Tag: uhf

Hytera MD785G review and first impressions.

After my last article on the TYT MD380 I decided it would be nice to get a DMR radio for the home / car use. I read quite a lot online and decided to select a radio that would support roaming. The Hytera MD785G fitted the bill, and is available in both a high and low power UHF or VHF version. I selected the UHF 45w version, and purchased the programming software and lead. The ability to load codeplugs is essential, as DMR is still very much a moving target, new repeaters are coming on all the time.

The Hytera MD785G is a tier II DMR radio, UHF 400 to 470 MHz, with a 1024 channel capacity. It can be programmed with up to 64 zones (16 channels in each zone)

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Size 174 x 60 x 200 mm at 1.7 kg with colour LCD display.

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RF power is adjustable depending on model  from 5 to 45w (high power version) or 5 – 25w (low power version). The 785G supports GPS although the amateur DMR networks does not support GPS location data at this time.

The radio has a BNC connector on the rear for your aerial, and SMA for GPS. The resolved audio is loud, crisp and clear and the radio looks and feels solidly built.

 

 

I couldn’t find any good quality pictures of the top, front and rear online so I took some myself. Here you can see the BNC connector for your aerial, heatsink, power lead (detachable) and SMA for the active GPS antenna.

 

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UPDATE Jan 2016

The structure of the DMR network has changed substantially since I first wrote this article, and many of the codeplugs have become outdated. New codeplugs that reflect the FEB 16 structure can be found at GB7JG and GB7CL website.

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At the time of writing some previous sites have outdated codeplugs (although links retained as they may be updated) Codeplugs online are often outdated G0HWC site.  Other codeplugs are available from codeplugcentral and  GB7DD.

Hytera MD785 CPS software is available at GB7DD

You can monitor live UK traffic for DMR online, and clicking on a callsign / repeater  will filter activity just for that call / repeater.

A list of all the UK DMR repeaters is available on the UK repeaters website.

Ham radio now filmed W2XAB John giving a great talk available to watch below on DMR. He also produced a guide to DMR in PDF free to download.

 

DMR radio TYT MD-380 First impressions.

After reading a review on the @essexham website I decided to take a look at the world of DMR and the MD-380 seemed like a good place to start. The radio is available on eBay for around £100 including programming lead, software and delivery! If you want to purchase from the UK, with support then I would suggest you look towards Taylor Made RF for around £149.

So the basics, the radio is 1w or 5w, 280g weight and is supplied with a 2,000mA battery. You can program the radio with up to 1,000 channels and will operate between 400 and 480 MHz. VHF versions are available, but most DMR repeaters are UHF at this time.

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If you decide to go down the self-service route you will need to register your callsign and obtain a “unique” number. This number will need to be programmed in once you receive your radio, so the addition of a USB programming cable is very helpful.

Once you receive your DMR radio its likely to be unprogrammed and you will need to source a codeplug. These are available from various websites, and due to the number of repeaters coming online they can quickly go out of date.

UPDATE Jan 2016

The structure of the DMR network has changed substantially since I first wrote this article, and many of the codeplugs have become outdated. New codeplugs that reflect the new structure can be found at Charlie M0PZT ham goodies website and GB7CL website.

GB7DD website also contains a great deal of information on DMR including codeplugs.

You may also want to download the programming software and then review the latest firmware versions available for your radio.

You will also need to have a basic understanding of “talk groups” and you will find some information on the protocol to follow.

New to Feb 2016 was the reworking of UK talkgroups. The structure has changed, and all radios will require reprogramming. The new structure is explained in this PDF available from GB7DD website

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Its not possible to have all of these active at the same time, and the diagram here explains why. DMR uses two timeslots, so thats one frequency time divided into 2 and you can use 1/2 of that repeaters capacity by using one of the talkgroups.

Activity and repeaters

You can review who is on DMR and the activity levels in near real time and see the signal level and BER that you accessed the repeater. A complete list of DMR repeaters and associated coverage maps can be seen on the UK repeaters website.

First impressions

Excellent value for money, solid construction and easy to read display. Audio reports are good, speaker volume and resolved audio quality are very good. The programing software and USB cable are essential, I had no issues with running these under Windows 10.

Hope to work you on DMR soon 73 Dave M0TAZ