Re: [udrc] UDRC-II squelch on the Yaesu FT-897D → Does DRAWS require this?

Stuart Longland VK4MSL

On 15/11/16 12:33 am, Bryan Hoyer wrote:
The Active Low SQL pin drives a 4.7kOhm resistor to the base of a transistor.

Some radios may require a pull-up resistor to any convenient voltage 3-12V. I’d go with a 4.7k to 3.3V up to 10k at 12V.
Hi all,

The DRAWS board arrived yesterday evening, and today I picked up a new
Raspberry Pi 3 to connect it… so far things seem to be working but I'm
yet to hook up a radio.

Now, with the predecessor board (which has seen some use as a packet
radio station), I had to make a small modification to get audio on the

I've also used this same board with an Yaesu FTM-350AR and a Icom 706 MkIIG.

For the DRAWS, I intend to use it on my bicycle, which runs a FT-857D.
The plan is I'll set up two transceivers: a Wouxun KG-UVD1P I have
laying around set on 145.175MHz for APRS; and use the other port going
to the data jack on the FT-857D. I'll use the DRAWS auxiliary port to
control the CAT interface.

With the Pi acting as a WiFi access point, I should be able to use a
Mumble VoIP server to allow my mobile phone to connect and act as a
"cross-band repeater".

Thus when operating a check-point (like I was for the Yarraman to
Wulkuraka bike ride¹ last year), instead of being tethered to the
bicycle, I can plug my headset into my phone instead and still have
80m-70cm all-mode capability.

For this to work, I still want to be able to use my radio normally, so
basically be able to plug the headset into the microphone/speaker jacks
on the set, and use it like I do now -- as Queensland road rules
preclude me from using a mobile phone whilst in transit *for any reason*
(unless I want an AU$1000 fine for my troubles).

Do I need a pull-up on the SQL lines like I did for the UDRC-II in order
to have normal audio on the FT-857D/897D?

Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...'s backed up on a tape somewhere.


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