RE: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[Nate Duehr]

The TS-64 also SEEMS to detect STE properly. Well kinda...

It loses "lock" on the CTCSS during the 180 degree phase shift,
and then it "sees" it again not too long after.  Resulting in
what I've dubbed "double bounce" unkeying when a TS-64 is
detecting CTCSS from a stock GE encoder.

Not sure I LIKE that behavior, but I've come up with ways to
utilize it and cover up the secondary "detect" in my
applications.
--
  Nate Duehr
  n...@natetech.com


On Thu, 19 Nov 2009 17:41 -0800, "Eric Lemmon"
 wrote:


The TS-64 does indeed encode a reverse burst STE signal.
Unfortunately, it
has the 180-degree phase shift, because that is really easy to
do. It
cannot encode a 120-degree phase shift, so that means it is
fairly useless
with Motorola and a few other radio brands. When I contacted Comm
Spec
about this a few years ago, the engineer I spoke with seemed not
to know
that there are two standard reverse burst formats.
73, Eric Lemmon WB6FLY
-Original Message-
From: [1]repeater-buil...@yahoogroups.
com
[mailto:[2]repeater-buil...@yahoogroups.com] On Behalf Of wspx472
Sent: Thursday, November 19, 2009 6:47 AM
To: [3]repeater-buil...@yahoogroups.com
Subject: [Repeater-Builder] Re: Zetron 38A not sending reverse
burst
I tried that but decided not to go that route for now. The reason
is that I
need that hang time to tell how well I am hearing the repeater.
It is 900 MHz and users are few and far between. If usage picks
up, I will
probably turn off PL during the hang time. I want to try it a
while like it
is but I am still thinking about with doing away with the
controller and
just having a PL decoder and ID'er. The ComSpec TS-64 does send
reverse
burst.
--- In [4]repeater-buil...@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> , Jim Brown
 wrote:
>
> I use several Z-38A controllers in ham applications. I get
around the
squelch crash problem by setting the Z-38A to stop sending a PL
tone as soon
as a user unkeys. The short tail is still there from the
repeater, but the
lack of a tone to a receiver lets the audio shut off while
carrier is still
present, and does not generate a squelch crash.
>
> I believe Nate calls this a 'chicken burst' though I have never
heard that
term before -
>
> A second benefit of shutting off the tone after a user unkeys
is that it
allows in-band links with no ping-pong effects due to the tails
talking to
each other.
>
> 73 - Jim W5ZIT
>
> --- On Wed, 11/18/09, Eric Lemmon  wrote:
>
> From: Eric Lemmon 
> Subject: RE: [Repeater-Builder] Zetron 38A not sending reverse
burst
> To: [5]repeater-buil...@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>
> Date: Wednesday, November 18, 2009, 1:09 PM
>
>
>
>
>
>
>
> Â
>
>
>
>
>
>
>
>
>
> You have discovered one of many "dirty little secrets" that
apply to
>
> aftermarket tone panels. When designing the 38A tone panel, and
many other
>
> products, Zetron overlooked the fact that reverse burst is
essential in
the
>
> repeated audio. From a close examination of the 38A manual and
schematics,
>
> it appears that it will decode CTCSS reverse burst and CDCSS
turnoff code,
>
> and MAY generate CDCSS turnoff code, but I see no evidence that
it can
>
> generate reverse burst. That alone is a major shortcoming!
>
>
>
> Zetron is not the only manufacturer that ignored reverse burst
encoding
when
>
> designing a community repeater controller. Instrument
Associates, which
>
> produced the i20R "On-site Repeater Controller" for the
Motorola GR1225
>
> desktop repeater, did likewise. I did not realize this until I
found that
>
> squelch crashes were immediately heard as soon as I put the
i20R in
service.
>
> Although some fans of the old "Highway Patrol" shows starring
Broderick
>
> Crawford may enjoy the sound of a squelch crash, I do not, nor
do any of
my
>
> radio users. That i20R was pulled from service immediately, and
put on the
>
> shelf!
>
>
>
> There are two different formats for CTCSS reverse burst STE
(Squelch Tail
>
> Elimination) that are defined in TIA-603-C, the international
standard for
>
> land-mobile radio performance and design. One format, used
principally by
>
> Motorola, uses a 120-degree phase shift, while the other
format, used by
>
> Kenwood and many others, uses a 180-degree phase shift. Since
modern
radios
>
> often use digital signal processing to encode and decode
low-speed data
>
> (CTCSS and CDCSS), it is all too easy to design a circuit that
responds
>
> perfectly to 180-degree phase shift but ignores 120-degree
phase shift,
and
>
> vice-versa. Zetron and others couldn't be bothered to create a
CTCSS
>
> encoder tha

