Posts Tagged ‘amateur radio’

A nice QRP surprise this morning

We’re getting ready to hit the road for vacation.  It’s been a whole year since KD2CHE and I tied the knot on a cliff overlooking Lake Tahoe.

Xiegu X1M

Xiegu X1M

We’re not going to be heading back there yet, but wandering through New York’s North Country a bit.  I’m expecting to get a little portable QRP operation in as we poke around up there.  In anticipation of the trip, I picked up a spare power supply from my brother a few weeks ago to use with the Xiegu X1M, and any other 12V items I have or may acquire when I’m not near my main setup.  I decided to assemble the “motel room” version of my QRP setup here to see how it works.  I have the Xiegu, my Emtech ZM2 tuner, mic, the spare PS, and a small amplified speaker sitting here on the couch.  A string of 2 alligator leads is running from the ZM2 to the feed-thru from my random wire up near the window.  Everything powered up, and tuned up, so I decided to answer a couple of calls on 15M.

 

I made USB contacts with UT7UJ in Kiev, and S51ZZ in Slovenia from my test station on the couch here in Long Island.  Not bad for 5 Watts.  This little rig is full of surprises.  I also just found out from Ed at Import Communications through a post to the Xiegu X1M Yahoo group that he is going to be offering upgrade kits for the earlier X1M to upgrade the front panel and display to the newer version, as well as a strong possibility of a firmware upgrade that will cure many of this rig’s little issues.  The firmware upgrade has already been released for the newer model.

 

Now, time to pack it back up, and hit the road.  73s de Neil, W2NDG

RadioKitGuide.com is being updated, and you can help!

Hi all,

The Lydford from Walford

The Lydford from Walford

I am in the process of updating radiokitguide.com.  If you can think of any new kit sources that I haven’t covered yet, please leave a comment here.  I am looking for RECEIVER, TRANSMITTER, and TRANSCEIVER  kits.  I will cover accessories at a later date.  If you know of a spectacular source of accessory kits though, send it along anyway.  I am adding a couple of new sources, and making changes to YouKits, Small Wonder Labs (goodbye), TenTec, and several others.  Thanks in advance for your help!

Digital Voice (DV) – the new FM?

Once upon a time FM swept away AM, but DV is taking its time despite some clear advantages.

I’ve had yet another stunning 5W mobile QSO on 2m this morning on my way to work. Several miles of clear, unbroken chat, without mobile flutter. DV mode delivers good quality voice against a noiseless background. It is sometimes claimed that coverage is roughly extended by 20% due to advantages of this mode, even. I doubt this is entirely true, but an excellent quality of communication is doggedly maintained before ‘falling off’ very quickly. It is quite robust and packed with extras. Ideal for V/UHF and it’s been around for several years.

Even the 2m band-plan in the UK lists all the simplex channels as dual FM/DV. I must admit that I and my friends keep traffic to the UK DV calling frequency (144.6125 MHz) to ensure anyone equipped with DV will hear us and join. If the current FM population heard our carriers on normal working channels, they would be quick to complain about the noise the noise as QRM.

This is what DV sounds like on your FM radio:


DV mode is famous for being the common mode that binds the larger DSTAR system (Digital Smart Technology for Amateur Radio), but excels as a simplex mode too. No analogue mode will embed your callsign for display, report your GPS position, over a low speed data link – all during a normal voice QSO, rounded off with an inoffensive little beep at the end of the over. (Because there is absolutely no background noise, it’s difficult to detect when someone has released their PTT). This is why DV is such a superb candidate to network via DSTAR. This is where radio marries the internet and we are its children.

The new Icom IC-7100 even has people quirkily chatting away on 4m with DV mode, which I gather works very well.

So what is DV mode made from? Well, your voice is encoded digitally using a vocoder optimised for voice communications in the same way your mobile phone does. The device that does this is called the AMBE chip (Advance MultiBand Excitation). Some people moan that this is unfair being a proprietary device, not being open source technology. However an AMBE chip can be freely bought for just a few dollars and uses proven, reliable technology. Inmarsat have been using it for years.

