Kenwood Transceivers by Date of Manufacture
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Kenwood Ts 850 Serial Numbers
The Kenwood TS 940 is a dynamic radio transceiver for the serious amateur radio operator. It has many features, including the following: Interference reduction: Enjoy the combination of dynamic interference reduction circuits and a high range receiver for quality transmitter design to get your signal through. Coverage: TS 940 covers 160 to 10. Recently added another boatanchor to my collection, a Kenwood TS-940s. It's working great! Unfortunally there were bad propagations during the movie-shoot. million serial number on a TS-940 means that it was made in 1987 becuase they weren't made after 91 or so. Now the dillemma. The TS-940 has a serial range of 10 million (1989) during which some very significant changes were made to the design of the radiosuch as soldering in the eprom to eliminate erratic problems. You are buying a Kenwood TS-940SAT Transceiver. This radio is in excellent working condition and in very good physical condition – serial 7110061 – Please see the details in the pictures. Free Shipping applies to contiguous States – please email for quotes elsewhere! Unit transmits at a full 100 watts. Kenwood serial numbers come in 2 formats. The original format used from the initial production up until approx. August 2008 is as follows: All numeric - First digit is Year code, add 1998 to get year. If first digit is 0 add 10 to 1998. Next 2 digits are month code starting with April (beginning of Japanese tax year) as 01.
TS-940 Questions
Kenwood Ts 940s Review
#276 I have a high serial number (12 mil) TS-940 that I just acquired and I have two questions ..... 1. The tuning rate is 3 KHz per revolution, not the 10 KHz that the manual states, and it doesn't change no matter how fast I spin the dial.... 2. Only every other band switch push button works....3.5 MHz, 10 MHz, 18 MHz, 24.5 MHz, and 29.0 MHz. I have reset the microprocessor, but no change.... Any ideas? Thanks, and 73.... Roger, WB9BXT. |
#277 The fix for strange problems like these seems to be cured sometimes by dropping the front panel (it hinges on a couple of screws), reseating the various connectors, and raising it again. You might try that before bringing out the scope and soldering iton. toggle quoted messageShow quoted textBob K6DDX On Friday, April 17, 2020, 11:19:31 AM PDT, Roger Hoffman <sooline@...> wrote: I have a high serial number (12 mil) TS-940 that I just acquired and I have two questions ..... 1. The tuning rate is 3 KHz per revolution, not the 10 KHz that the manual states, and it doesn't change no matter how fast I spin the dial.... 2. Only every other band switch push button works....3.5 MHz, 10 MHz, 18 MHz, 24.5 MHz, and 29.0 MHz. I have reset the microprocessor, but no change.... Any ideas? Thanks, and 73.... Roger, WB9BXT. |
#278 Bob: toggle quoted messageShow quoted textThanks for the tip....I'll give that a try as soon as I 'unwire' the radio from my operating desk. Roger, WB9BXT On Friday, April 17, 2020, 02:47:04 PM EDT, Bob Albert via groups.io <bob91343=yahoo.com@groups.io> wrote: The fix for strange problems like these seems to be cured sometimes by dropping the front panel (it hinges on a couple of screws), reseating the various connectors, and raising it again. You might try that before bringing out the scope and soldering iton. Bob K6DDX On Friday, April 17, 2020, 11:19:31 AM PDT, Roger Hoffman <sooline@...> wrote: I have a high serial number (12 mil) TS-940 that I just acquired and I have two questions ..... 1. The tuning rate is 3 KHz per revolution, not the 10 KHz that the manual states, and it doesn't change no matter how fast I spin the dial.... 2. Only every other band switch push button works....3.5 MHz, 10 MHz, 18 MHz, 24.5 MHz, and 29.0 MHz. I have reset the microprocessor, but no change.... Any ideas? Thanks, and 73.... Roger, WB9BXT. |
#279 Roger you don't have to unwire the radio. Just slide it forward on the desk then prop it up with a wood block high enough to allow the panel to swing down. This, after you remove the covers. Don't forget the middle screw on the bottom cover; it allows the cover to augment the heat sink for a voltage regulator. toggle quoted messageShow quoted textIf your cables are short you will indeed have to disconnect them. Bob On Friday, April 17, 2020, 04:14:07 PM PDT, Roger Hoffman <sooline@...> wrote: Bob: Thanks for the tip....I'll give that a try as soon as I 'unwire' the radio from my operating desk. Roger, WB9BXT On Friday, April 17, 2020, 02:47:04 PM EDT, Bob Albert via groups.io <bob91343=yahoo.com@groups.io> wrote: The fix for strange problems like these seems to be cured sometimes by dropping the front panel (it hinges on a couple of screws), reseating the various connectors, and raising it again. You might try that before bringing out the scope and soldering iton. Bob K6DDX On Friday, April 17, 2020, 11:19:31 AM PDT, Roger Hoffman <sooline@...> wrote: I have a high serial number (12 mil) TS-940 that I just acquired and I have two questions ..... 1. The tuning rate is 3 KHz per revolution, not the 10 KHz that the manual states, and it doesn't change no matter how fast I spin the dial.... 2. Only every other band switch push button works....3.5 MHz, 10 MHz, 18 MHz, 24.5 MHz, and 29.0 MHz. I have reset the microprocessor, but no change.... Any ideas? Thanks, and 73.... Roger, WB9BXT. |
