[App_rpt-users] Remote Bases with 16 channel radios?

[Jamey Wright]

If you have a Parallel port you could use the I/O pins there to do BCD assuming the SM120 can do it (which it looks like it can).   It only requires 4 lines to get 16 channels.  To select a particular channel just set the line to the Binary equivalent.



Line

Line

Line

Line

Channel

4

3

2

1

1

0

0

0

0

2

0

0

0

1

3

0

0

1

0

4

0

0

1

1

5

0

1

0

0

6

0

1

0

1

7

0

1

1

0

8

0

1

1

1

9

1

0

0

0

10

1

0

0

1

11

1

0

1

0

12

1

0

1

1

13

1

1

0

0

14

1

1

0

1

15

1

1

1

0

16

1

1

1

1


I do this with a commercial repeater controller and Kenwood TK-7180/8180 radios and it works great.

Jamey Wright
WR4JW

From: app_rpt-users-bounces at ohnosec.org [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Skyler F
Sent: Wednesday, June 10, 2015 8:53 AM
To: app_rpt-users at ohnosec.org
Subject: [App_rpt-users] Remote Bases with 16 channel radios?

Has anybody ever created a remote base with a radio like the SM120 16 channel commercial radio? Would it be possible to use the URI to specify the channel I want to go to, for example, hooking a GPIO pin to the "channel -" button and hooking another to the "channel +" button? So if I am on channel 1 and want to go to 7, the GPIO for "chan +" would have to pulse 6 times.  That wouldn't be very reliable probably because there is no confirmation that you are actually on the right channel, but this is how I would do it:

When a channel change is requested, pulse 16 or more times on the "chan -" button to make sure it is on channel 1. Then count the + button up to the channel number you want to go to. That idea, however wouldn't work on the SM120 because going below channel 1 brings you back to 16.

Another idea I have is put one channel on a frequency reference (maybe those 150mhz re-broadcasts of radio stations?) and then find the channel you want based on that reference.

Another idea yet would be to use a few more GPIO pins to see which elements of the 7-segment displays are lit up and then make an estimate on which channel you currently are on.

 Any other ideas?


73
Skyler kd0whb

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