Re: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wd8chl]

wspx472 wrote:
> Thanks for the useful info. Very interesting. On a somewhat similar
> topic, we ran into a situation where the local Motorola shop sold a
> local entity a repeater and several portables using a DPL code that
> only certain models of Motorola have. We checked every Kenwood,
> Vertex, and even some other Motorola models and none could do this
> particular code. I found a work around for the lack of reverse burst.
> I am using a Tait exciter which has its own hang timer. I just set
> that timer to hold the carrier up for a fraction of a second after
> the 38A drops out. This gives the PL decoder in the mobiles/portables
> time to close the squelch before the carrier drops.

That'll work on nearly all radios. I found my wife's VX-1 won't even 
respond to that. I checked-once the decoder opens, it stays open until 
the carrier squelch closes-forever.  It does do DPL turn-off code though.

Jim

Re: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[Cort Buffington]

I've gone so far as to make a couple of "changes" to a Motorola MSR2000 to not 
send reverse burst, and hold the transmitter a little longer than a normal 
reverse burst -- that is to say, chicken burst. That was a different 
application, what I'll do next time I deal with a Micor or MSR with a Zetron 
(which may be never) -- that is to say, use a factory card just to get the 
extra carrier hang with no reeds in it and jumpered as if there were no card :)

On Nov 20, 2009, at 9:24 AM, wspx472 wrote:

> Thanks for the useful info. Very interesting. On a somewhat similar topic, we 
> ran into a situation where the local Motorola shop sold a local entity a 
> repeater and several portables using a DPL code that only certain models of 
> Motorola have. We checked every Kenwood, Vertex, and even some other Motorola 
> models and none could do this particular code. 
> I found a work around for the lack of reverse burst. I am using a Tait 
> exciter which has its own hang timer. I just set that timer to hold the 
> carrier up for a fraction of a second after the 38A drops out. This gives the 
> PL decoder in the mobiles/portables time to close the squelch before the 
> carrier drops.
> 
> --- In Repeater-Builder@yahoogroups.com, wd8chl  wrote:
> >
> > Eric Lemmon wrote:
> > > The TS-64 does indeed encode a reverse burst STE signal. Unfortunately, it
> > > has the 180-degree phase shift, because that is really easy to do. It
> > > cannot encode a 120-degree phase shift, so that means it is fairly useless
> > > with Motorola and a few other radio brands. When I contacted Comm Spec
> > > about this a few years ago, the engineer I spoke with seemed not to know
> > > that there are two standard reverse burst formats.
> > > 
> > > 73, Eric Lemmon WB6FLY
> > > 
> > 
> > I wouldn't be too worried about it. An awful lot of Motorola's will do 
> > OK with 180 shift, especially higher-tier radios.
> > But then there's some that are just weird. I have a Maxar-80 on GMRS. It 
> > doesn't like the Com-Spec TP-3200 tone panel. It also doesn't like the 
> > P-100 handheld on talkaround. But it does like the GE MPA and Phoenix-SX 
> > I have. Go figure.
> > The Micor repeaters with a factory reed decoder however, seem to be 
> > pretty liberal on what they respond to. Just about any radio with RB 
> > will be at least partially muted. The TK-805D has a really short delay 
> > on the STE drop out, so the decoder doesn't get a chance to fully spin 
> > down before the transmitter goes away. But just about any other radio 
> > worked OK.
> > I'd leave it, frankly.
> >
> 
> 

