My old and very good friend Enzo (Vincenzo – IU7ACP) has just build a single face MMDVM modem for testing. I will receive the board in the next few days and start some tests with some Motorola and Kenwood radio to see how it works. There are no plans for a mass production at the moment. I will deal with Enzo to have it Open Source with all the diagrams published for everybody.
ON0MNS – OPERATIONAL QRG: 145.7125 MHz, Shift -600KHz, Tone 74,4Hz
Mode: C4FM and FM Analog, Wires-X Node 17165 – Connected to Room 27259 (ON0LRG)
ON0MON – OPERATIONAL QRG: 439.1125 MHz, Shift -7.6MHz, no tone
Mode: DSTAR (Default DCS011 D) – APRS 144.800 MHz (Digipeater + iGate)
ON0??? – IN PREPARATION QRG: <UHF> MHz, mode DMR
May 21 2016
May 15 2016
DMR, C4FM, DSTAR, DPMR, Portable Kit composed by:
- Raspberry Pi 2 + LCD Display touchscreen
- DV4Mini Dongle + Mini antenna
- RF Wireless Keyboard with touchpad
- Original Raspberry WiFi Dongle
- 2.2A USB Power Supply
- Cables, patches & card reader
- All in a Pelicase waterproof floating box
It actually hooks up to my cellphone configured in Hot Spot mode and from there to the 4G or 3G Network and does the job. Next additions will be a standalone 4G or 3G access point and a Power Bank for a totally independent setup. Stay tuned!
Mar 13 2016
My son (ON3II) and I just started building the mcHF SDR Transceiver project form m0nka (http://www.m0nka.co.uk).
It is an interesting project and honestly quite difficult to complete even using the pre-populated boards.
There are so tiny components such as the coils and some SMD integrated circuit which are requiring a proper SMD soldering station. A reworking station might do the job but the risk of de-soldering another component installed nearby is very high.
The radio itself costs 259 GBP plus 10 GBP for the shipping in Europe which converts to 350 Euro circa, not a bargain but still a funny project. The kit doesn’t include the box neither the Power Amplifier final Mosfet (RD16HHF1); the box is available from Artur SP3OSJ (http://www.sp3osj.pl) for 50.50 Euro shipping included in Europe. For the Power Amplifier MosFet, you can find them almost everywhere at a price ranging from 1.50 Euro to 25 Euro per piece. I bought mine from FunkAmateur in Germany (http://www.box73.de) for 6.70 Euro each, so 13,40 for the pair plus shipping.
I’ll post a review as soon as the kit is completed.
Feb 14 2016
EDIT: Waste of time, I cancel the fundraising.
I posted on GoFundMe a support request for a money collection to buy a DMR Repeater to cover the Mons area.
The crowdfunding is something mysterious to me and I don’t have idea on how it will end up, if someone will really put money on such a project or not. I’ve advertised the initiative on Facebook and Twitter and got some feedback but no money (yet!). If you wish to contribute the link is: https://www.gofundme.com/dmr-mons
Feb 13 2016
Some weeks ago the Yaesu DR-1X repeater decided to give up on power.
Aurelio ON5AFB, Giorgio ON3II, Alex IW0GXY and myself started to troubleshoot the issue to discover that Yaesu sucks. Please read twice: YAESU SUCKS!
Yeasu engineers decided to build a repeater by using a pair of downgraded version of FTM-400 radios and a aluminum radiator stuck on the transmitter with a silicon gen. These radios are build for a duty-cycle of 1-15 not for a heavy-duty cycle therefore the poor 1/32w resistors controlling the MosFet had become charcoal…
Thanks to Max IW0GXY, we managed to install a front-end to the transmitter and thank to the patience of Aurelio ON5AFB, the resistors were replaced with a more powerful one. Aurelio did something better, re-built the cover of the transmitter to have an additional fan directly on top of it. The fan is configured in extraction mode so the air flows from inside to outside reducing the collection of dust.
Feb 08 2016
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.
There is another offer, a chinese Tytera, KYD, MYT, BelFone, you-name-it products which are not available on the B2C market but only on Alibaba and again no warranty on any aspect and I mean: compatibility, quality, reliability, etc.
Feb 04 2016
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.
Jan 22 2016
I decided to return the vanity call OT1P which was assigned to me some years ago. I’m not really active and not doing contest anymore therefore it was just a real vanity issue.
It won’t be available for the next 5 years, perhaps by then I will change my mind and ask for it again.
I will honor my QSL up to the 31st of December 2015.
Jan 08 2016
ON0MNS – 145.7125 MHz C4FM/Analog Fusion Repeater is not working as expected.
We are aware of the issue, please DO NOT USE THE REPEATER as we don’t know if it is an antenna or a repeater problem.
We are working to solve the issue, sorry for any inconvenience it could cause.
Jan 06 2016
Please be informed that we are scheduling a maintenance to the DSTAR and C4FM Repeaters.
The following improvement might be implemented:
- VHF Repeater ON0MNS:
- Repeater DR-1XE Firmware upgrade to version 1.00m/DSP 4.11
- HMI-200 Firmware update to version 1.10d
- Experiment of Digital and Analog cross-modes (D-to-D / D-to-A / A-to-D / A-to-A)
- Wires-X software upgrade
- Server/Rack cleanup
- UHF Repeater ON0MON:
- Review of the CCS7 implementation
- Software upgrade
- OLed Display replacement
- Cabling and clean-up.
The date will be decided at the next technical meeting of the SysOps and announced via this blog.