Speaker Mic Antenna, a weird accessory

As seen on eBay, and it’s yours for about $15. Strange as this gadget may look, I actually see an advantage when it comes to range. A handheld firmly attached to your belt combined with an ordinary speaker microphone won’t translate into an optimal range. The antenna is just a few feet above ground, and the proximity to your body reduces efficiency even further.

That said, it looks weird, very weird. I can’t see myself walking around with it. Update: my reader’s comments reveal that the quality is very poor; purchase not recommended.

Speaker-Mic-Antenna

Review Chirp 0.4.0

I’ve followed the development of Chirp from the date of its inception. but never got around using it much, let alone reviewing it. Shame on me, as there are a lot of good reasons to replace the sometimes crappy Chinese software by Chirp.

This review has a twist you might or might not like: it’s made using a Linux computer. It should work the same in Windows. Well, almost — I had more problems with USB under Windows (especially drivers) than under Linux. If you’re a user of Windows 8.x with its infamous Toys “R” Us interface, I can’t help you. I don’t even know if Chirp will install, nor how to access it. I never played with tiles while in kindergarten, so you’re on your own.

My hardware is a simple single-core AMD Sempron 145 computer, built around an AMD chipset. Just 1 GB of internal memory suffices for all conceivable tasks. Even with multiple applications open I never saw Linux needing virtual memory, e.g no swap file was ever created. The OS version is the 64-bit version of Linux Mint 13 (Maya), a long time support version. MATE is the desktop used here, Cinnamon is the desktop of choice on my notebooks.

Installation
What I tried first is to install Chirp from the Software Manager. That worked, but it was an outdated version. This was to be expected and should have been fixed by adding an extra repository, after which you run an update. Open a terminal window and type:

sudo apt-add-repository ppa:dansmith/chirp-snapshots
sudo apt-get update
sudo apt-get install chirp-daily

For some reason this didn’t work on my system; the new version never materialized. I didn’t feel like figuring this out at this time. Instead I downloaded the program directly from the Chirp website, unpacked it somewhere on the hard drive and made a shortcut to chirpw on my desktop.

*Edit April 6*: Initial instructions updated. These do work, but delete any old version first.

Chirp-dirUsing USB
If you didn’t already, you will have to add yourself to the group ‘dialout’. This will give you the rights to access USB and serial ports. You can do that from MATE or, much faster, open a terminal window and type:

sudo adduser your_username dialout

Logout of the system and re-login again.

Chirp_SelectI plugged in my USB cable (one with a counterfeit Prolific chip inside) and started Chirp. I connected a UV-5R, selected the Radio > Download from radio menu, selected /dev/ttyUSB0 as the port to use, the Baofeng UV-5R as the radio model, and clicked OK. The program started downloading the configuration and the memory contents without a hitch, after which I could add or edit the data.

Frequency List Just click in a field to edit, or right-click on a channel to bring up the edit screen:

Edit MemoryA mouse click on Settings will bring up default or advanced settings, such as a welcome message when the radio starts up. As you can see some the text describing an option (left pane) is not complete. Normally you would resize a pane or window, but that doesn’t work. It’s hardly important, but it would be nice when it’s fixed one day.

Advanced SettingsYou can also play around with the lower- and upper frequency limits, but remember that there’s no guarantee that this will actually work. What does work well is unchecking the VHF/UHF TX Enabled check boxes, which will prevent the radio from transmitting (TX Inhibit).

After the UV-5R I also played with the Baofeng UV-B5 + Chirp, and that worked without a hitch also. Even the test mode (this is actually a service menu) is available, but the maker warns that this is untested. I didn’t want to brick my radio, so I left these options alone.

UV-B5 Test Mode

A very useful function is File > Export, which will save your channels into a .csv file. This file can be imported later and programmed into a totally different radio.

Conclusion
Chirp is free. It became of age. It works on Windows, Linux and Apple computers. It supports a lot of radios, and not only hand helds.There’s even a Chirp Live CD version available from which you can boot, ideal for portable use. Highly recommended; Chirp is here to stay.

Main website: http://chirp.danplanet.com/projects/chirp/wiki/Home

April 1 fun & back to business

Nobody fell for the “Modulating Earthquakes” article, and I didn’t expect anyone to. It was just too obvious.

