SDARC Worked All Counties

A massive thanks to all those who today helped with my Worked All Counties award from Swindon and District Amateur Radio Club. G4GMA, G3VCG, G4FTL, 2W0RDD, 2E0GGI, M5AFG, M6RMY, G0BRP, 2E0VBE, G6NHY, G0ELJ, M0HRT, G4BKE, G4KFB, M7GKO, G6LJF, M0TWS, GM4NNC, sdarc-logo-header2G3VOT, G4ING, M3DAF, M0KVP, 2E0DPG, M6DIT/QRP, M6TMF, G6ZRV, G7MIM, G0EVY, G3MRT, M0AJJ, G3JZC, M0JMO, M3HJH, G4GRJ, M6EBC, 2E0JYN, G0JSJ, G4EKM, G1MZD, EI8HL, 2E0REE, 2E0OAI, M0ZGY, G4RBH, G1LOV, M0RBK, G7AHV/MM, 2E0MEX, G8BWR, M3XNK, M0PRF, G0HRT, 2E0FUR, G7WIR, M6EVU, M0HYT, MW0UPH/M and later (not counting towards WaC but still very much appreciated) F4HHF, DK4DE, DK2TS and DK8DX.  Many thanks to all – I had a fantastic afternoon; 50+ QSOs of which 31(?) were unique squares counting towards the award.

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Best Android Morse (CW) Apps

10887103_10155191965610173_1007080408209715895_oI’ve spent the last few years periodically trying to learn CW.

The last few months I’ve found a renewed interest and enthusiasm for CW.  Determined to finally master the skill, I’m using Android tutors to practice where and when I can.  Being surgically attached to my phone means I always have the applications available;  for example a 10 minute wait at the station suddenly turns into a productive 10 minute practice session.

I’ve tried a number of Android CW ‘tutors’ and can recommend 3 which at least to me, stand out from the crowd. I tried many but have stuck with these, listed here in order of my discovery:-

1. Morse CT (More Code Trainer) by Todd Anderson

Morse-CT-0
MorseCT-2
MorseCT-1

 

 

 

 

 

 

The first app I spent serious time with. Both TX and RX are catered for.  RX is random characters in blocks (configurable) and TX is random letters, words or freepad (practice sending whatever you want!). The RX is particularly rewarding as the random characters mean you can’t guess words. However, whilst it’s definitely time well spent – the experience does feel a little dry compared to the next two options.

2. Morse App by Alexander Bratusenko

MorseApp-1
MorseApp-2
MorseApp-3

 

 

 

 

 

 

This turns CW into more of a game complete with rewards/achievements. A number of alternative approaches / challenges are available for both TX and RX; timed challenges, sending using a ‘key’, sending by selecting combinations of dots and dashes, receiving words and receiving ‘free txt’ (import a text file). The whole experience is quite entertaining and rewarding.

3. Morse Machine by Andrea Salvatore IU4APC

MorseMachine

I saw this mentioned on another website/blog and liked the sound of it. In some ways it’s a step backwards; by default it starts teaching random characters (K and M) using the Koch method. However, it’s fantastic fun and incredibly addictive. The algorithm progresses at a speed suited to the user; accuracy is tracked and characters introduced as/when required. Characters with high error rates increase in frequency, allowing the student to concentrate on weaknesses. It’s RX only, but really fantastic fun. I can’t recommend this highly enough.

However, I do continue to use all three apps regularly as the TX/RX style are all different (tone, spacing, weighting etc). I’m now making some real progress – in fact so much so, I had my first (albeit brief!) CW QSO on-air a couple of weeks ago. We exchanged callsigns, names, signal reports and 73s. Still, it’s a huge step forward and I have the above three apps to thank!

Also, worthy of a mention is K6DBG’s streaming news feeds.  These are current news broadcast converted to CW; to listen you simply need a phone that supports streaming audio (ie, most).  In my case the standard Android player failed but installing VLC (Android market place) fixed my problems.  I sometimes listen to this whilst in the shower or getting ready – I can pick out words/sentences even if I can’t yet follow entire news stories.

If you have any other recommendations please leave a comment 🙂

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SSTV from the ISS

I spent much of this weekend struggling with CAT control of the FT847 in SAT mode.  This will likely be the topic of a blog post at a later date!  However, the image here shows my Ubuntu desktop running gpredict and (at least partly) controlling the FT847 via rigctld. Click to enlarge.

