Hotspot Ful

Hotspot Ful

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hotspot ful

Spotful is an interactive video toolset for serious storytellers and empowered audiences.

Hotspot Ful

There appear to be 2 different types of duplex boards available on eBay. I chose two frequencies 6 MHz apart on the 70cms band, which is used by a repeater about km from me, but not used for any local repeaters.

The board was supplied with two small, cheep looking antennas, which I presume are designed for the MHz ISM band, and using these directly screwed into the SMA connectors, I found was the hotspot did not seem to work very well This is probably because of the desensitization of the Rx by the Tx. Using at least one external antenna resolved the desensitization problem, and the added benefit of connecting the Tx connector to an external antenna, is that the range of the hotspot should be increased so that it can be accessed from the garden, and up to around m down the street!

In some cases the audio would make a sort of squawk sound as it cut out. I came to the conclusion that perhaps there was a problem in the firmware which perhaps has a 1 minute timeout for these duplex boards By coincidence, around this time, I spoke to Steve K2GOG, who told me that he encountered similar issues on his duplex hotspots, but had fixed the problem by using passive cooling on the TCXO, and on the processor on his Raspberry Pi.

At this point I decided to raise an issue on the firmware GitHub repository, of Andy CA6JAU in the hope that he could shed some light on the problem, and after a few days, Andy confirmed that there was some sort of problem with the firmware, as he could reproduce the problem on his duplex hotspot, but was surprised that on one had noticed the bug before now.

The reason that the hotspot cuts out, is related to differences between master clock frequency in the hotspot and in the radio. Over time, while the radio is transmitting and the hotspot is receiving and re-transmitting, the hotspot Tx gets far enough out of sync with the radio until a point where the connection is dropped. Andy had managed to modify his firmware, to attempt to detect if there was an offset in the incoming and outgoing data, and cope with some miss-alignment, but all this did is delay the inevitable time when the radio and hotspot were so out of sync the connection gets dropped.

The good news however, is that the time before the hotspot cuts out, has been extended from 1 minute to around 4 minutes on most radios , and since a lot of DMR repeaters and servers have a 3 minute timeout, the server timeout will occur before the hotspot timeout. And as this timeout is effectively reset at the start of each over, the problem has effectively been solved.

Andy released firmware version 1. Now, just when you thought this article was complete, I have to report yet another, unresolved problem with these duplex hotspots… My TYT MD would not connect to the hotspot at all!

Discussing the problem with Andy, he initially thought the problem was the overall latency between the signal being received from the MD to when the hotspot responded transmitted back to the MD In an attempt to resolve this problem, I downloaded the source code for the firmware and the compiler toolchain, onto my Raspberry Pi, and modified the Make file, to use maximum code opimisation using the -O3 option , as this normally yields a reasonable increase in speed — but can sometimes stop code working completely.

Normally this is set to 50 and needs to be increased to around 55 to allow the MD to connect. I made this change and instantly found the MD would connect, however I noticed that every so often that the PiStar dashboard indicated that the MD was on Timeslot 1 when it was actually transmitting on Timeslot 2.

So its best to keep an eye on PiStar when you are transmitting, to make sure that you are on the TS you expect. Because if the hotspot is looking on TS1 and you are transmitting the audio on TS2, then the network gets no audio at all.

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DMR MMDVM duplex hotspot

There appear to be 2 different types of duplex boards available on eBay. I chose two frequencies 6 MHz apart on the 70cms band, which is used by a repeater about km from me, but not used for any local repeaters. The board was supplied with two small, cheep looking antennas, which I presume are designed for the MHz ISM band, and using these directly screwed into the SMA connectors, I found was the hotspot did not seem to work very well This is probably because of the desensitization of the Rx by the Tx. Using at least one external antenna resolved the desensitization problem, and the added benefit of connecting the Tx connector to an external antenna, is that the range of the hotspot should be increased so that it can be accessed from the garden, and up to around m down the street! In some cases the audio would make a sort of squawk sound as it cut out.

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Hotspot Ful

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