Thursday, March 9, 2017

Seeing IS NOT Hearing - Satellite SDR use on the rise

I happen to be a fan of using Software Defined Radio (SDR) to receive amateur satellites. It is an inexpensive way to view all the signals appearing on a satellite's passband simultaneously.  While I don't normally run SDR full time at my station, from time to time I use it to monitor activity on busy satellite passes because I can view and record all activity.

As a result of more people using SDR on satellites, I have discovered an operating trait that should be explored and discussed.

On more than one occasion, I have given a call to a very specific station, and instead of my scheduled contact had another SDR-based station appear on frequency immediately saying "QRZ? QRZ?" rather than wait and listen to who is calling on the frequency before transmitting. The SDR user saw a signal on their waterfall and clicked on it. They "pounced" on what they perceived to be another station looking to make contact which might not necessarily be the case.

I've see the same thing happen a few times with pileups.  There is an existing pileup in progress when the SDR station comes into the footprint. Rather than wait a short period to listen, they click on the new signal in their waterfall, and immediately proceed to "QRZ" on the frequency of the pileup, sometimes interrupting the flow of existing contacts.

It seems to me the visual nature of SDR waterfalls is causing a temporary lapse in judgement when it comes to a basic ham radio principle that we apply to satellite operating -- listen with our ears before transmitting.

SDR is a great listening tool. With great power comes great responsibility.

Saturday, December 31, 2016

W5PFG Satellite Statistics 2016

Wrapping up 2016, here is a breakdown of all 2,152 contacts by satellite in my log:

The above is from a combined total of 7,431 total in my home station satellite log:

Sorting QSO's by person over time, I created the 2011-2016 and 2016 charts below:

Monday, September 26, 2016

Revisiting Twitter & How to effectively use it for a satellite operation

In November 2014, I did a posting about using Twitter to advertise grid operations.  I suggest reading it before continuing with this post.

Now that a couple of years have passed, I'm glad to see more and more operators are moving towards using the platform.  I am a fan of it because it can be completely open and transparent.  Being cross-platform with many user options makes it a very flexible tool.  I've decided to post a few observations here as a follow-up to my original posting.

On privatizing your feeds...(protecting Tweets)
A few operators insist on making their Twitter feeds private. I'm not sure it really has any benefit other than perhaps reducing a small amount of "junk followers."  I can understand their intentions are good but if your feed is private, it makes a lot of public-facing conversations seem awkward. If you have any "secret" information to offer, you really shouldn't be putting it on Twitter (social media.)

Long conversations...
One thing that can be annoying is long Twitter threads with 5 people trying to have a group conversation.  Sometimes these long threads become hard to follow.  Picture yourself an "outsider" to what is being discussed and see if it makes sense.  Probably won't.  I'm guilty of this but try to stay out of long-winded replies.  Take it to a group "Direct Message" or private email if it gets to be a long discussion.  Just think about it before you "chime in."  There are, of course, always fun exceptions (this one turned into an epic thread.)

Other options, revisited...
I'm a big fan of advertising operations via the AMSAT-NA "AMSAT-BB" mailing list.  Between posting an email to the AMSAT-BB and Twitter, you can get a lot customers for any satellite operation, rare DX/grid or not.  AMSAT-NA's Facebook is a good place to post but it has a smaller audience compared to the openness of Twitter and the AMSAT-BB mailing list.  There are other mailing lists but they are private, individually-controlled lists (empires) that do not cater to the broader amateur radio audience.

Clayton's pet peeve...politicin' 2016
Many of us have multiple interests. I get that.   This is a very heated presidential election cycle.  I'm not a huge fan of cross-pollinating ham radio feeds with political views.  I'm certainly willing to discuss my views with any open-minded individuals who will engage in a two-way conversation...just not on Twitter.  However, what I find very annoying are people who re-tweet political garbage to their ham Twitter feeds.  Normally, I mute those feeds and disable re-Tweets from them.  In some cases, I just un-follow them completely and block them.

Wednesday, September 21, 2016

The Insanity of Grid Chasing - A September 2016 Progress Update

I have been busy working on the upcoming AMSAT Symposium so I haven't focused much on blogging.