The digitised voice at 3600bps combines with an additional 1200bps (which you can do anything you want with! Think file transfer, photos, messaging etc.) before being modulated. The 3600bps voice data also includes 1200bps FEC (Forward Error Correction), which sends a little extra data in case any gets lost over the air. When bits are lost, the receiver uses this extra data the plug in the gaps. The modulation scheme is GMSK (Gaussian Mode Shift Keying), which is basically a form of phase modulation. You’ll also appreciate that all new modes often save bandwidth as well as improving quality and a DV carrier will happily fit into 12.5kHz channelised plans.



So, what are we waiting for? The manufacturers! The market is caught up in adoption stalemate, with Icom having settled for DV whilst others shun compatibility. But there are also homebrew DV options out there, with modulator/codec boards that will plug into your FM radio (via the packet port or tap into the discriminator) turning your analogue radio into a dual-mode digital delight.
My home DSTAR hotspot. Comprising 2m PMR radio (underneath), GMSK modem (top) and Raspberry Pi computer (bottom).
There are other digital modes out there too, all with different strengths and weaknesses – and they are interesting. But for the sake of everyday commonality and general take-up, I think DV has it.

So is it time to catch up with modern telecommunications techniques and move away from analogue FM? Maybe there’s something in the more ‘tactile’ feel of FM: The waxing and waning, the background hiss, the heterodyne-ing. You seem to know exactly what’s happening and what’s about to happen. So many modes – enjoy the hobby!

QRP: More fun than a barrel of microphones

This is an article I wrote for LIMARC here on Long Island, and also posted at my blog Fofio!.  Some of it is targeted to beginners in the hobby, so I apologize for the elementary nature of some of it.  Many of the kit references can also be found at my list of radio-related kits RadioKitGuide.com

I have been slowly getting into QRP these days (low-power for you beginners).  Being an outdoorsy kind of guy, it mixes well with my outings.  What has really surprised me latelyIler 20 (or 40) kit from EA3GCY though, is how well you can do with some inexpensive equipment, and a simple antenna.

Most of my portable setup is relatively Read the rest of this entry »

Honoring Our Heroes

american_flag-821

I hope you’ll join me in focusing our attention, thoughts and prayers to our heroes who lost their lives 12 years ago and also to those who lost their lives 12 months ago today.  In addition, we should also honor all who have given their lives to defend freedom around the world.   We must never forget those who died on September 11th and we must never forget that freedom is not free. 

May God continue to bless this great nation…and may freedom ring around the world.

JT 

Colorado QSO Party – 2013

co_flag

The 2013 edition of the Colorado QSO party is complete and in the books.  Perhaps, with exception to Field Day…the COQP is my favorite on-air radio sport opportunity.  I truly enjoy representing the Centennial State and Denver County in this annual event.

The event is a full 16 hours from 1200 UTC (6 AM local) to 0400 UTC (10 PM local).  In past years I’ve honestly not bothered with setting an alarm in order to get up with the chickens and get on the air.  However, this year…well, my wife and I had just arrived back in the US from two weeks in Europe less than 36 hours before the start of the contest.  Needless to say, I was still on London time and I was awake at 4 AM. 

With coffee in hand, I switched on the computer and radio (my trusty Yaesu FT-950) and began spinning the dial promptly at 6 AM.  Band conditions at this time of the day and in Colorado just weren’t compatible with my contesting efforts.   Having been up due to jet lag for a few hours, I decided a nice morning walk was in order.  After all, I still needed to get in my 10,000 steps.  It was a beautiful morning in the mile high city and I used the time to walk along the DTC and admire the beautiful rocky mountains. 

Energized after the walk, shower and breakfast.  With even more coffee I headed back down to the basement ham shack and resumed my efforts of calling CQ Colorado QSO Party.  Ahhh, 20m was as awake as I was and we were well underway to putting Q’s into the logbook.

My somewhat loose goals for the 2013 COQP was A. Have fun and B. attempt to make more contacts than the previous year.  By the way, this number for 2012 COQP was 281.  The end result for my 2013 efforts would most certainly meet the “Have Fun” goal (after all, this is important) and would unfortunately fall short of breaking last year numbers. 

2013 COQP kd0bik

As you can tell from the screen grab from N1MM logger, I missed my Q goal by 23 Q’s. 

So what was different about 2012?  I decided for the 2013 COQP that I would work phone only versus in 2012 I operated mixed mode to include PSK and RTTY.  But I also believe last year I wasn’t jet-lagged and I was able to give a solid effort in the final hours of the contest.  Unfortunately, this year I was physically out of gas around 7 PM. 

