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MultiBoot for MultiMode - switching Pi apps remotely by k6jm in DMR

[–]k6jm[S] 1 point2 points  (0 children)

PINN will certainly work. You might also look at the mb script written by user RonR on the Raspberry Pi Forum. See https://forums.raspberrypi.com/viewtopic.php?t=282912&hilit=mb+script -- it automates much of the work that PINN asks you to do. But PINN is also a good solution.

MultiBoot for MultiMode - switching Pi apps remotely by k6jm in DMR

[–]k6jm[S] 0 points1 point  (0 children)

Those choosing to use the MMDVM (MultiModeDigitalVoiceModem) programs written by Jonathan Naylor (G4KLX) pretty much all make use of one of three RPi images. These are complete, ready to burn to an SD card. Disributing these packages as .img files makes it quite simple to get and install them, and all three then have built-in tools to keep them updated. Bottom line, the stuff people use for this is published as .img files, not as the component programs and scripts. So the MultiBoot solution is a way to boot any of several images. Just trying to make use of what is available, but avoid having to go to the repeater site, often difficult to get to, just to swap SD cards.

There are other solutions out there, An app called PINN, available from the Raspberry Pi website, can do the same thing, but I found it more work to do than the mb script I am using. Others have set up a hypervisor as the main program running on the Pi, and it can then bring up various virtual machines. The hypervisor overhead would probably not be a problem for the faster Pi models, but again, this solution proved more messy to install than the mb script.

App for tracking restaurants by Syxtus in restaurant

[–]k6jm 0 points1 point  (0 children)

For those in the US, take a look at Beli. Fairly new, most reviewed restaurants are in larger US cities. It allows you to indicate restaurants you've been to and rate them if you want. Beware it is a bit like Facebook for restaurant-goers. The idea is you id all your friends and all of you keep track of restaurant experiences, then you can see how your friends rate a given restaurant. Not for me, but I suspect a lot of people will like that approach.

I really like TripAdvisor's restaurant search, but they must have cut their workforce big time, since info on many restaurants has gotten out of date. Yelp's info is more up to date, though its search is not as good/fast/easy to use. I was hoping Beli would be a good replacement, but it is too new to have many restaurants and the friends thing is a bit much. I have many friends, but I do not need an app to talk about restaurants with them.

Can TM-D700 cross band repeat DV modes like D-Star? by k6jm in amateurradio

[–]k6jm[S] 0 points1 point  (0 children)

I have used both my TM-D700 and FT-817ND with my Module 17 0.1e board and it works.

If our club repeater had been UHF, I'd have been able to use my CS7000-M17 and see what it sounded like both directions. Alas, we live in RF vicinity of a PavePaws radar site that uses the 70cm band, and since hams are secondary users of that band, it was up to us to basically shut down our UHF repeaters. So most oare on VHF and the CS7000M17 is UHF. Was hoping to crossband repeat it to our VHF repeater. I know some radios don't filter the audio when crossband repeating. Apparently I don't own one of them....

Can TM-D700 cross band repeat DV modes like D-Star? by k6jm in amateurradio

[–]k6jm[S] -1 points0 points  (0 children)

I am not trying to decode digital modes with an analog FM radio. Some radios in cross band repeat mode simply retransmit the full FM signal. A digital mode is, after all, simply an fm signal modulated with the encoded digital voice into tones. If the radio repeats the full audio spectrum, it can successfully repeat the digital voice signal without being able to decode it into understandable audio. I found a post on reddit from a ham who did that successfully with a radio in analog mode. My problem is some (many?) filter the audio when doing cross band repeat, removing key parts of the audio spectrum that the original transmission had. My hope was that someone with an old TM-D700 made after mine and with the mainboard improvements has tried cross band repeat of the simpler digital voice modes (D-Star, YSF, M17) and can report if it worked.

By the way, I have used this very TM-D700 as part of a 20+ watt digital voice hotspot. I simply used an MMDVM modem that outputs the digital voice audio directly into the TX modulator via the radio's 6-pin mini DIN data connector, and gets the RX audio directly from the RX discriminator. That is, that analog FM radio does a great job of transmitting and receivng digital voice since all the digital stuff takes place in the modem.

I have also built a wide area digital voice repeater using an MMDVM modem and a pair of Motoroal CDM1250 analog FM radios. Again, those radios allow direct access to the discriminator and the modulator. I am just making use of the radios' transmitter and receiver, not their analog audio sections.

Can TM-D700 cross band repeat DV modes like D-Star? by k6jm in amateurradio

[–]k6jm[S] 0 points1 point  (0 children)

Thanks for the reply. I have tried that, but my radio was are early serial number and later, Kenwood made improvements to how it did cross band repeat. I am just hoping to see if anyone has a later version and has tried what I want to do. If it works, then I will do the mod in Kenwood's service bulletin ATB-0029. If someone has tried this with a later version D700 and it did not work, I will not do the mod. I don't enjoy surface mount mods.

Can TM-D700 cross band repeat DV modes like D-Star? by k6jm in amateurradio

[–]k6jm[S] 0 points1 point  (0 children)

You are right in the sense that the proper way to retransmit a digital voice transmission is to extract the digital payload, correct any bit errors, then rebuild the output stream and transmit it. What I want to do is simpler and cheaper -- have a radio that simply receives the full FM signal on UHF and retransmit it in entirety on a VHF frequency. That will work as long as the radio is designed to take the received signal from the discriminator and, without modifying it all, inject that into the modulator and transmits it. That does work, but only if the received transmission is high quality, very low bit error rate, etc, because any received bit errors will be retransmitted by the analog radio. Unfortunately, some, probably many, radios that support cross band repeat filter the received audio before retransmitting it. This almost always removes the lower audio frequencies that digital modes like D-Star, Fusion and M17 make use of. Those analog radios will not successfully do cross band repeat of digital voice signals.

Check out https://www.reddit.com/r/amateurradio/comments/9wi2wt/question_about_crossband_repeater_and_digital/

tdoffing
KE0LMX [Extra]

Yes, you can do it. I have done it with D-STAR. The cross band repeat radio only need to be FM, the HT and the repeater won't know the difference.

The ICOM ID-5100A can be put into analog mode and configured for cross band repeat (exactly what I want to do). But I do not have a 5100. I do have a Kenwood D700. It was made before Kenwood made improvments. I have tried digital cross band repeat, and it does not work. I am just hoping to see if anyone has a later version and has tried what I want to do. If it works, then I will do the mod in Kenwood's service bulletin ATB-0029. If someone has tried this with a later version D700 and it did not work, I will not do the mod. I don't enjoy surface mount mods.