--
Cort Buffington
H: +1-785-838-3034
M: +1-785-865-7206










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[Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wspx472]

Thanks for the useful info. Very interesting. On a somewhat similar topic, we 
ran into a situation where the local Motorola shop sold a local entity a 
repeater and several portables using a DPL code that only certain models of 
Motorola have. We checked every Kenwood, Vertex, and even some other Motorola 
models and none could do this particular code. 
I found a work around for the lack of reverse burst. I am using a Tait exciter 
which has its own hang timer. I just set that timer to hold the carrier up for 
a fraction of a second after the 38A drops out. This gives the PL decoder in 
the mobiles/portables time to close the squelch before the carrier drops.




--- In Repeater-Builder@yahoogroups.com, wd8chl  wrote:
>
> Eric Lemmon wrote:
> > The TS-64 does indeed encode a reverse burst STE signal.  Unfortunately, it
> > has the 180-degree phase shift, because that is really easy to do.  It
> > cannot encode a 120-degree phase shift, so that means it is fairly useless
> > with Motorola and a few other radio brands.  When I contacted Comm Spec
> > about this a few years ago, the engineer I spoke with seemed not to know
> > that there are two standard reverse burst formats.
> > 
> > 73, Eric Lemmon WB6FLY
> >  
> 
> I wouldn't be too worried about it. An awful lot of Motorola's will do 
> OK with 180 shift, especially higher-tier radios.
> But then there's some that are just weird. I have a Maxar-80 on GMRS. It 
> doesn't like the Com-Spec TP-3200 tone panel. It also doesn't like the 
> P-100 handheld on talkaround. But it does like the GE MPA and Phoenix-SX 
> I have. Go figure.
> The Micor repeaters with a factory reed decoder however, seem to be 
> pretty liberal on what they respond to. Just about any radio with RB 
> will be at least partially muted. The TK-805D has a really short delay 
> on the STE drop out, so the decoder doesn't get a chance to fully spin 
> down before the transmitter goes away. But just about any other radio 
> worked OK.
> I'd leave it, frankly.
>

Re: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wd8chl]

Eric Lemmon wrote:
> The TS-64 does indeed encode a reverse burst STE signal.  Unfortunately, it
> has the 180-degree phase shift, because that is really easy to do.  It
> cannot encode a 120-degree phase shift, so that means it is fairly useless
> with Motorola and a few other radio brands.  When I contacted Comm Spec
> about this a few years ago, the engineer I spoke with seemed not to know
> that there are two standard reverse burst formats.
> 
> 73, Eric Lemmon WB6FLY
>  

I wouldn't be too worried about it. An awful lot of Motorola's will do 
OK with 180 shift, especially higher-tier radios.
But then there's some that are just weird. I have a Maxar-80 on GMRS. It 
doesn't like the Com-Spec TP-3200 tone panel. It also doesn't like the 
P-100 handheld on talkaround. But it does like the GE MPA and Phoenix-SX 
I have. Go figure.
The Micor repeaters with a factory reed decoder however, seem to be 
pretty liberal on what they respond to. Just about any radio with RB 
will be at least partially muted. The TK-805D has a really short delay 
on the STE drop out, so the decoder doesn't get a chance to fully spin 
down before the transmitter goes away. But just about any other radio 
worked OK.
I'd leave it, frankly.

