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Re: Pi-4, Dire Wolf and Signal Link---Where did the "Audio Device Settings" Go? Mike Erstad #12404 Hi John, I’m trying to configure direwolf to use my Signal Link usb and I need the “Audio Device Settings” that are normally found in Preferences… I just recently found how to install the Audio Device Settings back into the Raspberry Pi… Code: Select all `sudo apt install -y pimixer` And then to launch it: Code: Select all `pimixer` This allows me to choose and set up Audio Codec Device… But as you mentioned in the “latter” I’ll try that to see if I don’t need this Audio Device Settings application or Preference and use your method... Thanks Very Much Mike On Oct 25, 2020, at 12:23 PM, John <jbelstner@...> wrote: Hi Mike, My setup is also Pi4, Direwolf, xastir and Signalink USB. I'm not sure I understand your question, though. Is the Pi4 trying to play system sounds out of your Signalink or are you trying to configure direwolf to use the Signalink? If the former, use raspi-config as described here (https://www.raspberrypi.org/documentation/configuration/audio-config.md) to send system sounds out of your HDMI or headphones output. If the latter, use the"arecord -l" and "aplay -l" commands to discover which device number your Signalink was assigned and "alsamixer" to adjust the settings (if needed). Portions of this video (https://youtu.be/9Ya0C308TQA) are helpful in figuring out how to configure the direwolf.conf file based on the values returned from the"arecord -l" and "aplay -l" commands. I hope this helps. 73 John - W9EN On Sun, Oct 25, 2020 at 9:42 AM Mike Erstad <erstadmr@...> wrote: Maybe I should be asking: How do you install the "Audio Device Setting" found in Preferences... There missing whether I use a Pi-3 or Pi-4 Thanks Much, Mike
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Re: Pi-4, Dire Wolf and Signal Link---Where did the "Audio Device Settings" Go? John #12403 Hi Mike, My setup is also Pi4, Direwolf, xastir and Signalink USB. I'm not sure I understand your question, though. Is the Pi4 trying to play system sounds out of your Signalink or are you trying to configure direwolf to use the Signalink? If the former, use raspi-config as described here (https://www.raspberrypi.org/documentation/configuration/audio-config.md) to send system sounds out of your HDMI or headphones output. If the latter, use the"arecord -l" and "aplay -l" commands to discover which device number your Signalink was assigned and "alsamixer" to adjust the settings (if needed). Portions of this video (https://youtu.be/9Ya0C308TQA) are helpful in figuring out how to configure the direwolf.conf file based on the values returned from the"arecord -l" and "aplay -l" commands. I hope this helps. 73 John - W9EN toggle quoted messageShow quoted text On Sun, Oct 25, 2020 at 9:42 AM Mike Erstad <erstadmr@...> wrote: Maybe I should be asking: How do you install the "Audio Device Setting" found in Preferences... There missing whether I use a Pi-3 or Pi-4 Thanks Much, Mike
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Re: Pi-4, Dire Wolf and Signal Link---Where did the "Audio Device Settings" Go? Mike Erstad #12402 Found It..... I believe pimixer may have been removed from latest Raspbian for some reason. You can install it with: Code: Select all `sudo apt install -y pimixer` And then to launch it: Code: Select all `pimixer`
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Re: Pi-4, Dire Wolf and Signal Link---Where did the "Audio Device Settings" Go? Mike Erstad #12401 Maybe I should be asking: How do you install the "Audio Device Setting" found in Preferences... There missing whether I use a Pi-3 or Pi-4 Thanks Much, Mike
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Martin Cooper #12400 See the 2nd photo here for what the HamProjects folks did with their BRIAN product. https://hamprojects.info/brian/#cmtoc_anchor_id_5 That's essentially the same path that I've followed. Good question about 9600 baud packet. The DINAH page talks about selecting between 1200 and 9600, and the PCB has a jumper on the bottom for it, so one could assume that it's been tested. Martin. KD6YAM toggle quoted messageShow quoted text On Fri, Oct 23, 2020 at 9:26 AM Lawrence Macionski via groups.io <am_fm_radio=yahoo.com@groups.io> wrote: Martin... Additionally the DINAH comes with a 6pin mini DIN to 6 pin mini DIN cable to plug directly into about 25 radio's without modification. I have built a number of USB sound FOB's and I find that ,"dead bug" soldering things like PTT transistors and then encapsulating the project to insure good mechanic-ability.The DINA offers a PC board that all radio connections leaving the board go through a 6pin DIN socket to a pre-made cable. I bet you solder the cable to "dead bug" points and solder pads of removed audio jacks. I've seen those solder pads lift. Look at it this way. For a few dollars more- You get a known good sound chip, not some unknown "fake" chip knockoff. It plugs into the RPI.. It has a socket for the cable and so does your radio. Do you don't have to make a cable. When it come to trouble shooting, You can by substitution quickly determine where the problem lies. After all the SD card is socketed. So you can try an other SD card, another RPI, another USB port, another DINAH, another Cable, another radio... You never know what is in the $3 USB sound FOB, and the minute it's cracked open it's yours. Finally, Given my introduction into ALLSTAR was with locals using DMK URIx's at $85 a copy.. A DINAH at $35 seems like a bargain and do it your self EBAY special my not be worth the time. Plus your supporting a Michigan cottage entrepreneur.
