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Get and get this kenwood ts 790 service manual sooner is that this is the compilation in soft file form. You can right of entry the books wherever you desire even you are in the bus, office, home, and other places. But, you may not habit to imitate or bring the record print wherever you go. So, you won't have heavier bag to carry. I'm a new Ham, and running a TS-790A on VHF/UHF alongside a TS-850SAT for 160-10M. I LOVE these radios and don't have to navigate all the submenus of the newer rigs. They both seem to run fine,and I get great signal reports on the 790-one question though. The sub band VFO display is dimmer than the main display (about 30% dimmer). Biohazard gamecube iso file online. GENERAL: Type: Amateur VHF/UHF transceiver: Frequency range: 144-148 / 430-450 MHz (23 cm/10W option) Tuning steps: 20 / 100 Hz 1 / 5 / 10 / 25 KHz: Mode. Get and get this kenwood ts 790 service manual sooner is that this is the compilation in soft file form. You can right of entry the books wherever you desire even you are in the bus, office, home, and other places. But, you may not habit to imitate or bring the record print wherever you go. So, you won't have heavier bag to carry.
I recently got a second hand TS-790 with the 1.2 GHz unit installed and after a good cleaning and service I've done, I decided to search the options I have to get the IF from the radio to feed my SDRplay wideband receiver.There is no doubt that software defined radios are the future.. I thought it would be very nice to have a panoramic view of the bands while using the same antenna.
![Kenwood Ts 790 Service Manual Kenwood Ts 790 Service Manual](https://jahnkeelectronics.com/wp-content/uploads/2014/11/DSC02943.jpg)
After search I found the TS-790 service manual and I started to study it. This rig has 2 independent receivers (main and sub) and as a result has also 2 IF's. The IF for the main receiver is 10,695 MHz and the IF for the sub receiver is 10,595 MHz.
I decided to go for the sub band IF because I didn't wanted to mess with the transmit circuits used in the main band. Looking at the block diagram it seems that the signals from all the bands (VHF/UHF/SHF) are going into the XF1 filter and then to Q5 fet amplifier. So the best place to tap for the IF would be the drain of Q5 fet. Respectively, if someone wants to get the IF from the main band should look for the drain of Q56 fet.
Kenwood TS-790 IF Block diagram |
![Kenwood Kenwood](https://jahnkeelectronics.com/wp-content/uploads/2019/10/DSC00159-scaled.jpg)
KENWOOD TS-790 Schematic with SUB IF TAP POINT |
Of course, you can't just solder a simple wire and get the IF. You need to add a suitable buffer amplifier to isolate you from the circuit and that way you don't have losses at your sub receiver.You have to use a good quality RF cable and place the buffer amplifier as close as you can to the tap point.
You will also need to get somewhere the 13,8 volts to give power to the buffer amp. You can build your own buffer or you can buy one, as I did. I chose to buy from G4HUP.
There is a lot of work needed to actually reach the IF tap point. If you feel that you cannot do it, then DON'T TRY IT. You may damage your expensive radio. Ask for help from someone that is more qualified to do this.
I take no responsibility for any damage that this modification may do to your radio. Proceed at your own risk !!!
Remove the bottom cover of your radio. You will see the IF board. Then you have to remove the IF board. To do that you must unscrew first all the screws keeping the board in place and also unplug all the cables. There are many cables !!! It's highly recommended to take a high resolution photo of the board with all the cables attached in case you forget their position.
Then locate the IF tap point. In practice I soldered the cable directly to the L3. I find it's a good place and not very risky to burn the FET or other components. Don't forget the shield of the coax, use as ground the case of L2. Use a good quality RF cable. Secure the cable to the board with some tape. Check my photos below. (G4HUP does not provide the input RF cable, he provides only the output IF cable with a male or female SMA connector). I got the male SMA option to connect direct to the SDRPlay receiver input.
IF TAP POINT DIRECTLY TO L3, SHIELD TO L2 |
You will also need power for your buffer board. A good and safe place is the pin 7 of the ACC 4 connector. It's at the back side of the board, a little far, but I didn't have any RF problems. This pin provides 13,8 V from the main power switch of the radio. If you search carefully you may find a closer place to get the power. I was in a hurry to test this mod, so I didn't searched more :-)
13.8 V from power supply |
Buffer board in place |
General view of the IF board with buffer installed |
If you want to see more bandwidth at your waterfall, you can try a different tap point at L1. This will give you at least 1 MHz (and much more), which in some cases might be more usefull.
If you go up to the top of the page you will see at the IF schematic diagram a GREENpoint. This is L1. Click on the picture below to see in detail my second test with the tap point at L1.
Don't try to get the IF without a buffer amplifier - isolator, or you will loose RX sensitivity and maybe damage your radio. This is NOT recommended and NOT guaranteed.
IF tap point before the filter (at L1) for maximum bandwidth |
My favorite SDR software is HDSDR. It's free and easy to use. Configuration is very easy. Just set the IF frequency to 10.595 MHz and start listening !!!
HDSDR IF CONFIGURATION |
So many options and a totally new way to enjoy my radio and hobby..
73, Fanis
SV1BGMHello!
Well, I needed to get back to my recently repaired Kenwood TS-790 as it developed a new problem.. first ATV label (yes, there is an ATV label !) blinked from time to time, with no apparent reason and, sometimes, it kept lit for a long period. I checked schematics and got lost when trying to find the origin of the signal..
But eventually it got worse: yesterday, while talking in a local QSO in 2m FM with the 790, I found a very curious thing. My 790 was SLOW to react to key presses, frequency change and even PTT!. Yes, there was a variable delay, from zero to some seconds, for the unit to execute what it was asked to do.. Having worked for years in digital electronics, I thought the CPU was receiving some kind of interruption which made it work slow and even lose some commands or inputs to it. Immediately I thought of a backup battery leak damaging the circuit..
Here you have a low quality video of what happened. Sometimes dial is not updated but frequency changes. Also, F key is erratic:
So I got the 790 back to the workbench and, yes, there it was!. Battery, which measured a perfect 3.32V, had leaked and damaged some PCB traces below it. I don't know how I missed this when I fixed the unit!
Kenwood Ts 890 Service Manual
This is what was below the battery..
I got the bad battery out, cleaned the acid residue and added a battery socket and a 2032 3V battery which is smaller capacity than the original one but lots easier to locate and, with the socket, a breeze to replace next time. I used Renata
Kenwood 790 Vhf Radio
swiss made battery and holder as they are IMHO one of the best batteries available.Note that the battery holder was not a perfect fit so I needed to add some wire to connect one of the poles to the PCB. But, all in all, it is lots better than the original soldered battery.
I tested the rig and it worked almost flawlessly. Yes, there is now a different fault which I need to further investigate.. Now ATV icon does not light and rig reacts fastly to keypresses, PTT and such. But now ON AIR LED is sometimes behaving strangely: it sometimes does not light and sometimes keeps on even when PTT is not active (but rigs go to TX and
Kenwood Ts-790 Service Manual
RX as it should). So I need to check carefully how ON AIR LED is activated and check the unit to locate the fault. I will do it when I install theKenwood Ts 590s Manual
UT-10 1.2GHz module I recently bought.. so keep tuned for a further update :-)!Regards,