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Low TX PWR/ATU won`t tune. No SWR and ALC metwr reading?

Ts 2000x ATU will not tune - beeps high SWR once AT switch pressed even on dummy load. Antenna SWR checked ok. Tx power seems lower than normal with no SWR and ALC meter deflection. SWR meter reading normal if ATU switched off? RX ok with or without ATU.

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You've replaced the pre driver, the drivers and finals. Set bias and still low output. The pre driver is the same transistor used as the tx exciter transistor on other pcb chassis on bottom of radio. Follow the gray coaxial wire from the pre driver on the RF circuit board back to the tx/rx i.f. Circuit board. The gray coax cable plugs right next to the tx exciter transistor on this pcb. Again it's on a different pcb all together and on the bottom of the radio and also. Replace it! And check for open bias or emitter to ground chip resistor next to it. You will get your drive back. Very few rigs have I seen the actual Finals blown in the mosfet or the bipolar version. Just the driver stage with a week pre driver and the SMT "pre" pre driver on the same RF pcb. And the tx exciter on the other pcb.

Posted on Jan 13, 2015

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Posted on Jan 02, 2017

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How do you calibrate the SWR meter in a 706 mkiig? The service manual shows how but does not expand on what dummy loads to use.


A standing wave ratio meter is rarely required to be accurate and isn't usually used with a dummy load.

Mostly if the correct antenna is used the SWR meter is placed in series with it so the antenna can be adjusted or tuned to produce the lowest reading, which is the smallest amount of energy being reflected back into the transmitter or in other words the combination of transmitter and antenna are working as efficiently as it can be.

Clearly the readings are merely relative but a degree of accuracy is needed when an inefficient or mismatched antenna is used and the SWR cannot be lowered to a safe limit. When the SWR is too high the transmitter can be damaged and so it is a good idea to know roughly the reading where the transmitter stops being safe.

A dummy load would typically be used for testing and setting up a transmitter without radiating a signal. Nonsense and spurious signals are considered antisocial and even ******* so tweaking the power, adjusting the modulation and checking for stray harmonics would be carried out using a dummy load.

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Kenwood ts-430s


where are you tx'ing, if its out of band it wont or maybe its got a bad final, is there any power, have you checked it on a dummy load
bad swr, out of band etc

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ATU failure


I would recommend you check on
mods dk Modifications for radioamateur

There is a lot of good information there, and people are very helpful.

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Kenwood ts-2000 internal antenna tuner fail to tune


it's not failing to tune, it shutting off as tuned. 1.25:1 is below it's threshold to tune

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Furuno at 1500 atu


This works for the Furuno 1501-Make sure your connections are the same:#1 provide 15V & gnd to tuner(12V works) #2 connect coax between tuner & Xmtr / antenna to tuner #3 set radio to transmit CW carrier @ no more than 10W #4 momentarily short tune to gnd, this will initiate tune process. Watch SWR meter/ listen for tuner to complete, stop 10W carrier & return radio to normal status. I use mine remotely mounted with a 3 wire control cord & a box with a push button momentary switch back at the radio. Connections are 12V & gnd from the power supply to tuner, tune back to control box where the button shorts it to ground to tune.

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Kenwood TS 2000X: Low HF TX power output on HF bands ONLY.


Hello, this problem is solved and how?
I have the same problem on HF and VHF 30Watt max output

1.8 MHz-20M 0-5Watt
10M 25 Watt
6M-30Watt

2M-25Watt

70cm 42Watt is ok
23cm 10Watt is ok

thanks

Tuxon7@gmail.com

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1 Answer

Very low TX output power on ALL HF BANDS ONLY. Other bands OK!


look for a broken or cracked board near the driver s & finals, try pushing around on the board with your plastic screwdriver, you may luck into it.

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Kenwood ts-450s - cannot tune and no ptt


This is usually due to a stuck or shorted ptt line. I have repaired a couple of these and it was the same component each time. The packet TX transistor Q65 shorted causing the radio to power up in TX inhibit mode. Transistor Q65 is located on the underside of the IF board under the ACC 2 connector. This switching transistor is used only for tx (pin 9 of acc 2) and no other circuits depend on it. It can be removed completely if you don't mind not having ptt on acc 2.
This seems to be a common problem lately, I hope this helps you.

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3 Answers

Antenna


Checking and setting the swr can only be accomplished with an inline swr meter, not with the radios swr cal switch and the radios meter. Once you have set the swr of the antenna, you cal the radios meter to reflect the actual swr reading and use it like a dummy light on a car, just as an indicator of high swrs. To set your swr:

You must have an inline swr meter, which can be purchased online or from a truck stop. The ones at truck stops are cheap ones, but will do the trick for the most part.

You connect your antenna 18ft coax to the antenna plug of the swr meter, and a jumper coax (any length) to the transmitter plug of the swr meter and then to the radio.

Close all doors and make sure no one is messing around with the vehicle or antenna. You must be set up as you would normally be transmitting.

Now set your cb radio to channel 40 and your swr meter to fwd. Key up your microphone1.gif and at the same time turn the set knob on the swr meter until the needle is at the line that reads set. Unkey your mic and set the the swr meter to ref. Key up again and note what your reading is. Now leave the swr meter in ref and turn the cb to channel 1. Key up and take your reading. If the reading on ch 1 is higher than ch 40 you must raise the stinger on your antenna. If ch 1 is lower than 40, you lower your stinger. You are trying to get lower than a reading of 3 and as close to 1.5 as possible. If you lower your stinger as far into the antenna as it will go and you need it shorter, you cut the bottom of your stinger no more than 1/2" at a time, and recheck your swr reading after each cut.

Once you have gotten the best reading you can, connect your antenna directly back to the radio.

The setting of your swrs is to make your antenna as efficient as possible, by trying to get it as close as you can to a 50ohm impedance. THE ONLY PART OF YOUR SYSTEM THAT CAN CHANGE YOUR SWR IS YOUR ANTENNA, not your coax and not your radio. Your radio and coax can give you false readings, but only the antenna can actually change the swr.

On the swr meter, the fwd/ref switch stands for forward (power that is being transmitted out) and reflected (power that is reflected back into the radio.

Just for information sake, the swr cal switch on your radio is used to set the meter to reflect the swr that your antenna is set at. The meter on your radio is like a dummy light on your car. ONCE AGAIN, YOU CAN NOT SET YOUR SWR ON YOUR RADIO, only the antenna.

Dean
Rollin CBs
Mt. Vernon, TX

Aug 23, 2007 | Cobra 29 LTD CB Radio

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