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. KP3FT #12399 It's true the same thing can be fabricated cheaper, which is what I do here, but for $35 the DINAH is actually a good deal. A big plus with the DINAH is that the onboard GPIO pin on the CM108/119 chip which can be used for PTT by Direwolf, SoundModem, and others, is already set up for PTT. It's extremely difficult to solder to that pin when home-brewing... and the pin isn't soldered to the board itself on the Ebay sound cards (at least the ones I've worked on), so it breaks off very easily if the wire isn't secured first. One trick when homebrewing with the Ebay cards is to not remove the IN/OUT jacks and instead loop the wires through them for strain-relief, and solder to the pads on top of the jacks.
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Larry Macionski #12398 Martin... Additionally the DINAH comes with a 6pin mini DIN to 6 pin mini DIN cable to plug directly into about 25 radio's without modification. I have built a number of USB sound FOB's and I find that ,"dead bug" soldering things like PTT transistors and then encapsulating the project to insure good mechanic-ability.The DINA offers a PC board that all radio connections leaving the board go through a 6pin DIN socket to a pre-made cable. I bet you solder the cable to "dead bug" points and solder pads of removed audio jacks. I've seen those solder pads lift. Look at it this way. For a few dollars more- You get a known good sound chip, not some unknown "fake" chip knockoff. It plugs into the RPI.. It has a socket for the cable and so does your radio. Do you don't have to make a cable. When it come to trouble shooting, You can by substitution quickly determine where the problem lies. After all the SD card is socketed. So you can try an other SD card, another RPI, another USB port, another DINAH, another Cable, another radio... You never know what is in the $3 USB sound FOB, and the minute it's cracked open it's yours. Finally, Given my introduction into ALLSTAR was with locals using DMK URIx's at $85 a copy.. A DINAH at $35 seems like a bargain and do it your self EBAY special my not be worth the time. Plus your supporting a Michigan cottage entrepreneur.
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Re: configure tnc-pi on polaric server(java app) k - HJ4JGG #12397 hi Randy:VE3YRG Yes, this is one of the problems that I detect. you cannot use pitnc_getparams or pitnc_setparams if RF is enabled on the polaric server. This will generate conflict with the port. if you use it, polaric is not able to open it because there is a lock file from another application. N5XMT yes it take me some time to get this im using /dev/ttyS0 thats point to serial0 David:KI6ZHD 2. 5. yes i enable serial port and disable serial console, so i can access tnc pi , 3. ttysS80 was a test to simlink another number. . . . . . 4. it's definitely a ports/user/group problem 6. Last, no graphical environment, only console 1. actual working permissions it is currently working, but I really don't know which of all the changes was the solution. : D I attach the .bash_history here all the log https://pastebin.com/raw/wT3HuLPe these are the changes that i think helped fix the problem. sudo chmod 666 /dev/serial0 sudo chown root:polaric /dev/serial0 sudo usermod -aG uucp polaric sudo usermod -aG uucp pi sudo chmod o+rw /dev/ttyS0 I'm going to do another laboratory to configure another rpi with tnc_pi and verify in order which commands should be used, or if there is no need to make any changes in the configuration: S here current setup https://www.flickr.com/photos/atarvaneitor/50520108011/ Thanks for the help pd: here a ppt about polaric APRS server http://elafargue.github.io/aprs-box/ toggle quoted messageShow quoted text El 22/10/2020 a las 9:39 a. m., Randy Greig escribió: Is it possible that the port is open in another application and java just says that it cannot find it? On Thu, Oct 22, 2020 at 