[App_rpt-users] Controlling radio with a knob

Skyler F electricity440 at gmail.com
Wed Feb 3 00:07:32 EST 2016


Thanks Steve,

First, this radio does not roll when the channel hits 1. So I could
essentially reset the value to channel 1 every time I want to change
channel.

Second, even if it did roll back to channel 16 after it pased below 1, I
don't see why that would be a problem. I am sure there will be error
sometimes, but for my application, I will mainly be remoting to repeaters
anyway, and I will immediately know if I have the wrong repeater by the
courtesy tone and ID.

This is my idea:
1. Store a file in the hard drive containing the current channel.
2. Set a remote DTMF code for each channel (or one code to increase and one
code to decrease)
3. Skip to the certain channel based on the current value and the DTMF code
parameters
4. Save the current value again.

As long as the current value is saved, even a power outage should keep the
radio synced up with the computer.

That works unless:
The radio resets to channel 1 on power restart. In this case, I would just
set another GPIO pin to reboot the radio and then I would always know what
channel one is.

Any comments? I am assuming the error would be extremely low as long as the
script just slowly cycles through the chanels and proper RF filtering
measures are taking.


By the way, can someone give me a list of good VHF/UHF radios with many
channels where AllStar could digitally control the frequency through a data
port?


On Tue, Feb 2, 2016 at 9:06 PM, Steve Passmore <k6kya at hokeynet.net> wrote:

> I did a quick google search and it appears that radio uses a rotary
> encoder.  Does not have microphone buttons and I'm sure doesn't support cat
> protocols.
>
> You should be able to emulate the rotary encoder.  Do a Google search of
> it. There are examples of doing it with an arduino which should be about
> the same.  The hard part might be determining what channel you are on
> unless you're lucky and the channels don't roll over to the first when you
> reach the end of the list
>
> Steve
> On Feb 2, 2016 7:22 PM, "Steve" <kb9mwr at yahoo.com> wrote:
>
>> That depends on a number of things.  Unless you are planning on just
>> emulating pulses for the microphone up down buttons.
>>
>> If the radio supports some sort of remote tuning (CAT / CIV etc) then it
>> can be addressed digitally though that port.
>>
>> There is an excellent open source (Ham Radio Control Libraries) called
>> hamlib that supports a number of radios that have native remote tuning
>> support.
>>
>> As for the remote knob, you'd likely want a digital(coded) rotary switch.
>>
>> Know that you know what the knob is called you can research how it
>> translates its position to a digitally coded word that could easily be read
>> in to GPIO/etc.  On the other end you'd need to take that word and convert
>> it back to a properly formatted CIV/CAT command, or series of microphone up
>> down puleses. etc.
>>
>> Another possibility that is not as well documented for radio that don't
>> support native CIV/CAT tuning is to look into how the Swedish Remote Rig
>> intercepts and emulates TTL signaling on radios that have remote mounting.
>> I have always admired the somewhat pricey thing and have been meaning to
>> try and serial sniff my own radio to possibly create my own.
>>
>> The ARRL has an okay book sort of on this topic called "Remote Operating
>> for Amateur Radio"  While its not real technical, you'd lkely pick up a few
>> things from it.  I
>>
>> Hopefully this  gives you a good starting place for things to further
>> read up on.  Good luck.  I do believe this is an area of the hobby that
>> needs more attention (with restrictive antenna ordinances for many), so
>> please consider sharing anything you discover.
>>
>> 73
>> Steve, KB9MWR
>>
>> > Is there any way to use GPIO to tell a radio with a turning knob which
>> > channel to switch to?
>> >
>> > Want to use a Kenwood TK-805D for a remote base (this is a 16 channel
>> > radio), but the problem is that I don't have a way to simulate a knob
>> spin.
>> > Does anybody know how these knobs work, and without a mechanical servo
>> how
>> > to tell the radio to switch channels?
>> >
>> > 73
>> > Skyler KD0WHB
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-- 
Skyler Fennell
amsatnet.info
KDØWHB
electricity440 at gmail.com
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