Overall I felt band conditions were just as good (or as good as I could remember them to be in 2012).  Below is a map showing the 258 Q’s I worked during the 2013 COQP.  By the way, I created the map using K2DSL free service

co_qso_2013_map

I truly look forward to next year and I hope to work you.

Until next time…

73 de KD0BIK

K4UPG FOBB 2013 Antenna on da Ground!

Grrrrrrrr! and then more Grrrrrrrr’s! FOBB 2013 was a gud one! Grrrrrr!

Anticipated rain and thunderstorms and was not disappointed. Accordingly, I took up my backpack and walked about 1/2 mile to set up under a small pavilion in our housing development’s lakeside park. So far, so good. Originally I planned to have an EFHW for 40m and another one for 20m. Upon unpacking, realized my 40m wire was in my other pack at home. SHUCKS. I had already put a shot over a 40′ high branch and pulled up a paracord to hook to the wire which was not available. Oh well… it happens even to the best of us, eh?

Grrrrr! So I tried to set up the 20m EFHW and after another great shot with my 1 1/2 oz sinker and pulling up a line realized the tree wasn’t going to give me a good shot as it was too close and not very high. Grrrrrrr=ed a bit more!

K4UPG site FOBB Pic

K4UPG FOBB 2013 BB#23

Rethinking mode kicked in and was glad I got out early so all the wasted time did not mess me up. Pulled out my handy 20 ft Jackite and a 17 ft crappie pole and decided to give up on a typical K4UPG “hang ‘em high” antenna and do a very Lazy L. I tried to orient it for a bit of slope towards 330 degrees which shoots from FL to Iowa and provides decent coverage of most of the US. Turned out that low antenna worked great but I think the band was pretty doggone decent for a change too.

So about 15 min before FOBB start time fired off a CQ and made a contact and shot the breeze for a bit to warm up. Nice QRP to QRP contact but not counted for contest. Just for grins. I did notice a few “early out of the blocks ops” were calling CQ BB about 10 min before the clock struck go! Grrrrrrrrr! Sync those watches gentlemen!

Contest Started:

First station heard was Cam out in California N6GA but no joy when I responded to his CQ as there was a mini-pileup on him. Grrrrr… Heard a few more 6′s during the day but no peep from Rem Bear or any others I recognized. I did end up with eight PB’s for the day though and a great TU and Grrrrr to my fellow PB’s: AF40 Chuck- PB 153 TN my last contact of the day (more later); Snowbird FL Bear Don K3RLL PB 187 in PA with his new KX3; Jeff K9JP PB 175 in MI was the loudest signal of the day and blew my ears out till I got the RF and AF turned down Grrrrr! didn’t recognize you as a PB… sri bout dat; N1EU Barry in NY PB 336 got a Grrrrr!; N3AAZ John in MD PB 276 sri 2 ya… missed a Grrrrr!; W1PNS Pete in MA PB 348 got a Grrrrrr!; W5ESE Scotty beam me up Bear PB 287 missed a Grrrr too; WA8REI a perennial PB contact for me gave me a PB 21 style Grrrrrrr! I was closing a contact and Blackjack Bear called me on the guy’s freq so kept it REAL short and sweet as I felt like if we tried to QSY there was too much traffic and we’d not make the connex. Sri Ken Bear was a messy QSO cuz of that. Missed hearing Larry W2LJ this time and listened fur some of you udder PB’s but no connex. Grrrrrr!

All in all worked 25 QSO’s in 17 states and all of them were BB’s! Lightning came up as I was finishing my QSO with AF4O and it was TOO CLOSE. Almost blew me out of my seat but I held onto the key and finished up. Sitting there holding the wire and I started singing, “Antenna on the ground, antenna on the ground, when da lightning is around get your antenna on da ground” to the tune of the famous “Pants on the Ground” song by “General” Larry Platt.

Thus ended a nice outing after 2 hrs and 45 minutes but I truly enjoyed this one. Great number of participants and bet I could have almost doubled the numbers if the lightning did not end the day. Was hearing a lot of new calls just prior to shutting down. At least I got to give the serious contesters some points this year. Maybe next year will be my turn fur sum extra Q’s ? Grrrrrrr!

72 from Orlando, Kelly K4UPG PB 173


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  • Matt W1MST, Managing Editor