8:55 AM k - HJ4JGG via groups.io <kalashnikov=compelect.com.co@groups.io> wrote: hi i am configuring an app called polaric server, it's like a APRS node whit web interface and other functionalities. a java app. using a TNC-PI v1 connected to a Rpi3b+, via serial port. i can access to tncpi via serial0 https://user-images.githubusercontent.com/44566/96772497-d55ce300-13a8-11eb-98c3-e82308866790.png the java app can not access the port serial0 error ----- `okt. 21 14:19:10 ERROR (TncChannel): [rf0] Serial port /dev/serial0 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834` ---- here port serial0 permission https://user-images.githubusercontent.com/44566/96772411-b52d2400-13a8-11eb-874f-d0d5e627c5a2.png How is the correct way to configure the port permissions so that the java application can access the port? about polaric server http://aprs.no/dokuwiki/doku.php/polaricserver https://github.com/PolaricServer Thanks for the help juan HJ4JGG
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Bill Vodall #12396 Have they been tested at 9600 baud packet? It appears there are caps in the audio paths so that may limit the bandwidth needed. Thanks, Bill toggle quoted messageShow quoted text On Thu, Oct 22, 2020, 6:51 AM Lawrence Macionski via groups.io <am_fm_radio=yahoo.com@groups.io> wrote: The point I was making is DINAH can be used with / for DIREWOLF. It's been done and reported elsewhere. DINAH cost as a kit or Assembled is far less than a MFJ TNC-PI. https://Hamprojects.info introduced a PI HAT SHARI the last few days. So interesting things are taking place.
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Re: configure tnc-pi on polaric server(java app) Randy Greig #12395 Is it possible that the port is open in another application and java just says that it cannot find it? Randy VE3YRG toggle quoted messageShow quoted text On Thu, Oct 22, 2020 at 8:55 AM k - HJ4JGG via groups.io <kalashnikov=compelect.com.co@groups.io> wrote: hi i am configuring an app called polaric server, it's like a APRS node whit web interface and other functionalities. a java app. using a TNC-PI v1 connected to a Rpi3b+, via serial port. i can access to tncpi via serial0 https://user-images.githubusercontent.com/44566/96772497-d55ce300-13a8-11eb-98c3-e82308866790.png the java app can not access the port serial0 error ----- `okt. 21 14:19:10 ERROR (TncChannel): [rf0] Serial port /dev/serial0 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834` ---- here port serial0 permission https://user-images.githubusercontent.com/44566/96772411-b52d2400-13a8-11eb-874f-d0d5e627c5a2.png How is the correct way to configure the port permissions so that the java application can access the port? about polaric server http://aprs.no/dokuwiki/doku.php/polaricserver https://github.com/PolaricServer Thanks for the help juan HJ4JGG
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Martin Cooper #12394 And the point I was making is that DINAH is basically just a USB sound fob, so of course it can be used with Direwolf, just as almost all sound cards can. As for cost, I personally feel that $35+ for a USB sound fob kit is rather a lot when I can buy one that works well for a couple of dollars on eBay and modify it for a dollar or two in parts. However, I do realise that many will appreciate the prebuilt and pretested nature of DINAH, especially if they want an Allstar interface. I do agree that interesting things are happening, and that the PiHat is one of those interesting things. Martin. KD6YAM toggle quoted messageShow quoted text On Thu, Oct 22, 2020 at 6:52 AM Lawrence Macionski via groups.io <am_fm_radio=yahoo.com@groups.io> wrote: [Edited Message Follows] The point I was making is DINAH can be used with / for DIREWOLF. It's just been done and reported elsewhere. DINAH cost as a kit or Assembled is far less than a MFJ TNC-PI. https://Hamprojects.info introduced a PI HAT SHARI the last few days. So interesting things are taking place.
