Thursday, August 25, 2016

MB6ISR - The SW London Fusion Gateway



I recently purchased an FTM-100DE so I could have a play with Wires-x and fusion


It’s been interesting to set things up and experiment with this mode.


One thing that drew me towards it was that unlike D-Star there was no need to register, just enter your callsign and if you wish a name into the rig when you power up for the first time and away you go... (More on this later)


I soon established that there was absolutely no Fusion activity on 2M and a very distant repeater (GB7HF) on UHF.


I use a now out of Production Araki YA485D vertical antenna that has very good performance and I live in a reasonably flat location. Placing my UHF antenna above the roof ensures it has a good range. Its a 2 x five eighths vertical and I remember back in the 80's using it to access BG3PT which was a RTTY repeater in Cambridge (Much to the suprise of the locals)





At 11M above ground level I was able to access GB7HF at Welham Green about 40 Miles north and started to learn how C4FM and Wires-x works. Trouble is the path wasn’t 100%. I also discovered that on 2M the FTM-100 suffered atrocious intermod from a local paging system, even with a PAR pager notch and bandpass filter I had problems so decided not to use the FTM-100 on 2M


My next purchase was a second hand HRI-200 which is an internet Gateway. That’s where the need to register arrives as Yaesu needed my details before allowing me access to the Wires-x network through the device.


A day later I was duly granted the appropriate access and just had to set up the HRI-200. This wasn’t that straightforward given the internet connection at my QTH. I played with lots of settings around fixed IP addresses but these were a red herring.. Eventually I worked out I had to enable port forwarding against a range of addresses for the HRI-200 to connect.


So here’s the rub. In the UK you cannot lawfully re-broadcast internet traffic without obtaining a NOV (Notification of Variation) from Ofcom.


I started by running the FTM-100 into a dummy load and using a second FTM-100 to connect to the Wires-x network. Thats was actually quite useful as I slowly learnt how the system worked by connecting to a node then searching and selecting the rooms where I could work people in or just monitor.


After a little more researching I realised I could apply for an Ofcom NOV which would allow me to re-transmit the Wires-x traffic.


Application for an NOV is through the RSGB ETCC for the region. Dave G7UZN is the rep for the SE Region, He pointed me towards the online application form and some things to observe (Power, antenna etc). I completed and submitted the online form quite easily although you have to be careful to get the location and height above sea level correct.


There were a few issues to consider

  1. I could run on 2M unattended but the FTM-100 would suffer intermod causing drop-outs and in addition it would tie up 2M which I use for local chat and SSB DXing
  2. I could run 70CM but it required attended operation (Why?) so I couldn’t use it out and about mobile


I decided to apply for a 70CM NOV as it was the lesser of two evils. I built a small swich box so I could leave the Gateway running 24/7 and switch the rf to a local load when unattended,


I left allocation of the specific frequency to Dave and waited for a response. I was surprised how quickly I received my NOV and by the second day I had the power on the FTM-100 reduced to one watt (another condition) and the gateway running on 434.5125Mhz


I’m home most days from 4pm so if you live around SW London and own a set capable of C4FM, hit the DX button on your transceiver and see if my gateway responds.

Here is a MB6IFR now installed in a corner of the shack -



The MB6ISR equipment is

  • Lenovo ThinkCentre M91p SFF Quad Core i5-2400 8GB RAM 250GB  SSD Windows 10 Professional 64Bit Desktop PC running Wires-X
  • Devolo powerline adaptor delivering 100MB/s ethernet (and no, it doesn't interfere with my HF!)
  • Yaesu HRI-200
  • Yaesu FTM-100DE
  • Hombrew switch unit and load 
  • Bird Truline with RF-port for frequency measurement
  • 8M LMR-400 feeder
  • Araki 458D Vertical
  • TTI Instruments frequency counter (10Mhz GPSDO locked)
I haven't set up a room for SW London as there are already lots to choose from and the gateway is open to all users who can select what they want to listen to. I must say I enjoy listening to America Link and UK Net Hub traffic.

I will see how things go and maybe set up a 2M Gateway in the future. 

VY 73 Rex G8UBJ



Sunday, August 18, 2013

MY 2M Station

I thought I would post my 2M station details.

