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-   -   TS-440 breakdown assistance request (https://www.vintage-radio.net/forum/showthread.php?t=166956)

jeanyves63 19th May 2020 8:23 pm

TS-440 breakdown assistance request
 
Iaorana. My name is Jeanyves and I live on the island of TAHITI in French Polynesia. Thank you for welcoming me in this forum.
I have a Kenwood TS-440S radio, when I am in AM mode my program is jerking as if I am in USB, Has anyone in the group been faced with this problem? thank you for your help Mauruuru

Google a traduit. Veuillez utiliser l'anglais dans ce forum, merci.

Julesomega 20th May 2020 2:50 pm

Re: TS-440 breakdown assistance request
 
Hello Jeanyves. I was waiting for someone else to reply because I do not know much about what is inside mt TS-440, I don't often use it and and it has never gone wrong!

I don't understand what your problems is. Is the problem on receive or transmit?

I remember from the Yahoo group that the most common problem is the blue compound Kenwood used on early models to lock the VCO tuning cores. All the posts and files from the group are now on Groups.io. Join the group and everyone there will understand your problem, and will tell you the solution!

PostScript - I see you have already joined the group and are getting advice

Jon_G4MDC 20th May 2020 5:09 pm

Re: TS-440 breakdown assistance request
 
I was going to comment yesterday. If I understand it is too much sideband and not enough carrier power.

The correct way to adjust is to set the AM carrier control to give about 1/4 the rated SSB peak output - without modulation applied. e.g. (~25W for a 100W PEP O/P rig)
Then increase modulation using the MIC gain until just before distortion sets in (needs a second RX). If you have a scope until you have good looking mod depth
Peak and Trough.

Depending on how the power metering works it could respond to AM in all sorts of ways. It could "kick up" with AM modulation and nothing is actually wrong.


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