amplifier to cancel common-mode noise (i.e. noise imposed on both the signal and ground wires from the microphone) where that isn't the case with the ACC connector input.?
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Here is more discussion on the same site provided by Trevor
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Sam, W7STF
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Re: TS-870S rear panel audio input

 

Thanks Trevor. I get the impression that the guys doing this are running external audio processing whereas I would just want to use the mic (at an appropriate level).
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Mike G8GYW
Re: TS-870S rear panel audio input

 

Hi Mike
You might like to look at this;
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I have to say I’ve not yet tried using the ACC in place of the mic…
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73
trevor G4CLE?
TS-870S rear panel audio input

 

Now that I've fixed the problem with my ACC2 socket I've been reading about the supposed benefits of using it for audio in instead of the Mic socket.
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Apart from making the front panel tidier (no mic cable) is it worth doing? Is the speech quality improved without any external processing?
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Mike G8GYW
Re: TS-870S no TX

 

Hello Sam
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I made sure that the indent was correctly aligned, the problem was the excessive amount of force required to push the plug home. I've thrown that cable away now to avoid problems in the future.
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Incidentally, on the TS-870 the ACC2 socket indent is at the bottom because the PCB is upside down in the chassis.
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Mike G8GYW
Re: TS-870S no TX

 

Mike, I don't know that you indicated the radio was mis-behaving when no cable was installed in the socket... As others indicated, the 13-pin DIN male should mate with the female socket EASILY. You have to make sure that the indent in the shield is located towards the ceiling, 12 o'clock...
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And not all 13-pin DIN cables are the same.?
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Even if the cable had nothing plugged into the other end, likely the cable wasn't straight-through, and several conductors/pins were at the same potential as GND (the shield). This could be verified with an ohm meter. Check the resistance between each pin of the suspect cable and the shield. If any of the pin to shield resistances are low, you've found the culprit.
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Glad you resolved your problem.
Sam W7STF
Re: TS-870S no TX

 

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No problem Mike....Glad you got it sorted...73...Jordan...

----- Original Message -----
Sent: Thursday, March 27, 2025 6:34 AM
Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX

Hi Jordan, I bought an MFJ accessory cable with a 13 pin DIN plug on one end and it goes into the ACC2 socket easily. It looks identical to the other plug that doesn't fit so I don't know where the problem was. I can wiggle the plug in the socket and it doesn't drop out of TX so I'm hoping it will be OK now.
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Thanks for listening.
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Mike G8GYW
Re: TS-870S no TX

 

Hi Jordan, I bought an MFJ accessory cable with a 13 pin DIN plug on one end and it goes into the ACC2 socket easily. It looks identical to the other plug that doesn't fit so I don't know where the problem was. I can wiggle the plug in the socket and it doesn't drop out of TX so I'm hoping it will be OK now.
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Thanks for listening.
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Mike G8GYW
Re: Kenwood SM-230 Station Monitor

 

I am located in Japan, and I have SM-230 and would part with it if somebody want it.? Tom
Re: Kenwood SM-230 Station Monitor

 

On Tue, Mar 25, 2025 at 04:51 PM, John Geiger AF5CC wrote:
Here is one if you can get them to ship it to the UK:
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73 John AF5CC
Thanks John. That's a low price, the last one I saw at a UK dealer was ?699.
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My PS-31 PSU came from the US, it was in immaculate condition but the courier dropped it and bent the rear panel.
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Mike G8GYW
Re: Kenwood SM-230 Station Monitor

 

Here is one if you can get them to ship it to the UK:
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73 John AF5CC
Re: Kenwood SM-230 Station Monitor

 

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The AIP function bypasses the Rx RF amplifier and feeds the Rx signal directly to the mixer, resulting in less gain on Rx...That's why you see less signal on the SM-230 when the AIP is on...
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73...Jordan VE6ZT

----- Original Message -----
Sent: Monday, March 24, 2025 7:44 AM
Subject: Re: [Kenwood-Amateur-Radio] Kenwood SM-230 Station Monitor

Right. It may not bypass it, as I do see faint activity on the scope, but the signal emitted from the IF out is definitely weaker.
73,
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David, WU3J
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