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Re: configure tnc-pi on polaric server(java app) David Ranch #12393 I have a few ideas for you since you sited you have the TNC-Pi running in serial port mode to a Rpi 3B+: 1) You listed the permissions of /dev/serial0 but that's only a symlink. What is the permissions of /dev/ttyS0? 2) Is the serial console function on your Rpi still enabled if you're using the TNC-Pi in serial mode? It must be disabled to not interfere in communicating with the TNC-Pi 3) Your cited error of "RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:28 ERROR (TncChannel): [rf0] Serial port /dev/ttyS80 not found" talks about port /dev/ttyS80. Why S80? Is that a typo in your config? Typo in your error report? 4) For the Unix account you're logged into, is it apart of the "dialout" group? This is commonly required when not running programs via the root account. 5) Did you disable bluetooth and reconfigure the hardware BCM serial port to connect to the GPIO header? https://www.raspberrypi.org/forums/viewtopic.php?t=253552 6) What distribution are you running on your Raspberry Pi? Do you have gpsd or modem-manager installed? Either of these might be trying to take over the serial port by default. --David KI6ZHD toggle quoted messageShow quoted text On 10/22/2020 06:43 AM, k - HJ4JGG via groups.io wrote: i just try to use symlink from ttyS0 to serial0 and get this error --- okt. 22 08:38:48 ERROR (TncChannel): [rf0] Port /dev/ttyS0 is currently in use okt. 22 08:39:25 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:26 INFO (TncChannel): [rf0] Channel closed okt. 22 08:39:28 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:28 ERROR (TncChannel): [rf0] Serial port /dev/ttyS80 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834) okt. 22 08:39:45 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:48 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:48 ERROR (TncChannel): [rf0] Serial port /dev/ttyS0 not found ----- El jue., 22 oct. 2020 a las 8:32, k - HJ4JGG via groups.io (<kalashnikov=compelect.com.co@groups.io>) escribió: hi yes im using 19200 El jue., 22 oct. 2020 a las 8:16, Jim WB9QPM via groups.io (<jhudson1=consolidated.net@groups.io>) escribió: What speed are you using to talk to the PITNC? Try 19200
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Re: configure tnc-pi on polaric server(java app) N5XMT #12392 Symlinks are already set up by the raspberry pi OS. You should have 2, /dev/ttyAMA0, and /dev/ttyS0. One should point to /dev/serial0 and the other to /dev/serial1 Get BlueMail for Android toggle quoted messageShow quoted text On Oct 22, 2020, at 07:04, "k - HJ4JGG via groups.io" <compelect.com.co@groups.io target=_blank>kalashnikov=compelect.com.co@groups.io> wrote: i just try to use symlink from ttyS0 to serial0 and get this error --- okt. 22 08:38:48 ERROR (TncChannel): [rf0] Port /dev/ttyS0 is currently in use okt. 22 08:39:25 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:26 INFO (TncChannel): [rf0] Channel closed okt. 22 08:39:28 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:28 ERROR (TncChannel): [rf0] Serial port /dev/ttyS80 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834) okt. 22 08:39:45 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:48 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:48 ERROR (TncChannel): [rf0] Serial port /dev/ttyS0 not found ----- El jue., 22 oct. 2020 a las 8:32, k - HJ4JGG via groups.io (<kalashnikov=compelect.com.co@groups.io>) escribió: hi yes im using 19200 El jue., 22 oct. 2020 a las 8:16, Jim WB9QPM via groups.io (<jhudson1=consolidated.net@groups.io>) escribió: What speed are you using to talk to the PITNC? Try 19200
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Re: configure tnc-pi on polaric server(java app) k - HJ4JGG #12391 i just try to use symlink from ttyS0 to serial0 and get this error --- okt. 22 08:38:48 ERROR (TncChannel): [rf0] Port /dev/ttyS0 is currently in use okt. 22 08:39:25 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:26 INFO (TncChannel): [rf0] Channel closed okt. 22 08:39:28 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:28 ERROR (TncChannel): [rf0] Serial port /dev/ttyS80 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834) okt. 22 08:39:45 INFO (KissTncChannel): [rf0] Closing channel okt. 22 08:39:48 INFO (TncChannel): [rf0] Activating... RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyS0: El fichero yaokt. 22 08:39:48 ERROR (TncChannel): [rf0] Serial port /dev/ttyS0 not found ----- toggle quoted messageShow quoted text El jue., 22 oct. 2020 a las 8:32, k - HJ4JGG via groups.io (<kalashnikov=compelect.com.co@groups.io>) escribió: hi yes im using 19200 El jue., 22 oct. 2020 a las 8:16, Jim WB9QPM via groups.io (<jhudson1=consolidated.net@groups.io>) escribió: What speed are you using to talk to the PITNC? Try 19200
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Larry Macionski #12390 Edited The point I was making is DINAH can be used with / for DIREWOLF. It's just been done and reported elsewhere. DINAH cost as a kit or Assembled is far less than a MFJ TNC-PI. https://Hamprojects.info introduced a PI HAT SHARI the last few days. So interesting things are taking place.