RE: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[Eric Lemmon]

The TS-64 does indeed encode a reverse burst STE signal.  Unfortunately, it
has the 180-degree phase shift, because that is really easy to do.  It
cannot encode a 120-degree phase shift, so that means it is fairly useless
with Motorola and a few other radio brands.  When I contacted Comm Spec
about this a few years ago, the engineer I spoke with seemed not to know
that there are two standard reverse burst formats.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of wspx472
Sent: Thursday, November 19, 2009 6:47 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

  

I tried that but decided not to go that route for now. The reason is that I
need that hang time to tell how well I am hearing the repeater. 
It is 900 MHz and users are few and far between. If usage picks up, I will
probably turn off PL during the hang time. I want to try it a while like it
is but I am still thinking about with doing away with the controller and
just having a PL decoder and ID'er. The ComSpec TS-64 does send reverse
burst.

--- In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> , Jim Brown  wrote:
>
> I use several Z-38A controllers in ham applications.  I get around the
squelch crash problem by setting the Z-38A to stop sending a PL tone as soon
as a user unkeys.  The short tail is still there from the repeater, but the
lack of a tone to a receiver lets the audio shut off while carrier is still
present, and does not generate a squelch crash.
> 
> I believe Nate calls this a 'chicken burst' though I have never heard that
term before - 
> 
> A second benefit of shutting off the tone after a user unkeys is that it
allows in-band links with no ping-pong effects due to the tails talking to
each other.
> 
> 73 - Jim  W5ZIT
> 
> --- On Wed, 11/18/09, Eric Lemmon  wrote:
> 
> From: Eric Lemmon 
> Subject: RE: [Repeater-Builder] Zetron 38A not sending reverse burst
> To: Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> 
> Date: Wednesday, November 18, 2009, 1:09 PM
> 
> 
> 
> 
> 
> 
> 
> Â 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> You have discovered one of many "dirty little secrets" that apply to
> 
> aftermarket tone panels. When designing the 38A tone panel, and many other
> 
> products, Zetron overlooked the fact that reverse burst is essential in
the
> 
> repeated audio. From a close examination of the 38A manual and schematics,
> 
> it appears that it will decode CTCSS reverse burst and CDCSS turnoff code,
> 
> and MAY generate CDCSS turnoff code, but I see no evidence that it can
> 
> generate reverse burst. That alone is a major shortcoming!
> 
> 
> 
> Zetron is not the only manufacturer that ignored reverse burst encoding
when
> 
> designing a community repeater controller. Instrument Associates, which
> 
> produced the i20R "On-site Repeater Controller" for the Motorola GR1225
> 
> desktop repeater, did likewise. I did not realize this until I found that
> 
> squelch crashes were immediately heard as soon as I put the i20R in
service.
> 
> Although some fans of the old "Highway Patrol" shows starring Broderick
> 
> Crawford may enjoy the sound of a squelch crash, I do not, nor do any of
my
> 
> radio users. That i20R was pulled from service immediately, and put on the
> 
> shelf!
> 
> 
> 
> There are two different formats for CTCSS reverse burst STE (Squelch Tail
> 
> Elimination) that are defined in TIA-603-C, the international standard for
> 
> land-mobile radio performance and design. One format, used principally by
> 
> Motorola, uses a 120-degree phase shift, while the other format, used by
> 
> Kenwood and many others, uses a 180-degree phase shift. Since modern
radios
> 
> often use digital signal processing to encode and decode low-speed data
> 
> (CTCSS and CDCSS), it is all too easy to design a circuit that responds
> 
> perfectly to 180-degree phase shift but ignores 120-degree phase shift,
and
> 
> vice-versa. Zetron and others couldn't be bothered to create a CTCSS
> 
> encoder that could be switched between the two reverse-burst formats, so
> 
> they just ignored the problem.
> 
> 
> 
> 73, Eric Lemmon WB6FLY
> 
> 
> 
> 
> 
> -Original Message-
> 
> From: Repeater-Builder@ yahoogroups. com
> 
> [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of wspx472
> 
> Sent: Wednesday, November 18, 2009 10:15 AM
> 
> To: Repeater-Builder@ yahoogroups. com
> 
> Subject: [Repeater-Builder] Zetron 38A not sending reverse burst
> 
> 
> 
> I am trying to get a repeater going using a 38A and find that it doesn't
> 
> send reverse burst. I thought I saw that it did in the manual but upon
> 
> looking again, all I see is where it responds to reverse burst. Does
anyone
> 
> know for sure if it is supposed to send reverse burst? If so, how do I get
> 
> it to do it?
>

