April 30, 2015

The Russian Navy gave me an idea, and it uses morse code.

I'm not sure this is going to make any sense without some background information, so let me put things into perspective and maybe it'll be more obvious to you where I'm coming from.

The Russian Navy has a military presence all over the world, working with their allies, in joint operations, exercises, underwater research missions, etc. Several of these missions are not combat missions, and aren't covert at all. Russian Navy ships include oilers, research vessels and tugs; feeding, doing underwater research, and towing their armed military vessels around. As the Russian Navy auxiliary chugs along, they use Morse code (YES!) every six hours to report back to Mother Russia (Россия-Матушка) their location, sometimes the water's salinity, the weather, and other interesting information. These transmissions are mostly unencrypted and can be listened in on by anyone with an HF radio who's tuned to the right frequency. Following these transmissions you can plot exactly where an auxiliary vessel is going, or has gone, unless they go silent during a rendezvous with a SIGINT vessel off the East coast of the USA, hypothetically...

Andrew Roos did a fantastic trip up to Labrador by car, and had the ingenuity to make his own GPS map app beforehand. I really like the project, and hope to have his app (Birdseye) installed before setting out to Goose Bay this fall. There is one thing it doesn't do tho, and I think it's something I should look into... interface with a transceiver.

I have a SPOT Satellite tracker, for my own safety as well as my family's piece of mind, but it also costs ~$170.00CDN every year. I guess safety and piece of mind is worth it, but I find it annoying at the same time. Satellite communication is available all the time, but it shouldn't be the only recourse when you are out of cellular range. Shouldn't there be another way beacon where you are? Especially if you're mobile and have an unlimited 12V power source (ie, the alternator of your vehicle?)

How about transmitting your position to everyone in radio range, over HF (or VHF?), at high power, hourly, using morse code, at a slow 40 CPM? This is modelled after the Russian Navy beaconing every six hours, or the SPOT tracker beaconing every 15 minutes. The message would broadcast vector, speed, height and coordinates, maybe even loop a few times, and use a minimalist format.

(PS, this morse recording was received by Tom, in the UK, while the Nikolay Chiker was about 7,000 km away)

An explanation of the Russian Navy morse format can be found here:

But WHY do you want to do this Stef?

For the same reason you'd have a SPOT tracker; to let your people know you're on the move, or stationary, as you travel. If you fall off the face of the earth, there would also be a documented route you had been taking, and people could retrace your steps. This sort of system would work pretty much anywhere because of the reach of HF (or VHF) signals. If you had a base station set up to receive these beaconed morse messages back home, you might be able to record and publish your progress on a blog or other dynamic social media facility.

Looking at how a GPS outputs NMEA data, it's probably easiest to embed the RMC output in morse and just send it along. The message contains the time, date, location, speed and track vector; that's everything I want to send in one neat and tidy package, except I'd rather it use typical Canadian units of road transit measure (Km/h, decimal coordinates, etc)

RMC - NMEA has its own version of essential gps pvt (position, velocity, time) data. It is called RMC, The Recommended Minimum, which will look similar to:


     RMC          Recommended Minimum sentence C
     123519       Fix taken at 12:35:19 UTC
     A            Status A=active or V=Void.
     4807.038,N   Latitude 48 deg 07.038' N
     01131.000,E  Longitude 11 deg 31.000' E
     022.4        Speed over the ground in knots
     084.4        Track angle in degrees True
     230394       Date - 23rd of March 1994
     003.1,W      Magnetic Variation

     *6A          The checksum data, always begins with *
     ( more: http://www.gpsinformation.org/dale/nmea.htm )

AIS Transponders work similarly, broadcasting positional data, vessel information, and destination data over "Marine" VHF frequencies; 161.975Mhz (87B) and 162.025Mhz (88B), but they only broadcast with 1W, 2W and 12.5W of power, having a maximum expected range of ~40km at sea.

Amp up the same idea using morse over 10M Ham bands (28.000-29.690Mhz) or 2M Ham bands (144-147Mhz), and I expect it would go much farther.

