Kenwood Ts-450 Manual
In article, atec77 wrote: >Is carrier normal, is it is then you have a mic circuit /gain problem >or alc problem? Yorklynyankee, you did not mention how low was the power. If it was in the neighborhood of 80 watts, I would not worry about it unless there were reports of distorted audio. It sounds like the carrier is normal, judging by the CW/FSK power.
Title: Kenwood - TS-450S & TS-690S User manual Author: John Subject: HF RTX Keywords: Kenwood - TS-450S & TS-690S User manual Created Date: 5/24/2003 7:37:34 PM. Kenwood - TS-450S/690S Service manual - IW2NMX - IW2NMX Home Page. View, read and download service manual for KENWOOD TS-450S, learn how to repair it, fix failures or solve other issues. Kenwood TS-450 User Manual.pdf - Jahnke Electronics.
I suggest you download the TS-450/690 service manual, and look for adjustments that involve ALC and/or balanced modulator. Romance Films Sly Cooper here. One place that should have the manual is:.
You must register in order to download, and there are limits on how often unless you donate. Fred K4DII Channel Jumper 20.05.13 14:18. Its probably tired from being used too much on 11 meters.
Maybe it is folding back because of a high SWR - you don't run CW and FSK in the same part of the band as phone. Are you checking it into a true 50 ohm dummy load or the antenna? Did you check your antenna since last winter - maybe it stretched from ice / wind blowing etc. Maybe your coax has issues. No way to know because my crystal ball is broke. There is always a certain segment of the population that doesn't understand SSB and always wants 100% performance out of everything and will strive to squeeze every last watt out of something, regardless of if it worked ok or not before they started messing with it. In CB talk that is called Peak n Tune.
You won't ever notice any difference in perceived signals strength between 80 watts and 100 watts on most phone conversations. I wouldn't worry about it. Are you fully modulating the signal when you are measuring it with your Bird meter? CQ CQ CQ K K K P P P D D D You will only see full signal strength when it is fully modulated. CW and FSK is 100% duty cycle - fully modulated all the time. Running the transmitter at full power for any length of time will damage it on FSK.
Its not designed to be used that way with more then about 30 or 40 watts. Does it have an auto tuner? Is it turned on or off? -- Channel Jumper you 21.05.13 12:56. In article, Channel Jumper is an Idiot, and obviously has never operated a TS-450. More than likely what you are seeing is the ALC foldback, lowering the Gain, in the TX Gain Stage, that drives the Final Amp Circuit.
Having both TS450's and TS 690's here, this is very common, to have the Radio do this when it comes from the Factory, or a Factory Trained Tech, after a Service Call. The Factory sets the ALC High, so that the radio will ALWAYS meet, the published IMD Spec. You can, by readjusting the ALC Feedback Circuit, setup the TX to output TX PEP Power and a reasonable Average Power as shown on a non-PEP Wattmeter, without compromising the IMD level of the resultant Transmissions, in any significant way.
Yorklynyankee 25.05.13 15:25. Thank all of you for your suggestions. Just for the record, I don't operate CB radio, I am a retired Research & Development electrical engineer from HP, and I have a masters degree in Electrical Engineering.
Now to answer some of the questions. As I mentioned in my first posting the radio is connected to a 50 dummy load. By low output power I mean 5~10 watts, I have tried two different microphones. I have another Kenwood TS-450 so I have a working radio to compare their outputs. When I whistle into the radio using USB/LSB on any bands at any frequency, the radio will only put out 5~10 watts. Whereas under identical conditions the working radio will put out 100 watts. There is absolutely NO DOUBT that this radio's USB/LSB is not working.
The same radio puts out 100+ watts on CW and FSK. I suspect something in the balanced modulator, but I am looking for someone who has encountered a problem like this before. This radio is known for having some common problems, like C104, so I was hoping that there was another frequently failed component that causes this problem. -- Yorklynyankee Channel Jumper 01.06. Nuova Elettronica Handbook For The Recently Deceased there. 13 10:36.
In article, Nate- I have the TS-690, which is a TS-450 with Six Meters. I also have other older Kenwood equipment.
They all suffer from a common problem: leaking electrolytic capacitors. In the case of the TS-690, the first problem was when an electrolytic capacitor in the audio circuit leaked, and the leaked chemical corroded one of the circuit paths. I was lucky to find it, and was able to repair it by replacing the capacitor and running a wire jumper from one end of the path to the other.
In other equipment such as the TS-50, there have been numerous problems with capacitors. Some I have been able to fix, but they keep cropping up.