A different story was the reactions on the Baofeng DA-77 dual band DMR transceiver. The specs looked serious enough, and to the untrained eye the picture of the radio could hold up too. The giveaway was the lack of alphanumeric additions to the keypad, identical to what you see on an ordinary phone. Every DMR transceiver needs those.

I slowly built up this one, mailing pictures months in advance to a few hams, and urging them to be quiet about it. Jason KC5HWB knew about the upcoming prank and posted a similar article.

I didn’t cross-post the Baofeng DA-77 ‘news’ anywhere myself, but sat down and waited. It didn’t take long for the news to appear on forums, Reddit.com, and the radio was even added to the RigReference.com database.

You can delete that one now, guys…. sorry for any inconvenience caused!

RigReference

There were many other great April 1 jokes to be found. My favorite: A guide to the construction of an emergency transceiver, posted by Texas Instruments.

Baofeng DA-77: Dual-band DMR radio

Baofeng DA-77Jason KC5HWB, Joop PA2JM, Carel PA3EHA and I had some pre-production pictures of this radio for quite a while, but some preliminary specs are now public.

The good
The most interesting fact is that the Baofeng DA-77 is a dual-band radio, something which didn’t exist so far. The second most interesting fact is the expected price point: $129,00.

The bad
Things bothering me a bit: only 160 memory positions and a meager 50 zones. Enough for professional use, but compared to the Connect Systems CS-700 (250 zones of 16 channels each) it’s far from impressive.

The ugly
The shell is identical to that of the UV-82, something I don’t like either. I do understand the decision though; re-using existing shells is much more cost effective than designing a new one. Another advantage is that accessories such as batteries are interchangeable.

Both Jason KC5HWB (Grapevine Ham Radio) and me are on Baofeng’s list for getting a review sample. To be honest I hope Jason gets one first, as he’s much more knowledgeable in this area than I am. Keep an eye on his blog.

Specifications

Dual-band, dual standby, mixed mode (DMR/FM) possible
– VOX
– CTCSS / DCS
– PC Programming
– FM
– Flashlight
– Single, group and general call
– Kill, Stun and revive
– Monitor, remote control
– Scanning
– Power saving
– Noise suppression function
– Manual dialing and storage dialing
– SMS
– AMBE+2TM vocoder

Frequency Range: VHF:136-174MHz AND 400-470MHz
– Memory channels: 160
– Zones: 50
– Operating Voltage: 7.4V
– Battery Capacity: 1800mAh
– Battery Average Working Time(5/5/90): 16 hours
– Frequency Stability: ±1.5ppm
– Antenna Impedance: 50Ω

– Power Output: 5/1 Watt (VHF), 4/1 Watt (UHF)
– Spurious Emission: – 36dBm1GHz/ – 30dBm≥1GHz
– Vocoder: AMBE+2TM

– Receiver Sensitivity: Digital 5%BER ≤0.3µV Analog ≤0.35µV
– Audio Distortion: <3%
– Conducted Radiation: –57dBm

STANDARD PACKAGE:

1. Baofeng DA-77 DMR Two-Way Transceiver
2. Dual-band Antenna
3. 110-240V Desktop Charger
4. Belt clip
5. User Manual
6. 1800mAh batterypack

Seismic signals: modulating earthquakes

For the first time in history two scientists succeeded in modulating an earthquake. The theory behind seismic signals was well known, but so far nobody had been able to use earth’s rumbling to communicate between two points. The mode used to modulate an earthquake: AM.

Randall D. Peters, Physics Department, Mercer University, explains:

Amplitude modulation is expected to be visible during large earthquakes, which are known to excite free (eigenmode) oscillations of the Earth. A means for observing the modulation, as illustrated in the materials that follow, is to perform frequency domain calculations on the ‘rectified’ signal, as opposed to the customary calculations that are performed on the ‘raw’ signal.

It’s easy to add meaningful information to such a raw signal. In essence, the raw signal of the earthquake can be seen and treated as an ordinary carrier wave.

The evolution of the spectral content of a signal is easy to analyze in a cumulative spectrum, as shown in the image below:

eq-rawA DX cluster specifically tailored to make use of this groundbreaking technique is in the making.