[Milsurplus] 2 meter mil rigs in a ham world

[D C *Mac* Macdonald]

 <486975.15397.qm at web52912.mail.re2.yahoo.com>
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Repeaters made with converted commercial transceivers have
greatly restricted receive audio bandpass.  This is/was done
so that the CTCSS tones would not be heard by the user.
That is why the tones are "stripped" by the repeater.  The
most commonly used repeater controllers have the capability
to generate whatever tone is desired for the repeater XMTR.
They also decode whatever tone is used by the user's XMTR.
Thus=2C it is possible for different tones to be used for each
side of the repeater.
=20
73 - Mac=2C K2GKK/5
Oklahoma City=2C OK

> Date: Fri=2C 25 Sep 2009 18:47:53 -0700
> From: gzook at yahoo.com
> To: milsurplus at mailman.qth.net=3B w2hx at w2hx.com
> Subject: Re: [Milsurplus] 2 meter mil rigs in a ham world
>=20
> The main problem is that the majority of amateur radio repeaters do not t=
ransmit the CTCSS tone. Due to the nature of the audio recovery in most FM =
receivers the CTCSS tone is "stripped" and then reduced even more by a reje=
ction filter that is part of just about every CTCSS decoder. The CTCSS tone=
 has to be reintroduced into the transmit audio and most=2C but not all=2C =
amateur radio repeaters do not do this.
>=20
> Therefore=2C one would have to receive a signal on the input frequency to=
 the repeater to be able to determine what the actual tone is.
>=20
> Remember=2C that a receiving decoder is not necessary to copy the repeate=
r. An encoder is necessary for opening the receiver of the repeater but has=
 nothing to do with receiving the signal from the repeater.
>=20
> Glen=2C K9STH
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> Website: http://k9sth.com
>=20
>=20
> --- On Fri=2C 9/25/09=2C W2HX <w2hx at w2hx.com> wrote:
>=20
> I've been playing with a PRC-128 with the high-band option (covers 2 mete=
rs) and in my area I can't really use it with amateur repeaters because of =
the CTCSS requirement. I've also been thinking about looking for a URC-110 =
for my car for 2 meter ops (also looking at a yaesu).
>=20
> Several folks on the list have suggested using an outboard CTCSS tone gen=
erator/tone squelch board.  This would seem to be my only option and there =
seemed to be several available on the market. The one thing that always stu=
ck in the back of my mind was the fact that I would have to remember what t=
one to use when switching repeaters. Also=2C when traveling=2C I might not =
want to pull out a repeater directory at 60 mph!
>=20
> Well=2C I found two very interesting products and I thought others might =
be interested (hence the post here these are also applicable for pre-CTCSS =
amateur rigs).  Both products are from PIEXX.com (not affiliated with them)=
.
>=20
> The first is a standard encoder/decoder but also has a small LCD display =
that will read the CTCSS tone and display it for you. But the neat part is =
it will also automatically set the transmit tone for you too. So by simply =
listening on the frequency and hearing the repeater=2C your tone will be se=
t=2C no fumbling while driving.  VERY interesting!
>=20
> Here is the product and the manual to it:
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> http://www.piexx.com/index.php?main_page=3Dproduct_info&cPath=3D6&product=
s_id=3D47
>=20
> http://www.piexx.com/tonelcd/tonelcd.pdf 		 	   		  =