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iss-image-201502010021-M0SPN

 

 

 

 

 

The results can be seen above.  Recorded using the FT847, a colinear (no beams), gpredict (CAT control) and QSSTV (Linux).  RX frequency was adjusted for Doppler but this isn’t essential (the shift is within FM limits). I’ve also included an mp3 file of the recording made (for use with QSSTV[Linux] or MMSSTV [Windows]): iss-31.01.15-23.57-M0SPN

The sync error was was unfortunate but appeared to occur at source as many others suffered an identical glitch.

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SOS Radio Week

38rnlicert15ALL-M0SPN

SOS Award

The last week saw 20+ stations take to the air as part of SOS Radio Week, raising awareness of the RNLI whilst also (hopefully!) raising some funds.

Many thanks to all stations who took part.  I worked 15 of the possible stations; enough to claim both a Platinum SOS award plus the certificate show here – the ‘Worked all Cumbrian Lifeboats’ award.

Donations can be made by text: SOSW99 £2 / £5 / £10 to 70070 (eg. SOSW99 £5).

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Swan 1200X and KW1000

KW1000_1200X

Swan 1200X and KW1000

After spending the xmas holiday converting my noisy poor performing end fed random wire to a resonant 40/30m fan dipole I decided 2015 would finally be the year I invest in a linear amplifier. This would be primarily for home use but also an essential part of field day / special event stations.

My investigation into solid state linears got no further than the price tag. The only amplifiers I could find that matched my budget were either used valve amplifiers or at a stretch, a new Ameritron 811. Whilst happy to wait a few months for a new 811 I did of course also keep an eye on ebay and other ham radio sites.

Sadly, these two amplifiers needed a new home due to a SK sale. They appear to have been very well looked after and recently serviced. The electrolytics look like they’re been recently replaced plus the seller informed me they’d both recently had new valves fitted.

I couldn’t find a massive amount of information online regarding these amplifiers so figured I’d add a few comments here.

Both appear good for 600+W output (measured into dummy load), possibly less in high duty modes. I understand the KW1000 uses 827Bs (common) whilst the Swan 1200X uses 6LQ6s (rare). The Swan does have modifications published for conversion to other tubes; I have yet to open my example to check exactly what’s fitted. Also worth noting, whilst the KW1000 has a fan fitted as standard, the Swan 1200X has had an aftermarket modification blowing cold air over the tubes.

Both amplifiers appear to have modifications made for keying from modern transceivers but not 100% what I expected. Rather than risk any weird voltage/current I built a DIY interface; 12V relay (at 100mA) keyed by my FT847, in turn keying whatever the linears provide. Update: Amplifier PTT Buffer Schematic

Reports so far seem positive. Both the Swan 1200X and KW1000 receiving great reports when running at full legal power.

KW1000

KW1000 at Night 🙂

The only other things worthy of note are: The Swan 1200X a) is 110V so requires a step down transformer and b) doesn’t present a standard 50 ohm load to the transceiver; the input impedance changes as the output is tuned. I’ve solved this using an ATU between transceiver and linear which whilst working is an added annoyance. The KW1000 doesn’t appear to have this problem.

Useful links:
KW1000 General Information and Modifications
KW1000 Manual in PDF Format
Swan 1200X Manual

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Comet CBL-1000 Review

I’ve previously made my baluns (4:1 and 1:1) and had great success for portable operation. However, I decided to go the commercial route for a permanent balun (1:1) installed on my new fan dipole installation at home. I figured a) it would at least equal anything I could DIY and b) it would be water & UV proof.

With the plan of adding a linear to run full legal power in 2015, I searched for a balun capable of 400W with ‘plenty in reserve’ to handle high duty modes. Plus, being rated higher I figured the losses would be less.

My search led me to the Comet CBL-1000 (1kW PEP). I think this cost somewhere in the region of £50; for this I was expecting a substantial toroidal ferrite with some large gauge wire windings.

The parcel arrived and seemed a little lightweight. However, the casing looked well built and a circular cavity existed which surely contained the toroid plus windings. Removing from the packaging I then discovered the majority of the weight *was* the packaging. Something was not right.

The adjacent image shows the contents.cbl-1000

Now, keep in mind the specs:-

1.7~30MHz
1kW (PEP)

Does this look like a 1kW balun?

Despite my reservations I put it into service. I figure at least I have a waterproof casing with space for a proper toroidal balun when I decide to upgrade. I don’t seem to be suffering from stray RF (a problem I previously had using an end fed random wire) although other radios nearby are still misbehaving when the HF radio TXs. I think this is more down to proximity than RF on the coax.

Reports on 40m seem positive; this is certainly a much more effective antenna than my previous non-resonant end fed random wire.

However, in summary, I question the peak power rating of the CBL-1000 and feel I’ve wasted £50. An old toroid, some heavy gauge copper wire and a waterproof enclosure from Maplins and I’ve had something properly QRO for probably 1/5 of the price. Still, we live and learn.

