Friday 28 August 2020

 Here is a look at the Handheld radio I use the most. Its a FM/DMR dual band handheld and its available if you shop around for under £50.00. Quite well made too and the RX performance is pretty good and I get good reports on TX too. Goes to show that getting into radio and DMR needn't be expensive.

Friday 24 May 2019

160 metres

160 metres isn't really a band I have ever done much operation on. When I was first licensed I suppose I had the space for a decent 160m antenna but wasn't really interested in that band. These days space and local noise are the main problems. Having recently rediscovered WSPR I thought I would try 160 again.
Whilst my Drake MN4C tuner will tune my G5RV antenna OK, an evening on WSPR showed that the antenna was pretty useless on that band with nothing heard and nobody hearing me. In any case reception was all but impossible with S9+ of noise on the WSPR frequency.

Plan B was to insert a ground rod outside the shack (easy enough as my shack is on the ground floor) and strap the two sides of the G5RV together and tuning it against ground. The noise I experience on 160 at the moment is pretty bad, S9+ so receive is difficult. I did however manage to get my 10w WSPR signal out as can be seen below

Additionally I managed to receive two German stations and one Swiss. I will experiment again with WSPR on 160, tonight I closed down just as darkness was closing in, a later session may enable some more distant reports. I would be happier running a maximum of 5 watts on this mode so will reduce power in future.

So it seems it was worth hammering in that ground if only I could trace the source of the noise.

Wednesday 22 May 2019

6 Metres

When I first moved to this location, just over three years ago one of the first antennas I put up was a tri band 6/2/70cms vertical. I found it to be rather noisy on 6 metres and since I could only hear one 6 metre FM repeater, very noisily and there wasn't much else going on 50 mhz I took it down.
I replaced it with a dualband X30 vertical which being smaller I managed to get up higher in the air. The X30 works very well, as well as an antenna can work in this very poor VHF/UHF location in the bottom of a valley.
A couple of weeks back, when there was a sporadic E opening on 10 I found myself wondering whether 6 metres would be open too. I renmebered that I had a 6 metre dipole lying in my shed, one had had successfully used loft mounted in a previous location.

Today I dug it out, connected it to some spare RG8X cable I had and put it up outside. Its less than 5metres up at the moment but should work OK if the band opens.

Since my main HF rig, the FT10000MP doesn't cover 6 I have put the Icom 7000 back on the operating desk for this band.

Lets hope I haven't missed all the SP E openings this year!!!

Radio on the cheap?

Despite the old saying "you get what you pay for" I have been pleasantly surprised with  the handheld pictured above. Its a Baofeng DM-860 dual band VHF/UHF FM and DMR handheld.

Form factor is almost identical to the more expensive Radiodditty GD-77, in fact the batteries and chargers are interchangable between the two radios.although the programming lead and CPS software is different.

I have had this radio for a couple of months now and it has become my daily use handie. I have had good audio reports from it on both DMR and FM. Probably the best radio I have seen from Baofeng to date. It's not perfect obviously, the receiver on FM is not as good as my Icom ID51 for example but real world tests (i.e. using the radio) show it to be superior to both the Baofeng UV5R and RD5R.

At a price (direct from China) of just over £40 though it is hard to beat, particularly as it allows a degree of programming from the front panel which is not something all DMR radios allow.

Wednesday 24 January 2018

really not real radio!

Just over two years ago I purchased an Icom ID-51 Dual Band handheld radio. What was unusual for me about this radio was that it had D Star Capability. This was a mode that had never interested me in the past after all it wasn’t real radio as it depended on repeaters and or internet links to work. However, at that time I was about to move house, had dismantled the shack and taken down my antennas so I thought it would give me some radio interest to occupy my time.
Two years on I still have the Dstar gear, have set up a personal D star private node so I can work within a few Kms distance from my shack when I am portable or mobile and using Dstar has also introduced me to the delights of the Raspberry PI mini computer which I use with my node.

I have also obtained a DMR handheld, DMR equipment generally is much cheaper than Dstar or the Yaesu digital mode Fusion. The problem with DMR as it of course is a commercial mode and was never really designed for the amateur market. Programming DMR rigs is a real nightmare (for me at least) but I am learning.

