开云体育

Good evening all,
I am here looking for help using VARA FM (wide and narrow) with a Kenwood TM-D700A. My interface is a DRA-36, with a 6pin mini din double male connecting cable.
I have read Kevin's post about the D710, which I know is similar in some ways.

If the TM-D700A proves unsuitable, then I have an IC-7100 I can use.

My partner in testing is using a DRA-50 and a TM-D700.

Any advice on settings (on the DRA 36, DRA 50, and Kenwood TM- D700A) would be appreciated.

I have some experience with VARA HF and a tiny bit with VARA FM. A good deal of experience with other software modems.
Dan WD4NG

I have three stations on D710s. All three using DRA's, 30, 36 and 45. One running packet 9600 on band A and VFM on Band B. All work well. I am sure the menu is different but just make sure set to 9600. Levels are important so take your time.?

If you run into problems post them and you will get answers.

Steven
KC3DSO

Dan;

I've had great results doing VARA FM WIDE with my IC-7100 and a DRA-45.

According to Icom support, the sound-card hardware in the radio is limited to a 3KHz audio bandwidth, which limits the radio to 1200 bps "packet" performance on VHF / UHF when using the built-in hardware. That limits you to VARA FM NARROW throughput, which is still around 6Kbps throughput with licensed VARA... vs. about 300 bps throughput for "1200 bps" packet.

With the Masters Communications DRA-45 radio-interface board connected to the mini-DIN 6 data connector, using the "9600 bps receive" pin on the connector, I'm seeing transfer speeds, in both directions, of better than 11Kbps. I've been able to send and receive messages with 100KByte attachments in well under a minute, connecting to a nearby P2P station with matching capability and through a local "VARA FM 9600" RMS gateway station. Those are numbers for licensed VARA (HF or FM)... I think the unlicensed throughput will be about half that.

Make sure you've got the IC-7100 configured in data-9600 mode.

Mark - AD7EF