Re: [Repeater-Builder] Re: Zetron 38A not sending reverse burst

[Cort Buffington]

Anybody have a 38Max they want to sell me cheap? (he he... now that we're on an 
anti-Zetron thread :) :)

On Nov 19, 2009, at 9:13 AM, wb0vhb wrote:

> From my experience, the Model 38 and 48 will not do reverse burst.
> 
> I did however use a Arcomm audio delay board and accomplished the same 
> results.
> 
> http://www.arcomcontrollers.com/rc210/rad.html
> 
> Then I decided I want a repeater controller capable of additional ports and 
> dropped the Model 48 I was using and went with the Arcom RC-210 and Com Spec 
> SS-64 encoders with reverse burst built-in.
> 
> http://www.com-spec.com/ss64.htm
> 
> Randy
> 
> --- In Repeater-Builder@yahoogroups.com, "wspx472"  wrote:
> >
> > I am trying to get a repeater going using a 38A and find that it doesn't 
> > send reverse burst. I thought I saw that it did in the manual but upon 
> > looking again, all I see is where it responds to reverse burst. Does anyone 
> > know for sure if it is supposed to send reverse burst? If so, how do I get 
> > it to do it?
> >
> 
> 

--
Cort Buffington
H: +1-785-838-3034
M: +1-785-865-7206










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[Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wb0vhb]

>From my experience, the Model 38 and 48 will not do reverse burst.

I did however use a Arcomm audio delay board and accomplished the same results.

http://www.arcomcontrollers.com/rc210/rad.html

Then I decided I want a repeater controller capable of additional ports and 
dropped the Model 48 I was using and went with the Arcom RC-210 and Com Spec 
SS-64 encoders with reverse burst built-in.

http://www.com-spec.com/ss64.htm

Randy



--- In Repeater-Builder@yahoogroups.com, "wspx472"  wrote:
>
> I am trying to get a repeater going using a 38A and find that it doesn't send 
> reverse burst. I thought I saw that it did in the manual but upon looking 
> again, all I see is where it responds to reverse burst. Does anyone know for 
> sure if it is supposed to send reverse burst? If so, how do I get it to do it?
>

[Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wspx472]

I tried that but decided not to go that route for now. The reason is that I 
need that hang time to tell how well I am hearing the repeater.  
It is 900 MHz and users are few and far between. If usage picks up, I will 
probably turn off PL during the hang time. I want to try it a while like it is 
but I am still thinking about with doing away with the controller and just 
having a PL decoder and ID'er. The ComSpec TS-64 does send reverse burst.

