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6

The manual, on page 56 says: TX monitor allows you to monitor the on-going transmission sound. This is convenient when you want to check the modulation sound quality of the transmission. In FSK mode, you can monitor the FSK signal that the transceiver is transmitting. 1 Press and hold [PWR (TX MONI)]. • The current TX monitor setting appears on the sub-...


3

I found a list of specifications for the TS-480SAT giving the matching range as 16.7 Ω – 150 Ω. Another list of specifications for the TS-870SAT says that model's matching range is 20 Ω – 150 Ω. Both ranges roughly correspond to a 3:1 SWR, which is typical for antenna tuners built into transceivers. External antenna tuners generally offer more tuning ...


3

I took it apart and found a transistor that had been blown apart, pictured below (the black one with its metal innards showing), likely from a scenario described by @rclocher3. This is the NPN transistor that supplies voltage to the blue PNP transistor and should be switching based on its base input but instead is supplying a constant 5V. No surprise there, ...


2

The tone values for Tone mode and CTCSS mode are stored separately in the TM-V71A. If you set the value when you set up for tone and then change into CTCSS mode, you'll be back at the default 88.5. Make sure to set the tone value to your desired tone after entering CTCSS mode.


2

I'm not quite sure why things worked in today's testing, possibly I was just in a dead zone yesterday. Here's the setup that's working though: DRA-50 is plugged into radio's "Data" port (on main body) and into laptop. This is the port for using an external TNC, which is indicated by a plain 'D' next to the power level indicator on whichever band it'...


2

In the keyer, PNP transistor Q4 should be on when the keyer is supposed to be keyed. I assume that the transceiver's key jack goes to a CMOS high-impedance input and has a pull-up resistor, and that the key jack's sleeve terminal is tied to ground. If all that is correct, and if the keyer is working correctly, then the positive output of the terminal ...


2

Echolink allows repeaters to be connected over the internet, and also allows licensed hams with computers to connect to the system directly without using a radio. So there are two ways to participate: Find a local repeater that is connected to the Echolink system, and access that repeater with your radio. Download, install, and run the Echolink software on ...


2

According to the manual, it says "Appears while using the External data band", and all of the images of the display in the manual show it only appearing on the B band. However, menu setting (according to the manual, again) 517 allows you to set how the external TNC data band setup is defined (A band, B band, Tx on A and Rx on B, or Tx on B, Rx on A)...


2

Unless you tried to transmit without an antenna, it should be fine. If the radio is in receive mode without an antenna, it won't hurt it. But if you transmit without an antenna, especially at high power, the high SWR could damage the final amplifier in the radio.


2

The origin of this connector is Kenwood. We work with Kenwood and build custom headsets for Kenwood. This link is pretty much up to date and definative. https://www.wildtalk.com/knowledge-base/kenwood-2-pin-wiring-data/ The 5V pin has varied over time. Initially this was via a 100 ohm limiting resistor to provide power to an external VOX unit. More recent ...


2

FWIW: The Baofeng UV-5R HT supplies 3.3V through 100(*) ohms on the tip of the 3.5mm connector, not 5V as documented above. Also, the PTT is pulled up thru 10K to 3.3V, and the MIC+ connection line also has a more complex (constant current source?) pullup to 3.3V. [This is nice, as the PTT line can directly connect to a Raspberry Pi GPIO pin!] There's a (...


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