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7

Most of the common disadvantages for Baofengs et al have to do with usability (e.g. poor user interface, odd squelch performance). The actual reception and transmission power is just fine. The majority of the disadvantages are negated when working with APRS, since it's the APRS modem interacting with the radio rather than a human being. The main thing you'd ...


4

Some of the cheap HTs, which were designed for voice, key up the transmitter quite slowly, and the transmitter also stays on for quite a while after the PTT is released. At least my older Puxings behave this way - they require a long txdelay in the tracker (delay from PTT down to the start of data transmission), and there's also a long "tail" after the data. ...


4

I am looking for a recommendation of an inexpensive scanner radio that should be used to locate animals equipped with 433MHz locator beacons. First, let me clarify some terminology: you don't need a scanner, just a receiver. A scanner is a type of receiver which monitors a large range of frequencies, but you know the exact frequency of your beacon. The ...


4

There are a few ways the noise could be transmitted to the car radio, and the way to fix it will depend on how it's getting in there. Antenna Power or ground Other EMI If the transmission is swamping your radio's receiver, then it's not blocking the higher frequencies strongly enough. It might be worth looking at the output of the transmitter to see if it'...


4

After catching it again today, at 19:30 BST on 5.90mhz I looked it up on shortwaveschedule. It seems to be the lead-in call for Radio Romania International. Mystery solved. The introductory music & beacon can also be heard on this old recorded broadcast from 2011.


2

As mentioned in my comment, it appears that the software I'm using, gMFSK, is decoding the long tone as a letter "T", because there is a short pause between the tone beacon transmits and the message itself.


2

This is the sort of task for which it is at least easiest to do outside of the model of GNU Radio Companion. That is, you would take the generated code and instead of executing it directly, modify it — or, perhaps, load it as a module. First of all, I recommend changing from WX GUI to QT GUI. WX support in GNU Radio Companion is deprecated, and the ...


1

The only precedent that I can think of for using the ham bands for data beacons, where the data has nothing to do with either ham radio or emergency traffic, is weather station data over APRS. In that case the data is in very short infrequent bursts, and is just being relayed to an internet gateway, rather than being broadcast for general consumption. You ...


1

If you want to try and visualise the excellent advice from Kevin, look for http://www.homingin.com/intlfox.html "Introduction to ARDF -- Radio-Orienteering". The frequency may be different but the tools and techniques will be exactly the same.


1

If you don't have identification, then it's probably not a ham band item. The only exception to that rule is model aircraft controllers, and that is only for 6m, specific frequencies, and still doesn't apply. You probably want a Part 15 device. See the FCC rules, but basically you can make up to 5 without FCC approval (Conditions apply) for non-commercial ...


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