However, I have continued to make time to chase new maidenhead grid squares via satellite.  Five and a half years into the addiction, I am still having a lot of fun.

My #1 & # 2 goals on satellite are:

1. Work and confirm all 488 grid squares. These are the same 488 grids required for the Fred Fish Memorial Award (FFMA) on 6m.  However, I am trying to do this via satellite.  As of September 21, I am 35 grids away from the goal.

2. Work and confirm 1000 grids.  Why 1000? Well, I thought it would be interesting to see what I would hit first, the 488 goal or the 1000 goal.  It looks like I am going to be hitting the 1000 unless we get some serious rover action in the DN grid field.

Here's my 488 map and statistics (pink are unconfirmed):

I have leads on a few of these unconfirmed grids. It's just a matter of following up with those leads and working on a schedule to make them happen.

453 of 488 total FFMA grids confirmed as of September 21, 2016.

And now for my confirmed grid map, focused on the continental USA:

Here is my world map.  Click for a larger version:

878 total grid squares confirmed via satellite as of September 21, 2016.

And finally, I leave you with a movie I recommend for people who obsess over chasing grids or chasing real birds.  It shows the complete ridiculousness of what what do in pursuit of our hobby goals.

Friday, July 15, 2016

My AMSAT Field Day Report 2016 "from the road"

There is Field Day and then there is AMSAT Field Day.  Both events occur on the same day with very similar rules with one notable exception: AMSAT Field Day is entirely done via Orbital Satellites Carrying Amateur Radio (OSCAR's.)

In the past, I have mostly participated in AMSAT Field Day from home but I have also known to be on the road.  In 2012, I was traveling with my family to New England and only stopped to listen to a few FM Satellites. That was quite interesting.  From Skyline Drive in Northern Virginia, I was able to hear stations trying to use AO-27 before the transponder had even been activated. There was a telemetry period before the transponder would activate.  During that telemetry period, I was hearing dozens of stations hollering "CQ Field Day" on the uplink frequency.  That was eye-opening.

This year we were heading to Amarillo, Texas on the Saturday of Field Day.  I didn't arrive at camp until late afternoon.  However, there was plenty of time to setup my station and work a few passes.  I hadn't planned on really making a strong attempt at FD this year being that we were away.  However, it is always fun to work some friends via satellite and listen to some of the FD madness.

As I predicted, SO-50 was total garbage.  Too many stations transmitting and few were able to hear. Absolutely pathetic!  It is selfish individuals who don't operate satellites EVER but decide to try once a year that really ruin it for everyone.  Some are overconfident jerks who have made a couple of contacts in the past but think they have it all figured out when it comes time for Field Day so they don't need any practice.

FO-29 was sad this year.  Many stations that were running excess power and couldn't hear. This is evident by all the CQ'ing, HOLA, and 1-2-3 on top of other stations.

It is amazing to me that so many stations overlook the simple fact that you can make satellites contacts (on all current LEO birds) with 5 watts and an Arrow antenna.  Why run 100 watts into a giant array? Are you trying to look like a tough guy?  Are you compensating for something?

I did a fair job with my short Arrow and 20 watts.  I was using my 35ah battery to supply the Icom IC-821.  I worked LilacSat-2, XW-2C, XW-2F, and FO-29.  Not counting a few extra stations that called and worked me on LilacSat-2, I made 7 unique contacts that count for the AMSAT Field Day score.  Not bad for just a handful of passes in a mediocre operating location.

My normal "heavy" /P station.  IC-821 & Arrow.

View to East from my campsite in Amarillo, Texas

Friday, July 8, 2016

Keepin' it Simple: Aiming your antennas when satellite portable

A lot of folks really over-think the "aiming" aspect of operating satellites portable.  There's really just two parts that matter to me:

1. Where the pass will start (AOS)
2. Where the pass will end (LOS)

Beyond that, I don't really spend much time worrying about aim because the computer program that handles antenna positioning is an interface between my brain and my ears.