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Re: configure tnc-pi on polaric server(java app) k - HJ4JGG #12389 hi yes im using 19200 toggle quoted messageShow quoted text El jue., 22 oct. 2020 a las 8:16, Jim WB9QPM via groups.io (<jhudson1=consolidated.net@groups.io>) escribió: What speed are you using to talk to the PITNC? Try 19200
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Re: configure tnc-pi on polaric server(java app) Jim WB9QPM #12388 What speed are you using to talk to the PITNC? Try 19200
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configure tnc-pi on polaric server(java app) k - HJ4JGG #12387 hi i am configuring an app called polaric server, it's like a APRS node whit web interface and other functionalities. a java app. using a TNC-PI v1 connected to a Rpi3b+, via serial port. i can access to tncpi via serial0 https://user-images.githubusercontent.com/44566/96772497-d55ce300-13a8-11eb-98c3-e82308866790.png the java app can not access the port serial0 error ----- `okt. 21 14:19:10 ERROR (TncChannel): [rf0] Serial port /dev/serial0 not found gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:269) at no.polaric.aprsd.TncChannel.connect(TncChannel.java:105) at no.polaric.aprsd.TncChannel.run(TncChannel.java:153) at java.base/java.lang.Thread.run(Thread.java:834` ---- here port serial0 permission https://user-images.githubusercontent.com/44566/96772411-b52d2400-13a8-11eb-874f-d0d5e627c5a2.png How is the correct way to configure the port permissions so that the java application can access the port? about polaric server http://aprs.no/dokuwiki/doku.php/polaricserver https://github.com/PolaricServer Thanks for the help juan HJ4JGG
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Re: New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Martin Cooper #12386 DINAH has been around for a while, as have its relatives, BRIAN and SHARI. If you've seen any of the numerous posts around the web about how to modify a USB sound fob for Allstar, that's essentially what DINAH is, except that they've designed their own USB sound PCB with those mods built in, and packaged it with a 6-pin mini-DIN socket for convenience. BRIAN is effectively DINAH packaged together with the innards of a Baofeng BF-888S radio. SHARI is the same thing, but using a NiceRF SA818 instead of the Baofeng. Martin. KD6YAM toggle quoted messageShow quoted text On Wed, Oct 21, 2020 at 12:18 PM Lawrence Macionski via groups.io <am_fm_radio=yahoo.com@groups.io> wrote: I have been using a HAM RADIO PROJECTS DINAH to access ALLSTAR on a Raspberry PI. Excellent product, Excellent cottage industry out of Michigan. Just today on www.groups.io --DINAH blog, -Mike KJ7OWD indicated that the DINAH works perfect with DIREWOLF as a APRS I-GATE... https://groups.io/g/DINAH/topics This was just posted TODAY and CAVEAT -all of it's capabilities have not been uncovered or documented. I have run the TNC-PI with XASTIR years ago, but understand DIREWOLF is more robust. The DINAH is available as a kit ($35+$8 ship), or assembled ($45+$8ship) and comes with a 6pin to 6 pin DIN cable that plugs into many 2-way ham radio data ports, such as my Yaesu FT-817 or Kenwood TM-V7A. Preliminary as it is, it is less expensive that the MFJ. Info on the DINAH https://hamprojects.info/dinah/ They also make a SHARI - same idea except it comes with a 300-500MW VHF or UHF transceiver for local operation. So let the experimenting begin..... Larry W8LM
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New MFJ TNC-PI (maybe) ALTERNATIVE at Less Cost. Larry Macionski #12385 I have been using a HAM RADIO PROJECTS DINAH to access ALLSTAR on a Raspberry PI. Excellent product, Excellent cottage industry out of Michigan. Just today on www.groups.io --DINAH blog, -Mike KJ7OWD indicated that the DINAH works perfect with DIREWOLF as a APRS I-GATE... https://groups.io/g/DINAH/topics This was just posted TODAY and CAVEAT -all of it's capabilities have not been uncovered or documented. I have run the TNC-PI with XASTIR years ago, but understand DIREWOLF is more robust. The DINAH is available as a kit ($35+$8 ship), or assembled ($45+$8ship) and comes with a 6pin to 6 pin DIN cable that plugs into many 2-way ham radio data ports, such as my Yaesu FT-817 or Kenwood TM-V7A. Preliminary as it is, it is less expensive that the MFJ. Info on the DINAH https://hamprojects.info/dinah/ They also make a SHARI - same idea except it comes with a 300-500MW VHF or UHF transceiver for local operation. So let the experimenting begin..... Larry W8LM
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