I have owned the FT-225RD for a number of years. Its been quite modified but nothing that can't be reversed. These include

  • Mutek front end
  • Separate RX port 
  • External Amphenol relay for RX/TX switching
  • The microphone includes a home brew compressor to  improve performance slightly
  • Mods to quieten sideband noise of the VCO
  • External PTT sequencing to protect the relay contacts from the...
  • Tokyo Hy-power HL350Vdx which is a courtesy addition for those hard to reach DL and HB stations
The IC-202S is a recent nostalgic purchase. This was the first transceiver I owned back in the 70s and I remember the fun working GW for the first time HI HI. It had some "Issues" but their mainly sorted now. 

Tune up yielded 5 Watts once I adjusted the 2M band pass filter correctly (Bypassed on RX). The ALC works well throttling it back to 3 watts but I did notice some overshoot...

I plan to fit rechargeable batteries and take it portable. See you on 2m SSB? 



Friday, December 28, 2012

Round up 'em doggies

Happy 2013 to all, lets hope its a good one. 

I achieved a good end to 2012 by coming first place in the 2012 ARRL RTTY Roundup




Of course there weren't that many entrants for England but I was top. It looks like running up a good number of multipliers (running all bands and chasing continents/countries) paid off. Congratulations also to Mike K4GMH winning the single op category for NA, hes always a big signal and I often work him on all bands. The 2013 ARRL RTTY Roundup is next weekend so I will see if I can up my 2012 score and secure another win.

I built a reasonably good VHF station this year. FT-225RD + Mutek front end driving a Tokyo High Power VHF amp to 300 watts +

My 2M array seems to have gone faulty (I think it may be the splitter) so as soon as the high winds die down I'm going to make repairs. 





The 2 x 4 ele Cushcraft boomers work well but I think I will replace them with a single long yagi.  Probably another Boomer as they work so well.

I'm up to 159 countries confirmed on HF RTTY through LOTW so I hope the double century isn't too far off. Maybe 2013 will be the year?

Anyway, I may have a busy year at work but I'm sure I will see you all on HF RTTY over the weekends?





Wednesday, April 18, 2012

A word on fraud

It would appear someone is using my name and call G3VZL to advertise equipment and then defrauding purchasers. I'm not the first this has happened to or the last.

If you ever see an advertisement with my call only those with my email G8UBJ.IO91UJ(at) GMAIL.COM is a valid advertisement. BTW I very rarely advertise and if I do I invite viewing/testing at my QTH!

Unfortunately this sort of thing will happen and so long as people are stupid enough to -
1 Set up a website without sufficient security checking at registration

If you see an advertisement for Ham radio equipment check the seller is valid through another site like QRZ.COM and LOTW

Do not send money, please report this to the authorities.

VY 73 Rex G8UBJ

Saturday, January 21, 2012

The FT-1907R UHF Mobile

I  recently started looking for a UHF transceiver for the shack. I know its easy enough to buy something like the FT-8900 but I have separate antennas for each band & I really wanted something I could leave running. 
 

I thought Alinco were about the only company left selling single band UHF transceivers until I discovered the FT-1907R.
 As you can see its a companion to the FT-1900 2M transceiver from Yaesu.

I found a Greek company selling this on eBay which surprised me as its not listed on the Yaesu dot com site. Either way it was quite a reasonable price and delivery was quick.

Initial testing showed that it did provide 55 watts output as specified and on the air was reasonably sensitive. I'm sure that if this gets to the states we can rely on the ARRL to put it through its paces so I won't go further into testing as my facilities are limited.


Transmit and receive runs from 400 - 470 Mhz continuous.

At the heart of the The PA stage is Mitsubishi RF Mosfet module capable of 60 watts

 http://pdf1.alldatasheet.com/datasheet-pdf/view/169066/MITSUBISHI/RA60H4047M1.html

I found that like the FT-1900 this gets quite warm during extended transmit so I will publish a fan modification in my next post.

 As its a UHF rig an N-type connector would have been a nice addition. This was quickly fixed.

The rig comes with the usual Yaesu accessories (Even the sticky Yaesu label). I found the user guide listed on the Yaesu Russian site but strangely its only mention is on a brochure where it says Asian market only


I'm not sure why its not more widely available; maybe its early days or maybe Yaesu are trying to protect sales of their multi band transceivers in Europe and North America?