If the bird starts to get noisy, I move the antenna.  If I'm not as strong as I need to be, I move the antenna.  Simple as that.  Sometimes I get lazy and don't move as much as I might need to move.  Sometimes I move too much.  Simple as that.  The bottom line is, you can aim just based on what signal you are getting back from the satellite. That is the best indicator.  Keep it Simple!!!

Silva "Starter" 1-2-3 Compass

I own about 3 of these.  I keep one in most of the different portable kits for my traveling operations.  They are a simple way to know your headings on a cloudy day or when you are having trouble getting your bearings.  Even an Eagle Scout like me needs a little help.

Working a pass from EM24 at Queen Wilhelmina State Park in Arkansas.

Tuesday, June 21, 2016

My Satellite Picks for Field Day 2016

In May and June 2013, I posted about Field Day on the satellites:
My Plans for 2013 & "Surviving" Field Day 2013, a postmortem

In June 2014 I posted about my "top picks," satellites to work.  Since the landscape has changed slightly, I decided to create a new post for 2016.

My recommendations for satellites during Field Day 2016:

1. FO-29 - Has the largest passband and large footprint.  Doppler easy to manage.   Don't go overboard with big yagis.  An Arrow is sufficient for Field Day.  FO-29 should be easily heard with 3-7 elements on UHF.  Good coax and a preamp make it even better.  If you are running an amplifier, you should probably be taken out back and beaten with a rubber hose.

2. Chinese XW-2 linear satellites: XW-2A, XW-2C, XW-2F.  If you can't hear them, you should probably give up satellites permanently.  Because they are mode B (U/V) birds, they are easy to hear and should work even on mediocre antennas with bad coax.  However, because they are mode B that means adjusting for Doppler is more challenging for some people.  Remember, tune the higher band (in this case, the UPLINK - 70cm.)

3. AO-73 - Easy to hear as the XW-2's.  Can be difficult to adjust for Doppler for those who are new.  Normally just active when transponder is in darkness.   It should be in transponder mode even in full sun, but very likely will be put there by AMSAT-UK by Friday night.  A solid bird.  Don't try using computer control.

4. UKube-1 - Recently active, we don't know if it will be in transponder mode during Field Day, but you should give it a try if you've made it this far.  It is comparable to the XW-2's and AO-73 but with a quirk: When the primary beacon comes on, everyone is basically shut out of the satellite for a brief period.  Expect this 2-3 times during a pass.  Another easy one to hear and also avoid computer control.

5. AO-85 - FM, likely a zoo.  This will be your best bet for an FM contact.  I'd try a descending pass (coming from North to South.)  Don't expect to use an HT and Arrow, but it could work.  It should be easy to hear with an Arrow, but hard to get in with 5 watts.

6. AO-7 - Easily forced into Mode A during eclipse cycle by Alligators.  Difficult to use when there are several high-powered stations using CW or SSB.  Generally, I'd only recommend this one on very late night passes.  The old bird is especially weak right now and has been known to shift modes unexpectedly due to QRO stations.  My advice: avoid unless you really know what you're doing or you have plenty of time to play and be shut-out.

7. SO-50 - FM. Say no more.  I'd recommend it only for middle-of-the-night (graveyard shift) attempts.  During the day it will likely be a zoo.  Don't bother even trying to make a contact if you are not actually participating in Field Day. Give the other suckers a chance.  And please, don't call CQ.  If you do work SO-50, please make one contact and then remain silent.  Even if others call you, you've made your one QSO.  Let someone else have their turn.

8. AO-51 - FM.  If this satellite is still on your Field Day list, you are a moron and should surrender your license, throw your radios in the garbage, and probably give up driving automobiles, too.

PS: Don't rule out the ISS (packet) and NO-84 (PSK31 transponder.)  This blog post focuses on voice.

I have no bias against FM transponders. In fact, I love them.  I just think they are a poor choice for Field Day.  If it's all you have, good luck to you.  Try AO-85 and possible SO-50.  We will be lucky if LilacSat-2 is turned on for us.

Finally, don't be a turd and run QRO CW on a bird.
If you need to send more than a few dits to find yourself, slow down and look at everything. Chances are, you're doing something wrong!!!