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Tag: Motorola

DMR Repeater

DMR Repeater

I would never die for my beliefs because I might be wrong. (Bertrand Russell)

Max IW0GXY is a great friend but he is also a problem (to me) at the same time; it is solely his fault if I reach the point to dig the internet to find a way to build a home-brew DMR repeater.

We are evaluating several ways ranging from a ready-made Hytera repeater for 1800 Euro to a cheap experimental MMDVR board plus two Motorola GM300 or two Kenwood TK-805.
Honestly there is absolutely nothing in between unless you want to consider the Motorola DR3000 as a valid solution which costs more than the Hytera compare to a brand new Motorola or like an Hytera compare to a used device on eBay with absolutely zero warranty, so Hytera is more convenient than a Motorola and MMDVM is more convenient in absolute.

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Obtorto collo, DMR

Obtorto collo, DMR

In cooperation with IW0GXY (formerly ON4GXY) Massimiliano, I started to explore the non-sense of the DMR technology. We bought a pair of Tytera MD-380 handhelds and a couple of DV4mini and we will try to experiment on such technology. I got my ID 2066034 which is required by the repeater in order to grant access to the equipment.

The plan is to explore the radio and try to catch the flavor of it and then, eventually, install an access point or a repeater.

Stay tuned…

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ON0MON back online

ON0MON back online

The repeater is back operational and working perfectly. There are no more Raspberry Pi for me; even if the repeater is experimental and subject to outages, it should not be for an unreliable hardware. Raspberry Pi are good for playing with and for home applications, not for a 24/7 repeater.

The server is now a Intel Xeon running at 3GHz with “just” 4GB Ram and a 64bit Operating System.

Ah… just because you spent your time reading this post, here is a teaser: soon there will be some big changes, so now, more than before, stay tuned! 🙂

Unexpected outage – Work in progress

Unexpected outage – Work in progress

The first Raspberry PI broke a week before the winter holidays, luckily I had a second Raspberry PI and so by simply swapping the memory card I was able to restore the repeater in a couple of minutes.
Today the second Raspberry Pi decided to stop working so I’m moving everything on a spare computer I have but it will be based on Windows due to some hardware incompatibilities with Linux.

So, ON0MON is work in progress, expecting to be back no later than tonight, 1st Feb 2015.

Stay tuned.

100% Service UP

100% Service UP

Holidays are over and everything is back operational.
I’m considering to shutdown this website, quite useless as there are no real feedback and no real benefits and move to the more common Facebook platform. Twitter accounts are already setup…

Hey you two people (spammers excluded) out there that are reading this blog time by time: if one day it will be unreachable try again after a couple of days, if still unresponsive means I shutdown the website. 🙂

ON0MON Activation

ON0MON Activation

As I wrote on the previous message, I’ve been for three weeks roaming around Europe. So I went back and I just recalled the fact I gave the postal box key to a friend in order to collect the mailing a couple of times per week. There were some leaflet and some envelope in the mailbox but I decided they could wait for a couple of days, till monday to be read (and bills get paid).
Today the friend show up at my house, he notice the truck parked at the common parking lot and understood we were at home, so he brought the mailbox key to us with the mail (and bills).

One envelope caught my attention, it had BIPT on the top left side of it… I knew what was inside but I had no strength to open it… my son told me I had a big smile on my face while I was staring at the envelope and he become curious about the content as well.

It is the repeater license for ON0MON and I’ve been granted APRS and DSTAR capabilities!

I conducted some tests with my call sign for a certain period but everybody was saying the repeater permit and call would take over a year to get granted, so I was not in hurry to setup everything and I was considering the infrastructure as testing equipment.

So I started the APRS Gateway, changed the call and password and now ON0MON is operational on 144.800 for APRS operations.

The DSTAR capability will take a couple of days before being operational. I setup two different DSTAR repeaters, one is based on 2x Motorola GM900, UHF duplexer/cavity, embedded power supply and DVRPTR V2 board OLED Display version, max power 25W.
The second one is based on a modified 2x Standard C-5608 + Dutch Star GPSK Modem + 35A Switching Power Supply.
Both are feeding a vertical antenna on top of 15m tower.

Frequencies for the DSTAR Repeater are:

Frequency: 439.1375 MHz
Shift: -7.6 MHz

Someone once stated I decided to stay on the wrong part of Belgium… well, it looks like something made that assumption to be wrong and I’m pretty sure he will be happy to be wrong on that statement. 😉

I’m thankful to the UBA for the support they are providing in order to activate the repeater, a special thanks goes to Filip ON4PC (UBA Repeater Manager). He is doing a tough job and language barriers are not helping the management of the structure. We had some arguments in the past and I hope they were constructive for our activities.

eBay vs Amazon

eBay vs Amazon

I’m an Amazon addicted, doesn’t matter where is the Amazon shop, it can be .co.uk, .es., .it., .com, I’m buying from Amazon.

Following the great deal at the Veron Ham Fest I was looking for a RIB adapter to reprogram the Motorola GM-900 Radio to the proper frequencies and conduct some tests.

I went to Amazon and found a complete RIB programmer (RIB+Cable) for 55 Euro plus 15 Euro Shipping and Handling… quite expensive considering the amount I paid for the repeater itself (90 Euro) and the fact I will use that programmer just one time.

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