Bob Bruninga already came up with APRS, Automatic Position Reporting System, and it covers some of what I'd like to do, but relies on repeaters to bounce the traffic around to an internet gateway. It reminds me of Link 16 or some other military tactical radio network. Rather than using a network of peer transponders, I'd like to have more of a point-to-point or hub and spoke, along with the disadvantages that come with it, like spotty reception over long distances. Essentially, I want to mimic what the Russian Navy is doing in the ~8Mhz and ~12Mhz range. The Russians are broadcasting direct, without the use of repeaters, and without the vulnerability that comes with that crutch - after all, if your repeater fails, you can't communicate anymore. Conversely, if you're in a valley, you might not be able to get your signal out to the intended recipient either - that's the advantage of a repeater on top of a hill near that valley...

Stretching this one out to my own practical example, I hope to drive from Carp, Ontario to Goose Bay, Labrador this fall. Carp to Goose, as the crow flies, is ~1425km.

Can I put together a system, that I can use, to transmit automatic computer generated morse, from a mobile rig, at regular intervals, with a reasonably sized mobile antenna, and be received at a high point in Carp, at least a few times a day, along the whole journey? I'm going to need to discuss with some HAM enthusiasts.  This may be a project bigger than I'm able to tackle this year.

April 26, 2015

Outfitting the vehicle with a CB and preparing the 2M

Since getting rid of my old 1999 Dodge Ram Sport, I haven't re-installed my CB in my "new" ride; today that changed.  I finally installed the CB in my Suburban, but I put it up in the headliner, where I never throught I'd ever put a CB.  I'd assumed it was too hard to get power up there - but luckily I had a universal car door remote that I never used - which has now been replaced by a CB!  The headliner console thingy where you could keep your sunglasses has been permanently trashed in order to make room for the CB, but that's OK by me.

The CB is a Galaxy DX-959, putting out 3.8W AM / 12W USB/LSB.  With a draw of less than 4A at full TX power, I'm pretty sure the original wiring up there will be able to handle it - even though it was quite a bit thinner than the 14ga. I ran from it to the radio.  The circuit up there has constant power; so I have to make sure to turn it off; but I like being able to use it without the keys in the ignition.

I also picked up a 2M Band HAM radio a while back that I haven't mounted yet, but I did get the power running to it from the fuse block today.  The rig is a Kenwood TR-7400a, a ~1977-vintage 144-147.995 MHz (VHF) FM transceiver, that puts out ~25W High / ~5W Low. It pulls a maximum of 1A on RX and 4.5-8A for TX, so I'm going to need to make sure I power it from an apprpriate source and with a fused link. The idea behind getting it was to have something other than the CB that might be able to reach help if needed with a higher power transmitter.

Now that I think about it some more, I'd like a similarly old fashioned 10M mobile HAM setup in the vehicle at the same time for essentually the same purpose - Comms from remote areas, but haven't found a cheap old mobile one yet.

Useful Links:

Galaxy DX-959 Owner Manual
Galaxy DX-959 Service Manual
Galaxy DX-959 on eBay.com
Kenwood TR-7400a Operating Manual
Kenwood TR-7400a Service Manual
Kenwood TR-7400a on eBay

So you're going to Halifax Nova Scotia?

So you're going to Halifax, NS and want to know what Cold War stuff there is to see?

Well, you've asked the right guy.

(I was going to make this into an email; but thought a wider audience might be interested.)

The Royal Canadian Navy has two comms sites nearby; Mill Cove and Newport Corner.  I'm pretty sure they're operational and remotely operated by HMCS Trinity in Halifax, so try not to get arrested.

The remains of CFS Beaverbank (part of the Pinetree Line) are likely accessible, and while a lot of it is already gone, you'll still see the view!  It may be private property...

CFB Halifax has lots to see; like CFAD Bedford; also operational, and it's an ammunition depot.. so.. try not to get arrested there either.

Have a great trip!