#280 hHi Roger, I had a similar problem, can't remember the exact details, but the band switching is done via a 4 bit binary coded digit which drives 1 of 10 decoder chips to raise and lower the respective band switching diodes. The digit is sent over 4 parallel wires and the least significant bit (the edge wire in one of the ribbon cables) was not making proper contact - hence only even numbers were transmitted. As Bob suggested, the fault cleared as soon as you hinged the front down, but returned when you raised it back up again - it took some finding, but it sounds very similar - happy tweaking! ALan G3UQW |
#281 Roger, I've serviced a number of TS-940S and here is the procedure I've used for accessing the front panel. It contains some details that will, hopefully, prevent you from accidentally doing any damage. *Do not trust the extendable feet, collapse them before proceeding. *Place at least a 1' x 2' board under the bottom feet to raise the front of the rig off the desk. Remove the top cover. Remove all screws from the bottom cover but do not remove it from the radio. Slide the radio forward in the bottom cover until the front panel clears the front edge of the bottom cover. There needs to be enough room for the front panel to pivot and lay flat on the table. Place a folded cotton towel under the front panel to protect the face while you are working on it. On both sides of the front panel remove the two (2) flat head screws in the sheet metal plate holding the front panel to the chassis. Loosen, but do not remove the round head screws. *T**he front panel MUST pivot from the rear round headed screws and NOT the countersunk screws that secure the cast front panel to the sheet metal ears.* *Look carefully at the outer edge of Switch Unit I (SSB slope tuning & CW VBT) to see that it will clear the chassis as the front panel is pivoted down. It may get caught on the chassis and be seriously damaged. Also, be sure to look to be sure you don’t pinch/pull any wires. *Pivot the front panel forward and down so that it rests on the towel. Good luck with your repair and please keep the group posted on your progress. Ken WA2LBI (email thread history removed by moderator) |
#282 OK, thanks to the folks that responded, I have fixed my Band Switch issue.....I found a partially inserted connector on the associated board. I pulled it and replugged it and all is well. Makes changing bands a whole lot easier!!!!!! Thanks all, 73, and stay healthy! Roger, WB9BXT (email thread history removed by moderator) |
#283 Check to see if you have the TS-940 Giehl chip installed. It allowed 4 different tuning steps. https://www.wb8bfs.com/kenwoodchip.html Mike KD9CK |
#284 |
#285 Have you physically looked to confirm the Geihl Eprom is installed? It is not stock. -- Clif Holland KA5IPF www.avvid.com |
#286 Cliff: toggle quoted messageShow quoted textI'm not very familiar with that chip...where would it be located? Thanks, and 73.... Roger, WB9BXT On Thursday, April 23, 2020, 09:42:44 AM EDT, Clif Holland <clif@...> wrote: Have you physically looked to confirm the Geihl Eprom is installed? It is not stock. -- Clif Holland KA5IPF www.avvid.com |
#287 it's on the digital board that i /think/ also has the piexx/if10 toggle quoted messageShow quoted textplugged into it.. -a On Thu, 23 Apr 2020 at 08:58, Roger Hoffman <sooline@...> wrote:
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#288 Found this with a google search in about a minute.. toggle quoted messageShow quoted textInstallation of Giehl chip: The Giehl chip replaces the IC2 chip in the Digital A Unit. Some TS-940 IC2 chips are soldered and some are in sockets. Chips that are soldered without a socket require extra care in removing the original and installing the Giehl chip. ----- Original Message ----- From: 'Adrian Chadd' <adrian.chadd@...> To: 'kw-ts940s' <kw-ts940s@groups.io> Sent: Thursday, April 23, 2020 5:40:37 PM Subject: Re: [kw-ts940s] TS-940 Questions it's on the digital board that i /think/ also has the piexx/if10 plugged into it.. -a On Thu, 23 Apr 2020 at 08:58, Roger Hoffman <sooline@...> wrote:
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#291 Hi Roger, toggle quoted messageShow quoted textyou can easily check if the Ghiel Chip is installed in your TS940: If you can temporarily change the frequency of a memory channel in MEMO mode, then you have the Ghiel Chip installed.With the Ghiel Chip also the main Vfo knob tuning rate is controlled by the MEMORY BANK switch located under the sliding top cover of the radio. 73 de Martin, IW3AUT Il giovedì 23 aprile 2020, 17:58:55 CEST, Roger Hoffman <sooline@...> ha scritto: Cliff: I'm not very familiar with that chip...where would it be located? Thanks, and 73.... Roger, WB9BXT On Thursday, April 23, 2020, 09:42:44 AM EDT, Clif Holland <clif@...> wrote: Have you physically looked to confirm the Geihl Eprom is installed? It is not stock. -- Clif Holland KA5IPF www.avvid.com |
#294 Another easy way to check for the Geihl IC. Do a reboot. If it comes up at 14.000.00 USB it is stock Kenwood. IIRC the Geihl IC come up at 10.100 I could be wrong but it doesn't come up at 14.100 -- Clif Holland KA5IPF www.avvid.com |