Kenwood ts430s

[The Mad Scientist]

Thanks Tony, i was thinking the same myself. I figue i would like them to give this classic rig a clean bill of health. These rigs have a long history of quality operation, and i hope that this holds true. I will be using it in the mobile with a screwdriver antenna. Would you guys have a recommendation on this as well?


It will be somewhat of a pain to retune for every band but it would probably be better than having multible antennae on the vehicle and hence less chance for reflect issues.

 

[BJ radionut]

Look up KJ7U Larry....antenna wise...I like mine KW160-6

Mobile stick with stock hand Mic or a Heil HM-10(mini version of the GM-5) only single element not dual like the big brother GM-5
All the Best
BJ

 

[The Mad Scientist]

Sounds good. i will have to look into them. Thank you.

 

[The Mad Scientist]

Hi Gentelman,

I seem to have fixed the distortion problem. I checked the bias and found it was 1.29 amps. Readjusted it via the service manual to around 400 ma. and retested and got good reports.

I have a question tho,

It states that vr1 and vr2 be adjusted to minimum. The lowest I could set them to was 343 ma., I am not sure if their is a specific minimum? I have the total bias set to a little over 400 ma.

Also, still looking at the Fm problem. rechecked the jumpers and the are in their propper orientations. It has RX and TX but no audio. I wonder if the problem could be in the switching, and or a problem with a component on the FM board itself?

Thanks in advance.

 

[BJ radionut]

MS: Did you try adjusting the deviation level? Special pot on the FM board...controls bandwith and audio level while in FM Mode...
You have most likely but thought I would ask
GL
All the Best
Gary

 

[The Mad Scientist]

Thanks Bj, I was thinking the same thing and i haven't tried it yet, I will go back over the service manual to see which adjustment it is.

Good call. And thanks again.

 

[The Mad Scientist]

I think i may have gotten that wrong. If the lowest ma. reading i get is 343ma. then wiith a 200ma. increase for the driver transistors, and a 200ma. increase for the finals should bring the total to around 743ma. or so.


Would anyone agree with this?

I am also wondering about the 2sc2290 transistor final bias. I know from working with amplifiers of the same complement the bias should be around 100ma. for the pair of them. So I am wondering where the extra 100ma. is comming in at?

Perhaps this is due the the rig not being very efficient?

I am currently running the rig with the total bias set around 750. I am getting really good reports on it. Maybe I should leave well enough alone and move on to the FM board. I don't really know.

 

[The Mad Scientist]

The distortion problem has been fixed. The bias was to low, plus the stock mic had a problem as well.

Now I need to find a FM board...........

I tried the deviation adjustment and it had no effect.