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MC-47 mic pics

 

Good Day,

Does anyone have any pictures of the inside of an MC-47 mic? The factory?original mic for the TS-50.

Thank you.

Bob W4JFA
Re: TS-450S BCB sensitivity

 

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This is not a comprehensive response to your query but I hope it suffices for now.
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The channel number is really just a frequency that is the KW standard for alignment. The Menu number is something else.
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To my understanding, there are two procedures that create a digital curve that is stored in ROM. One of these is the S Meter curve and the other is the ALC curve.
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If you perform RX alignment of any consequence, you must perform the S-Meter curve procedure, and the same can be said for TX adjustments and the ALC curve. Neither of these procedures are particularly intuitive, so I would suggest going through them a few times for familiarity.
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Please note that these "curves" require that you perform the #17 EEPROM write as described on page 43 of the SM when you finish the procedure.
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I hope this helps....73...Jordan VE6ZT

----- Original Message -----
Sent: Friday, April 11, 2025 1:57 PM
Subject: Re: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

Jordan,
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As much as you can share on your findings and solutions would be much appreciated.? I understand the idea but haven't understood how to use the adjustment mode relative to the Adjustment tables.
Mike
Re: TS-450S BCB sensitivity

 

Jordan,
?
As much as you can share on your findings and solutions would be much appreciated.? I understand the idea but haven't understood how to use the adjustment mode relative to the Adjustment tables.
Mike
Re: TS-450S BCB sensitivity

 

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Hi group...
?
I'm not finished working on my 450S, but i've got to say that the 450 and 850 service manuals contain some very poorly written translations from Japanese, and also some errors in the alignment instructions that take some time to decipher and adapt to the correct alignment methods...
?
More later....73...Jordan VE6ZT

----- Original Message -----
Sent: Sunday, March 23, 2025 2:49 PM
Subject: Re: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

Group...
?
If there is someone with a TS-450S who can check the change in sensitivity crossing the 499 to 501khz and 1704.00 to 1706.00khz points (where the BCB attenuator is switched in and out) I would really appreciate it...Even better if you have a signal generator and can tell me the S-Meter changes at those frequencies...
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I'm trying to limit the number of times I have to pull the RF board because of the stresses and strains?on the board, connectors and thru-holes...
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Thanks...Jordan VE6ZT
----- Original Message -----
Sent: Saturday, March 22, 2025 3:35 PM
Subject: Re: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

I've made a few "discoveries" about the root of the BCB?problems I have?been having. Should I post my findings here or on the 850S page...?
?
73...Jordan VE6ZT
----- Original Message -----
Sent: Friday, March 14, 2025 4:37 PM
Subject: Re: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

Well, I replaced the diodes and it didn't make any difference...Time to make some dinner...73...Jordan...
----- Original Message -----
Sent: Friday, March 14, 2025 2:27 PM
Subject: Re: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

Ooops...it should read "...which formed part of the BCB attenuator..."
?
73...Jordan...
----- Original Message -----
Sent: Friday, March 14, 2025 2:23 PM
Subject: [Kenwood-Amateur-Radio] TS-450S BCB sensitivity

Hi group..
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I have a 450S which has served me very well for ~30 years now. Long ago, I jumpered the resistors which formed part of the BCB, effectively removing the attenuator. It was fine for years like that, but a few months back I noticed a drop in BCB sensitivity.
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All other bands are fine...
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I checked everything I could, replaced the jumpers and verified the ckt, to no avail.
I checked the control line for that?band at the 74LS245 and found what I thought was the problem, so this morning I replaced that IC.
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It didn't solve the problem. The only other thing I can think of is that one of the 2 RLS135 diodes for that band might be flaky so I checked them as diodes and they test fine.
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Is it possible that these diodes might operate fine for DC but not for RF...?
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I think I'll replace those two diodes and check again, but this has me a little stumped...
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73...Jordan VE6ZT
TS-50 front buttons

 

Hi all, I have a TS-50 that has all the foam that holds the front buttons in place deteriorated beyond use. I'll figure out something here but I was curious if anyone
has already been through this and has any hints.

Thanks in advance.

Bob W4JFA
Re: SM-220 two tone adjustment

 

OK scrub that. I ve just found the pot adjustment screws underneath the bottom cover ... ?.
?
--
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?
?
--
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).
?
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!
?
--
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?
?
--
Mike G8GYW
?
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?
?
--
Mike G8GYW
Re: TS-870S no TX

 

Hello Sam
?
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.
?
--
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
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