Share |

Black Cat Systems
Follow our tweets to instantly hear about new releases!

Home
Purchase
Support Forum
Get Our CD-ROM
News
Mac OS X Software
Mac OS 9 Software
Windows Software
Ham Radio iPhone/iPad
Linux Software
Documentation
Support/FAQ
Update Policy
Lost Reg Code?

Radiation Detectors
USB Icom CI-V Interface
MIL-STD-188 Interface

General Interest Programs

  Atomic Mac/PC
  Audiocorder
  Audio Toolbox
  Black Cat Timer
  Diet Sleuth
  iUnit
  Graffikon
  Graph Paper Maker
  Health Tracker
  Knitting Wizard
  Label Wizard
  Prog Audio Gen
  Sound Byte
  Synth 76477

Amateur Radio Programs
  Audiocorder
  Black Cat CW Keyer
  DX Toolbox
  Elmer
  MatchMaker
  MININEC Pro
  Morse Mania
  MultiMode
  mySdrPlayback
  RF Toolbox
  SelCall
  Sonde

iPhone/iPad Apps
  ALE
  Atoms To Go
  dB Calc
  Drill Calc
  DX Toolbox
  Elmer Extra
  Elmer General
  Elmer Tech
  Feld Hellschreiber
  Field Strength Calc
  Function Generator Pad
  GMDSS
  Godafoss
  HF Weather Fax
  iAttenuate
  iFunctionGenerator
  iGeiger
  iSoundex
  iSoundByte
  iSweep
  iUnit
  Morse Mania
  ACARS Pad
  Morse Pad
  NAVTEX Pad
  Packet Pad
  PSK31 Pad
  SSTV Pad
  Photon Calc
  Rad Map Tracker
  RF Link Calc
  SelCall Tone Gen
  Sound Byte
  Sound Byte Control
  Spectrum Pad
  SWBC Schedules
  Synth 76477
  Transmission Line Calc
  Weather Calc
  Wire Calc

Android Apps
  ACARS
  HF Weather Fax
  NAVTEX
  Rad Map Tracker
  SelCall Tone Gen
  SWBC Schedules
  Wire Calc

About Black Cat Systems
Geiger Counter
Site Map
Our software for Mac OSX
Privacy Policy
Press/Media
HFunderground
Apple /// Emulator

Macintosh Links
Shortwave Radio
Pirate Radio
Spy Numbers Stations
Science and Electronics
Ham Radio Software
Geiger Counters


   

HF Weather Fax Marine Radio Fascimile Decoder App For Android

Available in Android Market

(Also available for the iPhone/iPad/iPod Touch)

Do you want to get your weather charts without using an internet connection or a dedicated computer?

HF Weather Fax lets you receive marine weather radiofascimile transmissions on your Android device, using the audio from your HF marine radio. Just set it next to the radio's speaker or headphones, tune in a weather fax frequency, and watch the images come in.

HF Weather Fax is perfect for mariners who want to be able to view the latest weather reports and forecasts.

Received fax images can be manually or automatically saved, and viewed later.

Buy your copy right now, and start decoding and displaying weather fax transmissions in minutes.

Instructions:

HF Weather Fax lets you receive marine weather radiofascimile transmissions on your Android device, using the audio from your HF marine radio. Just set it next to the radio's speaker or headphones, tune in a weather fax frequency, and watch the images come in. Received fax images can be manually or automatically saved, and viewed later.

To use this app, you need to feed the audio output from a your radio into the device. You can do this via one of several ways:

1. Set the device near the radio's speaker to pick up the audio. While easy to do, this is not ideal, as background noise can interfere with the audio, causing garbled decodes.
2. Plug headphones into the radio, and set one earphone near the mic. I find that with good quality headphones, this can work extremely well.
3. Use the microphone input jack of your device, by obtaining an appropriate cable and connecting the radio's line level output to the microphone input.

You can use the volume indicator at the top of the screen to verify that audio is getting into your device, and that the volume level is appropriate.

Tune your radio in USB mode to the weather fax frequency, making note of the fact that you usually need to tune about 1.9 kHz lower in frequency than the listed carrier frequency in a schedule. Fine tune your radio for proper reception of black and white picture elements.

When the app is launched, it will be in Idle mode, waiting for the start tone (which sounds like a loud buzzing) to be transmitted, indicating that a fax image is starting. When the start tone is detected, the app will next go into phasing mode, where it will lock on to the fax image, so it is correctly centered on the screen. Then it will be go into Receiving mode, decoding and displaying the fax image line by line as it is sent.

When the end tone (another loud buzzing) is detected, receiving will stop, and the fax will be automatically saved, if Auto Save was selected in the app Settings. The app will then go back into Idle mode, waiting for the next Start tone.

When first using the app, it is normal for the received image to be slightly slanted, due to slight audio timing variations between devices. This can be corrected by the timing adjustment value, which is located at the top of the screen between the - and + buttons.

Here is the procedure to set the slant:

First tune in a fax station.

Then bring up the menu for HF Weather Fax, and select Start, to force the app to begin receiving the fax. The image will not be correctly aligned, that is, the edge will be somewhere in the middle. That's OK, we'll use the edge (a dark bar going down the screen) to adjust the slant timing.

The default slant value is zero. If the received image is slanting to the right, the timing adjustment must be increased. Press the + button a few times.

If the received image is slanting to the left, the timing adjustment must be decreased. Press the - button a few times.

Now wait several seconds, and see if new picture information for the fax is no longer slanted. (previously received picture information will not be changed) Continue to make adjustments as necessary.

One the fax is no longer slanting to one side or the other, the adjustment is done The timing adjustment value will be automatically saved and used each time you run the app, so typically you only need to go through this procedure once.

You can now select Stop from the app's menu, and wait for a new fax to be transmitted. When the start tone is detected, the app will automatically start decoding it. You can pinch and zoom and scroll around the image as it is being received.

There are a few choices in the app's menu:

Start can be used to manually start reception. Note that in this case, the image will not be correctly aligned.
Stop will stop reception.
Clear will erase the portion of the fax that has already been received.

Settings brings up another screen where you can adjust the slant, as well as set auto save mode. When auto save is checked, received faxes will be automatically saved on your SD card, and copied to an album called Faxes in your Gallery.

Note that proper reception of fax images and detection of the start and stop tones requires good quality reception. Weak signals, noise and other interference can make it difficult or impossible to properly decode and display a fax image. This is not a deficiency of the HF Weather Fax app, but is something that must be corrected with your radio setup.

If you have any questions or comments, please contact us at support@blackcatsystems.com and we will be happy to try and help you. Note that we cannot make recommendations as to specific radios or antennas to use, or answer questions about your particular radio.


Email your comments and questions to support@blackcatsystems.com

Last modified July 6, 2014