--- In Repeater-Builder@yahoogroups.com, Jim Brown  wrote:
>
> I use several Z-38A controllers in ham applications.  I get around the 
> squelch crash problem by setting the Z-38A to stop sending a PL tone as soon 
> as a user unkeys.  The short tail is still there from the repeater, but the 
> lack of a tone to a receiver lets the audio shut off while carrier is still 
> present, and does not generate a squelch crash.
> 
> I believe Nate calls this a 'chicken burst' though I have never heard that 
> term before - 
> 
> A second benefit of shutting off the tone after a user unkeys is that it 
> allows in-band links with no ping-pong effects due to the tails talking to 
> each other.
> 
> 73 - Jim  W5ZIT
> 
> --- On Wed, 11/18/09, Eric Lemmon  wrote:
> 
> From: Eric Lemmon 
> Subject: RE: [Repeater-Builder] Zetron 38A not sending reverse burst
> To: Repeater-Builder@yahoogroups.com
> Date: Wednesday, November 18, 2009, 1:09 PM
> 
> 
> 
> 
> 
> 
> 
>  
> 
> 
> 
>   
> 
> 
> 
>   
>   
>   You have discovered one of many "dirty little secrets" that apply to
> 
> aftermarket tone panels.  When designing the 38A tone panel, and many other
> 
> products, Zetron overlooked the fact that reverse burst is essential in the
> 
> repeated audio.  From a close examination of the 38A manual and schematics,
> 
> it appears that it will decode CTCSS reverse burst and CDCSS turnoff code,
> 
> and MAY generate CDCSS turnoff code, but I see no evidence that it can
> 
> generate reverse burst.  That alone is a major shortcoming!
> 
> 
> 
> Zetron is not the only manufacturer that ignored reverse burst encoding when
> 
> designing a community repeater controller.  Instrument Associates, which
> 
> produced the i20R "On-site Repeater Controller" for the Motorola GR1225
> 
> desktop repeater, did likewise.  I did not realize this until I found that
> 
> squelch crashes were immediately heard as soon as I put the i20R in service.
> 
> Although some fans of the old "Highway Patrol" shows starring Broderick
> 
> Crawford may enjoy the sound of a squelch crash, I do not, nor do any of my
> 
> radio users.  That i20R was pulled from service immediately, and put on the
> 
> shelf!
> 
> 
> 
> There are two different formats for CTCSS reverse burst STE (Squelch Tail
> 
> Elimination) that are defined in TIA-603-C, the international standard for
> 
> land-mobile radio performance and design.  One format, used principally by
> 
> Motorola, uses a 120-degree phase shift, while the other format, used by
> 
> Kenwood and many others, uses a 180-degree phase shift.  Since modern radios
> 
> often use digital signal processing to encode and decode low-speed data
> 
> (CTCSS and CDCSS), it is all too easy to design a circuit that responds
> 
> perfectly to 180-degree phase shift but ignores 120-degree phase shift, and
> 
> vice-versa.  Zetron and others couldn't be bothered to create a CTCSS
> 
> encoder that could be switched between the two reverse-burst formats, so
> 
> they just ignored the problem.
> 
> 
> 
> 73, Eric Lemmon WB6FLY
> 
>  
> 
> 
> 
> -Original Message-
> 
> From: Repeater-Builder@ yahoogroups. com
> 
> [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of wspx472
> 
> Sent: Wednesday, November 18, 2009 10:15 AM
> 
> To: Repeater-Builder@ yahoogroups. com
> 
> Subject: [Repeater-Builder] Zetron 38A not sending reverse burst
> 
> 
> 
> I am trying to get a repeater going using a 38A and find that it doesn't
> 
> send reverse burst. I thought I saw that it did in the manual but upon
> 
> looking again, all I see is where it responds to reverse burst. Does anyone
> 
> know for sure if it is supposed to send reverse burst? If so, how do I get
> 
> it to do it?
>

[Repeater-Builder] Re: Zetron 38A not sending reverse burst

[wspx472]

Thanks for the reply. The 38A sounded really good until I started to try to 
program and install it. The more I fool with the thing, the less I like it.  
After getting all my levels set up, I sent varying frequencies starting at 200 
HZ and going to 3 KHz to check the response. I noticed a roll off above about 
1.5 KHz even though I have all jumpers and switches set to "flat." Upon 
checking with a scope, I find it is occurring in the 38A. I also noticed that 
the audio through the repeater isn't as "crisp" as it is on direct. Of course 
it is also passing through a receiver and transmitter but I kind of think that 
38A is causing some of the problem. I really wanted to get this thing on the 
air next week but I am seriously considering scrapping the controller 
altogether. I have a TS-64 I can use for PL decoding and encoding and I think I 
saw a Com Spec IDer around. I also think there is a CAT200 around but I am not 
too fond of them either. Looks like decision time.



