From Backblocks To High Seas

I came across this great piece of history via the Google+ page of Cristian YO8TNB and had to share it here for others to enjoy. I have a soft spot for New Zealand, being so close to my country of birth, and I particularly noticed the carefully cultured accent of the announcer. On a more serious note, this video is an invaluable record of the wired and wireless technology used in 1939 and the procedures for transmitting a message from land to sea.

KARS Presentation - Ham Radio Resources on the Internet

At the Katy Amateur Radio Society business meeting I presented a brief rundown of a Internet resources that might interest the Radio Amateur. Here is that presentation in Google Docs format. 

Click here to access the presentation in Google Docs Format

Ham Radio Resources on the Internet

Philco Tropic Model 3012

Last weekend I attended the Houston Vintage Radio Association holiday dinner & picked up a Philco Tropic Model 3012 during the fundraiser auction. I had let a few other radios go without placing a bid and was beginning to think I might go home empty handed when I saw the Philco "on the block". A few seconds later I was the proud owner of this vintage receiver.

Philco Tropic 3012

Information on this model seems a little scarce, however the style of case was introduced by Philco in 1951 and used in their line of AM/FM receivers for many years after that. This particular example is a transformer-less AC/DC set with a potentially live chassis and the unusual (to me) lineup of 14Q7, 7B7, 14B6, 35A5 & 35Y4 vacuum tubes.

What prompted me to bid on this particular radio was the inclusion of two shortwave bands in addition to the typical AM broadcast band. The dials are marked off in meters which also appealed to the ham radio side of my interests.

After attaching a short length of wire as an antenna I was able to pick up signals across the two SW1 & SW2 bands so I'll be interested to see what it can receive with a long wire antenna at night.

After a gentle cleaning with dilute mild detergent to remove dirt I rubbed in some beeswax polish to restore the original gloss. Sadly the plastic dial is cracked in the middle but I can look past that given its a little more unusual than the typical All American Five receiver.

Being over fifty years old I wonder what this radio has been used to listen to and what stories it could tell. Perhaps it gave some youngster his or her first taste of ham radio, listening to shortwave stations and AM QSOs until they received the final demand to, "Switch that radio off and GO TO BED!"

Get your head in the cloud.

Even though my day job is completely centered around Information Technology I still miss changes and shifts in technology that happen practically under my nose. As much as I hear vendors speak about "The Cloud" I haven't had much time to investigate and discover if this "new technology" is something I can put to use.

If you already know what "The Cloud" is then you can skip the following paragraph, otherwise please read on:

The easiest way to understand the cloud is to think of it as a utility, like electricity. When you plug a device into a wall outlet, electricity flows. You didn't generate the electricity yourself. In fact, you probably have no idea where the electricity was generated. It's just there when you want it. All you care about is that your device works. Cloud computing works on the same principle. Through an internet connection (the equivalent of an electrical outlet), you can access whatever applications, files, or data you have opted to store in the cloud--anytime, anywhere, from any device. How it gets to you and where it's stored are not your concern (well, for most people they're not). 

By Rama Ramaswami, Dian Schaffhauser (http://campustechnology.com) 10/31/11

There is no end to the stream of interesting projects that are being developed "in the cloud" and its hard to keep track of them all. Some projects have turned into things that we're all familiar with; Flickr, Facebook & Twitter are a few examples. Some appear and vanish like the proverbial "Flash in the pan" and, since you generally lose access once they run out of steam, it can be disappointing if you have invested any time in those applications.

I've collected a few cloud based applications/services here that might be of interest to the radio amateur and/or experimenter. They look like they should stick around for a while and have already reached a fair level of maturity:

circuits.io: Described as a free circuit editor in your browser, it is actually a lot more. You can not only design practically any kind of circuit using just a web browser, you can turn that circuit into a printed circuit board and then BUY that PCB board online. Several different technologies had to come together to make this into an effective tool. This tool is fairly new but is becoming very popular. Hopefully it will stick around and continue to mature into something great.

