Just wanted to share my successful results connecting the BlackCat Systems HF Weather Fax iPhone/iPad
app to my SEA 235 marine/SSB radio
and downloading a fax weather
chart! This was a fax broadcast from Pt. Reyes CA, 8680.1.
The HF Weather
Fax app claims it can use the built-in microphone to receive the fax broadcast. I found this to be a problem with having to position the iPhone/iPad near the speaker and background noise
. Each time I tried, the image was blury.
Depending on the radio
, there are different options for connecting the audio to the iPhone/iPad. The SEA 235 radio has a DB9 serial
interface port, with a 1 volt RMS audio output. This is great for connecting to modems; however, the iPhone/iPad microphone input is in milivolts. An attenuation cable needs to be used to drop the audio voltage to microphone voltage. I used the KVConnections cable
, which worked very well.
The app automatically saves the images
, so it can be left running unattended. This is useful, so you don't have to supervise the download(s).
As you can see the image is pretty clear. The app supports rotating the image a few degrees, which I should do. I found that while the engine
is running, there's additional background noise
, which I still need to figure out how to filter this noise from the radio reception
Anyway, I think this is a great way to receive the various weather fax broadcasts without using a Pactor modem
and laptop! The app is $2.99, the cable runs around $30.00, and I did have to make up a DB9 to 3.5mm cable.