Friday, December 30, 2011

Look Mum no Hands, or - FSK without using an RS-232 port


In a recent QST (August 2011) I spotted an article showing a way to implement FSK keying using only the audio output from your PC.
The article was written by Doug Hall K4DSP who can take full credit for this brilliant design!

You can find more information on this project at - http://k4dsp.homeip.net/~doug/regenerator/


That may sound easy but up to now the only solutions that provides true FSK without using an RS232 port have required conversion from the USB port which is quite complex in order to achieve a stable 45.45 baud rate.

The FSKit from Doug converts transmit AFSK tones from your PC into FSK keying and also PTT. In addition it provides isolation between the PC and transceiver.

I wanted to build a portable station for field use using my IC-706 and a lap top PC (No RS232 ports) and I didn't want to use AFSK as -

1 - You have to keep an eye on the drive levels to ensure a clean signal
2 - The displayed frequency is incorrect 
3 - You need a work around to use the narrow RTTY filter.

The article from Doug was easy to follow; at the heart of the project was an AMTEL AVR micro-controller (ATTiny 45). The binary is available online but in reality it was easier to email Doug and purchase the micro-controller and at the same time a PCB...




The circuit was fairly easy to assemble although obtaining the op-amp and transistors required a little searching around.

I decided to house the FSKit in a Maplin enclosure and add a few bells and whistles..

1 - Powered from the IC-706 8v line
2 - Incorporate CI-V control for logging and spotting
3 - Some indicator lamps (Power - PTT - FSK - CI-V)
4 - Audio out gain control for transmit of PSK and other modes
5 - Audio in gain control  and isolation
6 - Audio transmit side tone  

I tried using an L78L05 to run the board but it was a little fussy a 3.3 volt regulator worked perfectly. The board uses very low current so the low power version is best.
 
I have a simple CI-V and tried an isolation circuit for this, unfortunately I couldn't get this to fly so just routed the CI-V through the terminal unit with some in-line ferrites to provide a little protection. 

All the indicators were LEDs - 
  • Power just needed a 1K resistor in series
  • PTT and FSK lines run to LEDs with a 2k and 1k resistor in series to the 3.3v line
  • CIV was a high brightness LED across the CI-V line with a 2k resistor in series (Flashes to showing active data present).
Doug provides an isolated audio output on his board. I fed this to a potentiometer and then on to the rig.

Audio receive was from the rig to another potentiometer and then an isolating transformer to the PC audio input - I use N1MM with MMTTY RTTY which uses audio in so just needed some isolation.
Last was a simple moving coil microphone insert that was across the audio input line. This is useful to check the tones sound okay on transmit and gives the operator confidence that something is happening (I find complete silence on transmit a little disconcerting.
As you can see the whole project went into an aluminum enclosure. I could have squeezed it into something smaller but the box I used made for an easy life.

The cable from the rig to the terminal terminates in a 9way D-type so I can make up other cables for other rigs in future. I used an old VGA cable as it has ferrites pre-installed and several screened conductors which are useful to keep the audio lines quiet.

I haven't labeled the terminal unit yet but that's the only thing left to do.

Its not a microHam interface but its inexpensive & does the job for /P operation.

I think this probably the best and least expensive way of implementing true FSK. I have made a few contacts from home but I'm looking forward to summer when I can try it portable.

Friday, September 23, 2011

I do desire we may be better strangers.

Or - "It was hard to code so it should be hard to use" 

Who would have thought eBay could implement a feaure thats so poorly thought through that I gave up on them. 

Their new "Shopping Basket" function has to be the worst thing. Worst still buyers can't opt out or remove it.

I'm sure some green horn functional analyst specd it out but I don't think the Product Owner tested it.

If you use the Bay be very careful with this feature (Totally avoid it if possible!) as it lacks controls to remove items and auto comitts you to purchases you don't want.

This sort of thing isn't rocket science, just pop over to Amazon and you can see how it should be done. Then again I don't suppose Amazon have the highest NPS scores by being careless.

Adios ebay - I do desire we may be better strangers.

P.S. Employing professional analysts with a web background may help you solve this problem.