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Active from Sunspot Festival 17th/18th October

I’ll be working PSK, SSTV, DSSTV (HAMDRM) and possibly voice on 20/40m from Budleigh Salterton (South Devon) this coming weekend from Sunspot demoscene festival. The event features music, code and graphics from some very talented people, mostly created on retro computing platforms.
http://sunspot.sundowndemoparty.net/

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9600/1200 Baud Soundcard Interface with PTT

I’ve been happily using a RigBlaster NoMic and a PK-88 for data modes for the past decade. However, a recent interest in 9600 baud packet meant neither of these devices were suitable. The PK-88 is a fixed 1200 baud hardware TNC and the RigBlaster NoMic has an inadequate frequency response due to the isolation transformers.

For this reason most seem to interface radios directly to soundcards without isolation, then create an additional PTT solution. I like everything in the one neat box, so this is my solution (click to zoom):-

9600 Baud Soundcard Interface - Schematic

Correction: The PC Out schematic has an error – the resistor to ground should be 100 ohm, not 10K.

I decided to use a small relay for the PTT although an opto-isolator would have been an alternative solution (but the click is a nice audible confirmation of TX). Here the resistors divide the voltage from the RTS pin to a more suitable level for the transistor (I think I used a 2N2222) and the first diode scrubs off any negative voltage. Real RS232 ports swing +/-, forgetting this, I omitted this diode at first then wondered why two transistors quickly failed. Connecting to a scope quickly reminded me of my error! The final diode should probably be directly across the relay contacts – if building this, I’d suggest you move it.

The Radio (data out) ports are switched then DC blocked via a small capacitor to remove any DC bias. I’m hoping the small capacitor won’t effect frequency response too dramatically.

Built 9600 Soundcard Interface

The PC (soundcard out) is a basic voltage divider with again a small capacitor to scrub off any DC bias.

The adjacent photo shows the assembled device (click to zoom).

I added a power LED plus a TX LED connected to the secondary relay contacts. It seems to work well.

Update: Attenuation needed to be removed for 9600 baud. This doesn’t appear to effect 1200 baud (alsamixer provides enough control over audio levels).

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Configuring Soundmodem TNC in Ubuntu 14.04

Ubuntu 14.04 (and to some extent previous releases) makes the configuration of the soundmodem driver a little more troublesome as the /dev/dsp device is now obsolete.

Below are the steps I’ve just taken to install & run TCP/IP over ax.25 using the Soundmodem driver. Don’t worry, it looks quite complex but 90% is performed in a GUI; the instructions below are the verbose version 🙂

sudo aptitude install osspd (possibly not required)
sudo aptitude install soundmodem
sudo apt-get install ax25-apps ax25-utils ax25mail-utils ax25-tools ax25-xtools
sudo soundmodemconfig
File->New->Configuration
Choose a name (eg. 1200 baud)
Click on chosen config name
Mode: alsa
Audio Driver: Select soundcard channel (in my case plughw:0,0)
– Note: ‘aplay -l’ and ‘cat /proc/asound/device’ can help here
Half Duplex: Yes
Capture Channel: Mono
PTT Driver: None
File->New->Channel
Click Modulator tab
Mode: afsk
Bits/s: 1200
Frequency 0: 1200
Frequency 1: 2200img_0001
Click Demodulator tab
Mode: afsk
Bits/s: 1200
Frequency 0: 1200
Frequency 1: 2200
Click Packet IO tab
Mode: MKISS
Interface Name: ax0
Callsign: any
IP Address: choose IP
Diagnostics menu can then help with levels
File->Quit
sudo vi /etc/ax25/axports
insert line:
1 YOURCALL 19200 236 2 432.800 MHz (1200 bps)
Save and exit vi
Kill any services which broadcast unnecessarily (samba etc)
Kill auto-discovery daemon (sudo service avahi-daemon stop)
sudo soundmodem &
Check ax0 device, confirm IP config (ifconfig ax0)
Try sending an ICMP packet (ping an address on the ax0 network)

I’ve since discovered most of these steps are covered (with screenshots) at M1GEO’s wiki:- http://www.george-smart.co.uk/wiki/AX25_Soundmodem.

Useful commands:-

axlisten (dump all incoming packets to console)
axcall (connect to remote station using ax.25)

Enjoy!

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My First 70cm UKAC

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M0SPN/P, Barbury Castle, Wiltshire

I took part in the 432MHz UKAC last night (09/07/13), operating from Barbury Castle (Wiltshire, ~250m ASL) using an FT817 and 7 element ZL special.

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