If you would like to decode Morse code with an existing program:
My personal recommendation is Fldigi, which is a software modem that runs on most major operating systems, including Windows and Linux. Fldigi has a modem for "CW" (Continuous Wave), which can both send and receive Morse code. The program uses your sound card to communicate with your radio. To ...
Here's how to repair a Kenwood MC-59 microphone cable (ships with the TM-V71a, probably the 710, and a few LMR radios as well).
First, if you didn’t know already, behind the rubber boot at the end of the Kenwood MC-59 mic cable is a regular RJ-45 jack:
Step 0. If you want to avoid all this, the cord is part Kenwood E30-7543-18 at PacParts.com. (They also ...
"Tone", displayed as "T" on the main screen, selects tone encoder + carrier squelch (your HT will send a tone, selected by the TONE Freq menu, and receive any strong-enough signal, regardless of whether it has a tone.) The transmitted tone is necessary to "open up" most repeaters so that you can talk on them.
"CTCSS", displayed as "CT" on the main screen, ...
This image of the bottom side of the bracket was taken with a flatbed scanner. The depicted dimensions were taken separately using a caliper, not by measuring on the image. The white inner area is the paper over an as-yet-unused adhesive pad; the material of the bracket is black-painted metal.
Hannu OH1HAQ emailed me the true correct two-step answer:
Set VOX GAIN to 0: long press on VOX button, rotate MULTI knob to set the level to 0, long press on VOX button.
With VOX GAIN set to 0, noise picked up by the microphone will not key the transmitter. However, replaying from the voice keyer memory will still key the transmitter if VOX is ...
First of all, only Band A (left side) can be tuned to the aviation band; if you try to use Band B it will not work. Press the left "BAND SEL" button (volume knob). Then you should be able to use the tuning knob to tune to the frequency you want.
If it skips over the aviation band, then the first thing to check is that the aviation band is not masked. This ...
I found the TM-741A service manual. As shown on page 106, the battery can be seen looking into the case from the front after the display panel is removed. Luckily, the spare batteries from my dive computer will work; now I just have to open the radio and solder in a replacement!
Typically a good place to get discriminator audio is the "high" end of the squelch control. Unfortunately the TM-241A does not have a conventional squelch control, making it necessary to tap onto the board itself.
Pin 9 of IC1, an MC3372, is the output of the discriminator. If you can locate and solder to this pin it should give you the desired signal.
I am setting up a B2000, a TH-D72 and a 710GA.
The best practice is to set the APRS freq to 144.39 MHz in Band B then configure the data band of the TNC to B-Band. You can lock it as well.
Kenwood has "In Depth" Manuals for each model for APRS.
I assume you have extensively bench tested the kit and have not found any problems.
Having several years of experience with high altitude radios in the Alps, I would suspect that you are getting static build-up on the antenna that is glitching the radio.
A Polyphasor, or equivalent, to ground can mitigate static build up. Failing that, a couple of megohms ...
The ICOM gateway terminal mode is a unique mode. It allows you to configure the radio to use the radio, tethered to a computer through a USB cable, to route the communications through the computer, out to the Internet, to access a remote gateway. In this mode, the RF signal of the radio is not a factor since all communications are actually going through the ...
It likely uses the external speaker output because not all rigs (especially older ones) have an RX audio output pin. And even if a rig does, it's possible that the audio output is before de-emphasis is applied so the TNC wouldn't be able to decode reliably.
As Mike said, the circles represent the cable shield.
As far as the microphone ground, read here: ...
I have a TS440SAT, but have not disassembled it. I also have a TS940SAT, which is a larger, I believe slightly newer rig. This answer applied to the TS940SAT.
The TS940SAT and the TS440SAT have internal speakers. Foam is used in the speaker system in two ways.
The first is as the material which holds the speaker cone into the speaker frame. If this ...
Have you tried this in memory, program, and vfo mode? If there are no memories saved, it may squawk at you because there's nothing to scan. I suspect it will do the same if you try to scan in 'program' mode without the lower and upper frequency limits saved in memory channels 6 and 7 respectively for PG.S-1 and 8 and 9 for PG.S-2, though the manual doesn't ...
To disable Repeater AutoShift turn the power off. Press and hold both the VFO and REV keys while turning power on. Do this again to turn Autoshift back on.
The manual makes mention of using the SHIFT key to override the autoshift but I am not sure how this works.
I have multiples of this radio and have never had the occasion to need to use a non-standard ...
On most of TNCs you can dump the monitor settings by the "display monitor" (or "display m") command
BUDLIST OFF NONE
DAYSTR mm/dd/yy hh:mm:ss
LLIST OFF NONE
MBEACON ON <---- If on, monitors packets addressed to BEACON and ID
This fellow mentions that he planned to do this:
Install serial cable from TM-D710G in basement to office for a future project - computer control over radio frequency, etc.
But he may never have been successful. I do not see the TM-D710G listed in any of the transceiver control software lists:
Commander doesn't list
Ham Radio Deluxe doesn't list
Kevin Reid has the most important point-- +/-9.6 kHz is beyond the +/- 7.5 kHz bandwidth of the TS-2000 receive filters. Without first modifying the hardware (replacing filter), I would expect the receive signal to be distorted, quite possibly beyond use.
Ashish, you should be able to receive this using FM. I'm not sure what the BFSK mode of the TS-2000 is but the data should be visible in FM mode. You will then have an audio square wave (or rounded if there is some bit shaping).
If you feed the audio into a computer soundcard, you should be able to record the data with something like Audacity and see ...
You have two questions.
First answer is no, page 70 of the manual, the menu option is TOT and default as you've noticed is 10 and the options are 3, 5, or 10 minutes.
Second answer is you could rig up some array of 555s or a microcontroller such that it unkeys for half a second every nine minutes and nobody's going to notice but the rig TOT will reset.
I don't own a D710 myself, but I was looking at buying one, so this is from my understanding of the manual: no, the D710 does not have a dedicated APRS VFO. If you look at page PACKET-2 of the D710 manual, it describes selecting which "band" (A or B) is used as the data band.
I'm looking at the Service Manual for the TK-805D and it shows +13.8 Vdc on pin 1 and +5 Vdc on pin 6. Mind you, these readings are hand written by whom ever posted this manual.
Do you have the part number off the back of the microphone?
I know this is a 3 year old post and hopefully you ere able to get your answer.
I love this little radio, just don't ...