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<div class="moz-cite-prefix">As it has become more difficult to
recover quality COS and CTCSS from (some) radios, here are two
solutions - depending on what's required:<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.repeater-builder.com/w3kkc/products/squelch/ms25.html">http://www.repeater-builder.com/w3kkc/products/squelch/ms25.html</a><br>
<a class="moz-txt-link-freetext" href="http://www.repeater-builder.com/w3kkc/products/squelch/sc50.html">http://www.repeater-builder.com/w3kkc/products/squelch/sc50.html</a><br>
<br>
Both will provide the pull to ground required by a URI or modified
FOB. Because the Schottky protection diodes have some voltage
drop, and a "valid" signal on the CM108/119 needs to be around
1.0V or less, these boards will provide the necessary logic levels
for predicable operation. <br>
<br>
Kevin - W3KKC<br>
<br>
<br>
On 3/7/2015 1:58 PM, REDBUTTON_CTRL wrote:<br>
</div>
<blockquote cite="mid:54FB4A5A.6060907@cogeco.ca" type="cite">
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The URI requires a signal that pulls to ground in either active hi
or low modes. Its not enough to see a voltage go hi or low. The
signal from the radio MUST pull to ground or the URI will not see
a change. If the COS/COR from your radio only sources voltage but
doesn't pull to ground, then you need to use that line to drive an
NPN transistor. (2N 3904 or 2N2222 will work).<br>
You can put a 4.7 K resistor on the base and connect your radio's
COS to that. Then connect the Emitter pin to ground and the
Collector pin can be connected to your cor line on the URI. Then
all you have to do is set the "Carrierfrom" to either USB or
USBinvert in the USB radio config. This way the cor line from the
transistor collector will pull to ground when the squelch opens in
your radio.<br>
<br>
Also note that using the transistor will invert your COS/COR
signal. So if you have a voltage that goes high when the squelch
opens then the O/P of your transistor will go low. Then set
Carrierfrom to USBINVERT. (Active low). <br>
<br>
Also to test this make sure you have your Ctcssfrom from set to
no. Once you have this working then you can add ctcss gating the
same way. The CTCSS input on the URI also looks for a signal that
pulls to ground. It doesnt care about applying a voltage to the
pin. <br>
<br>
Both the COR and CTCSS input lines on the URI have internal diodes
to block incoming voltage. Again it only cares if the signal goes
to ground or not.<br>
<br>
Hope this helps.<br>
<br>
Jon VA3RQ<br>
<br>
On 3/7/2015 11:11 AM, Skyler F wrote:
<blockquote
cite="mid:CAJNyT09FOcBK1-AHo3wR9XJ+u27p+TOhNhqKgyZpU4aE4Hcb2w@mail.gmail.com"
type="cite">How can I trigger the Allstar receiver when it gets
a voltage from COS or switch 3 on the fob?
<div><br>
<div> Does it automatically trigger when a voltage is there? </div>
<div><br>
</div>
<div>I added 5v to the COR URIx and did not get any trigger
and I also tried closing SW3 on the home brew fob. Am I
doing something wrong?</div>
<div><br>
</div>
<div>I will be getting a COS out on my radio and want to use
The CTCSS on the radio instead of in AllStar.<br>
<div><br>
</div>
<div><br>
</div>
Thanks
<div>Skyler</div>
</div>
</div>
<br>
</blockquote>
</blockquote>
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