[arm-allstar] wireline tone control of repeater

[David McGough]

Chris,

HamVoIP/AllStar can generate arbitrary tones, for example using the COP 48 
command. Does your systems need function tones every time PTT is asserted? 
If not, I think COP 48 tone generation would work. If you do need function 
tones with every key-up, a AllStar macro -might- work?

Generating a continuous guard tone will be a problem, I think, with the
current software....I'll think about that some more.  Do you need the
guard tone to remain present during transmissions?


73, David KB4FXC




On Tue, 28 Jan 2020, "c b via ARM-allstar" wrote:

> Brian
> 
> you exactly nailed it, the ptt is not much of a concern as it can be done
> e&m style but the ability to change channels would be great.
> 
> i was hoping someone already thought of this.
> 
> thank you for your time
> 
> On Tue, Jan 28, 2020 at 4:19 PM "Brian Swann via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
> > Doug,
> >
> > The way I read his request, he's looking for Tone Remote Control (TRC)
> > which is an older analog standard for commercial radios. Typically a normal
> > channel 1 keyup is 120ms of "High Level Guard Tone", which is 2175hz,
> > immediately followed by 40ms of the F1 "Function Tone" which is 1950hz.
> > Then the voice is gated through, and a continuous "Low Level Guard Tone" at
> > a level of -30db (compared to full voice modulation) is sent along with the
> > voice. The LLGT keeps the transmitter keyed. The transmitter drops out when
> > the LLGT disappears.
> >
> > By using different function tones, you can change channels, or transmit PL
> > stripped, or do other functions. Most base stations were fairly simple and
> > didn't implement too many different functions.
> >
> > I don't think this is implemented in Hamvoip, although it might be. I don't
> > think it would be very difficult to add in. The advantage would be that a
> > lot of commercial surplus base stations speak this "language" by default.
> >
> > More info in the Wikipedia article
> > https://en.wikipedia.org/wiki/Tone_remote
> >
> > Tone remotes send commands to a base station using *function tones*, a
> > series of two tones in sequence. The first tone is 2,175 Hz and is 100-300
> > milliseconds in length.[6]
> > <https://en.wikipedia.org/wiki/Tone_remote#cite_note-6> The most common
> > second tone is 1,950 Hz. The most commonly used tone sequence in tone
> > remote controls is the channel 1 transmit command. The default for this
> > command consists of a high-level 2,175 Hz followed by a lower-level
> > 1,950 Hz. A continuous, low-level 2,175 Hz tone follows. Voice is
> > multiplexed over the tone. So long as the 2,175 Hz tone is present, the
> > transmitter remains on. An audio notch filter
> > <https://en.wikipedia.org/wiki/Notch_filter> removes the 2,175 Hz
> > low-level
> > tone from the actual transmit audio. General Electric Mobile Radio called
> > the high-level tone, '"Secur-it tone", and called the low-level tone "hold
> > tone." In the industry, the low-level continuous tone is often called,
> > *low-level
> > guard tone*. The low-level tone is present at the same time as transmitted
> > voice.
> >
> > Brian
> > n1bs
> >
> > On Tue, Jan 28, 2020 at 5:53 PM "Doug Crompton via ARM-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> > > Chris,
> > >
> > >  I am not completely clear on what you want to do but the answer is yes
> > you
> > > can control a capable rig either through hardware or CAT control to
> > change
> > > frequency and other things using DTMF. See the howto on this at the
> > > hamvoip.org web page which explains how to use GPIO bits to control BCD
> > > channel changes on capable radios. Hamvoip also has hamlib installed and
> > > using rigctl commands you can control many radios. It is up to the user
> > to
> > > implement this. Do  rigclt -l    at the Linux prompt to see all the
> > > currently controllable rigs.
> > >
> > >
> > > *73 Doug*
> > >
> > > *WA3DSP*
> > >
> > > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> > >
> > > On Tue, Jan 28, 2020 at 11:09 AM "c b via ARM-allstar" <
> > > arm-allstar at hamvoip.org> wrote:
> > >
> > > > does allaratlink support tone control of a station?
> > > >
> > > > for instance using 2175 (switching to low level)  to PTT and using
> > > > different tones to change channel?
> > > >
> > > > or at least the ability to send the correct tone to change channels via
> > > > sending DTMF to the to allstar and then allstar sending the tome out
> > the
> > > > URI to the station?
> > > >
> > > > the application would be a continuous duty remoter using a mastr iii
> > and
> > > > making it multi channel by sending the correct tone to switch channels.
> > > >
> > > > thanks
> > > >
> > > > Chris
> > > > _______________________________________________
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> > > >
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> > > >
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