I am also lucky enough to know a very generous amateur in our local radio club that has loaned me a Yaesu Fusion Rig to try. So now I have all three of the digital modes to hand.

Three modes, three radios- Icom ID 51-Dstar, Radioddity GD-77 DMR and Yaesu FT1D Fusion.

One thing all of these modes have in common is that they rely heavily on the internet. Yes of course you could have simplex QSOs in any of the three -Dstar, DMR or Fusion but generally this is not how these modes are used. Most people are either working through a repeater or a personal node or hotspot all of which use the internet as its backbone.
The three modes are incompatible and at present there are no transceivers that operate more than one of these modes. So, if you want all three you need three rigs! This also has the effect of diluting activity, as some are on one mode, others on another.
Activity wise my Experience is DMR is marginally the most active, followed by Dstar and lastly Fusion.
Whilst as I have written before it is fun to have Crystal clear worldwide contacts from an armchair using a low power handheld it doesn’t have the same magic as working HF or even FM on VHF. These days VHF 2 metres is all but dead in this area, maybe these digital modes are to blame who knows? But using these digital modes tied into the internet I suppose is no more magic than a telephone call! That said I do use these modes from time to time.  Who can deny how useful these systems would be for someone who cannot put up antennas of any description but still wants to keep in touch with other amateurs? The problem I believe is that there are newly licenced amateurs who will never progress beyond their DMR handie and experience the fun of the HF bands simply because its so easy!

Drake R8B- an old friend revisited (almost)

Back around 15 years ago or so I bought a Drake R8A receiver. It was the first real top- flight receiver I had owned and I remember being very impressed with it. I even used it with some PC software which back then was quite a novelty being able to tune a radio using the PC. Eventually I sold this receiver, I can’t remember why now but it was probably to fund some new shack equipment. I regretted selling it soon enough but these receivers seem fairly rare in the UK so I never managed to pick up another.
Although I have held an amateur radio licence for over 30 years and am active on the bands from time to time I have always been an SWL at heart and always have a few dedicated receivers in the shack. In recent years I have had receivers which were top of the range in their day. I still have an Icom R70 and a Kenwood R5000 here, both still very good performers.
Just before Christmas however I spotted a Drake R8B on Ebay. It was advertised as having a fault. That fault was that on switch on the radio showed “PWRLOS” on the display. This is in fact not a fault, it simply means that the receiver had been unplugged from the mains supply, the internal clock has lost the time and needs resetting. If this was the only fault then there should be no problems.
I took a gamble and bid and won the receiver. It didn’t sell at a particularly cheap price but then again it sold for lower than I would expect, no doubt due to the advertised “Fault”.
Well the receiver duly arrived and on unboxing it I found I was lucky. Resetting the clock fixed things and I had an operating R8B. A quick wipe with a cloth and a little polish and the receiver seemed in good condition.

Well how does it compare to the other receivers I have? One thing I had forgotten from my old days of Drake ownership. It dwarfs the R5000 and is substantially bigger than the Icom R70.

 Build quality is not as good as either rig. It seems more flimsy than the R5000 and the R70 which is built like a tank! The Drake has a very light feeling VFO knob too!

This may sound like I am disappointed with this set, but actually I am not. The audio quality on the R8A once you plug in an external speaker is superb. It has a good range of IF filters 6,4,2.3,1.8 and 0.5khz, effective passband tuning and notch filter and synchronous AM detection.  It would be ideal for a Medium Wave Dxer as it has good sensitivity through the band. I also find the numeric keypad ideal for navigating the bands just by punching in a frequecncy.It is also controllable via a PC although getting suitable software for it these days will be a challenge.

Saturday 25 November 2017

Unusual Receiver

I picked up this receiver at a local radio rally a few weeks back.  It is an RX80. It was made from a kit Featured in the RSGB magazine "Radcom" in 1981. It is amateur bands only but since it has a digital frequency readout I suppose it was quite advanced for its time. I have never seen one before and as you can see below this is a working example although the WARC bands (10 18 and 24 mhz )dont seem to function.