WebSDR: While arguably not a "cloud application" it does allow you listen to software defined radios, using a web browser, from anywhere you have internet access.
There are multiple sdr receivers located across the globe using a variety of receivers and antennas. Some are tuned to the HF bands while others cover VHF & UHF bands.
This is an invaluable free service provided by institutions and individuals at their own cost.

APRS.fi: The distributed network of Automatic Packet Reporting System stations, repeaters, clients and map servers could be considered to be "of the cloud" before the cloud even existed. With an APRS equipped radio you can log your position from a GPS, over the air & through another ARPS receiver. This is then sent out (usually) across the internet to other systems which in turn can map your location or update other APRS clients or radios. APRS has also been extended to include the ability to text message which is particularly useful in locations where cell phone SMS messages or email are not possible!

Echolink: Like APRS, Echolink links the Internet to amateur radio. However Echolink links the audio and PTT (push to talk) signals from a radio or software client to a radio in another physical location. If you're stuck in a hotel room or another location without access to a radio you can still "get on the air" using an Echolink client on your Windows, Linux, iOS or Android computer & handheld device. Most Echolink connected stations are VHF/UHF but there are HF stations connected as well. Echolink is not designed to replace radio to radio communications but instead increases the connectivity of amateur radio operators and allows hams, who otherwise would not be able to operate, the pleasure of getting on the air.

As you can see, some of these "cloud apps" pre-date the idea of cloud computing by quite a while. Just another example of amateur radio folks being ahead of the curve without even realizing it.

The trouble with AppleTV

If you happen to use the AppleTV with Netflix you may have been suffering from the same frustration as I have in the last few months. Despite a 12Mbps internet connection, good WiFi signal strength and Apple Airport Extreme Wireless-N router I have been plagued with the dreaded pause & buffer while watching Netflix movies during prime time. This simply doesn't occur while watching the same videos, at the same time, on my iPad, iPhone, Mac desktop or PC laptop.

Perhaps the most aggravating part of the experience is that I think I have the problem worked out but I am unable to do anything about it.

It appears that Netflix have the ability to dynamically change the bandwidth used by each customer during peak times as well as the ability to set the bandwidth used by a customer based on the customers own available bandwidth. These mechanisms, working together, allow the largest number of customers access to Netflix videos and movies during peak times with only a slight degradation in video quality. Although I'm against throttling when used indiscriminately, this particular application makes sense, the alternative is that customers find themselves unable to watch movies during peak times or suffer timeouts or impossibly slow access. This arrangement works well on devices that use an up-to-date Netflix client or browser access, however the Apple TV is, at the moment, where is goes all pear shaped.

I noticed that the AppleTV Netflix app would never dynamically alter the bandwidth used by a streaming video once it had started playing, in fact it seems as though it always plays the video at the highest quality possible even when it would involve a significant time spent buffering before playing. If Netflix does dynamically reduce bandwidth during peak times it would make sense that the AppleTV, unwilling or unable to downshift to a lower bitrate, would start to suffer stalls and constant buffering as it starved for data. Needless to say, this results in a horrible experience for the viewer.

Something that was mentioned on the Apple forums also supported this theory. It was noted that changing the DNS entries could resolve this issue ... at least for a short while. This would make sense if the DNS server pointed to a different Netflix server address where there was less load, and therefore less throttling at that moment.

There are currently 45 pages of users complaints In just one thread alone on the Apple community forums and, as far as I can tell, nobody from apple has made a public announcement that addresses this issue. This doesn't come as a surprise as Apple is typically reluctant to discuss individual bugs and fixes in an open forum.

While people may patiently wait for fixes on iPhone & iPads, they may not wait for Apple to get their act into gear when there are better, less expensive, alternatives available that work well. I am seriously considering swapping out my AppleTv for a Roku 2 XD which, aside from working well with Netflix, has access to much more programming. It would be a shame to lose the ability to mirror the iPad or iPhone display but for the few times I used that feature, compared to all the times I want to sit down and watch a movie at night without having it pause randomly, the Roku wins.

Perhaps Apple will release a fix tomorrow ... perhaps next month. Its not knowing where they are at that cause so much frustration in the user community & that is not a good thing for a company that prides itself on making things that "just work"

 

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