--- In Repeater-Builder@yahoogroups.com, "Eric Lemmon"  wrote:
>
> You have discovered one of many "dirty little secrets" that apply to
> aftermarket tone panels.  When designing the 38A tone panel, and many other
> products, Zetron overlooked the fact that reverse burst is essential in the
> repeated audio.  From a close examination of the 38A manual and schematics,
> it appears that it will decode CTCSS reverse burst and CDCSS turnoff code,
> and MAY generate CDCSS turnoff code, but I see no evidence that it can
> generate reverse burst.  That alone is a major shortcoming!
> 
> Zetron is not the only manufacturer that ignored reverse burst encoding when
> designing a community repeater controller.  Instrument Associates, which
> produced the i20R "On-site Repeater Controller" for the Motorola GR1225
> desktop repeater, did likewise.  I did not realize this until I found that
> squelch crashes were immediately heard as soon as I put the i20R in service.
> Although some fans of the old "Highway Patrol" shows starring Broderick
> Crawford may enjoy the sound of a squelch crash, I do not, nor do any of my
> radio users.  That i20R was pulled from service immediately, and put on the
> shelf!
> 
> There are two different formats for CTCSS reverse burst STE (Squelch Tail
> Elimination) that are defined in TIA-603-C, the international standard for
> land-mobile radio performance and design.  One format, used principally by
> Motorola, uses a 120-degree phase shift, while the other format, used by
> Kenwood and many others, uses a 180-degree phase shift.  Since modern radios
> often use digital signal processing to encode and decode low-speed data
> (CTCSS and CDCSS), it is all too easy to design a circuit that responds
> perfectly to 180-degree phase shift but ignores 120-degree phase shift, and
> vice-versa.  Zetron and others couldn't be bothered to create a CTCSS
> encoder that could be switched between the two reverse-burst formats, so
> they just ignored the problem.
> 
> 73, Eric Lemmon WB6FLY
>  
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wspx472
> Sent: Wednesday, November 18, 2009 10:15 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Zetron 38A not sending reverse burst
> 
>   
> 
> I am trying to get a repeater going using a 38A and find that it doesn't
> send reverse burst. I thought I saw that it did in the manual but upon
> looking again, all I see is where it responds to reverse burst. Does anyone
> know for sure if it is supposed to send reverse burst? If so, how do I get
> it to do it?
>

[Repeater-Builder] Re: Zetron 38A Manual

[n3gh_1]

Eric,

Take a look under files, directory Zetron, on this site.
I have copied from my manual the schematics you describe.
Let me know if you find anything missing from them.

73,
N3GH
George
--- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <[EMAIL PROTECTED]> 
wrote:
>
> We're still not home yet- the copies of the schematics on the link shown
> below do not overlap, so there is a data gap at that point.  Please, if
> someone has the original paper copies of the schematics, take them to a
> Kinko's or a commercial graphics shop and have them scanned as 11 by 17
> sheets directly into PDF.  If that is too much trouble, please
contact me
> directly at mycall at verizon dot net.
> 
> 73, Eric Lemmon WB6FLY
>  
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Mike Morris
WA6ILQ
> Sent: Tuesday, July 29, 2008 9:57 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re: Zetron 38A Manual
> 
> Look on <http://www.repeater-builder.com/zetron/zetron-index.html
> <http://www.repeater-builder.com/zetron/zetron-index.html> >
> 
> The Zetron 38a manual and schematics are there.
> 
> Mike WA6ILQ
> 
> At 05:36 PM 07/29/08, you wrote:
> >Tim,
> >
> >Did you ever get the schematics for the Zetron 38a?
> >I have them in PDF files and can email them to you.
> >Let me know.
> >
> >N3GH
> >George
> >
> >
> >--- In Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> , "m0hlm"  wrote:
> > >
> > > Hi I got the Manual incl. scematic, diagram, for diffrent Zetron
> > > Logics .send me an email >M0HLM@<
> > >
> > >
> > >
> > > --- In Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> , "Scott Zimmerman"
> > >  wrote:
> > > >
> > > > I apologize. I didn't realize that the PDF had blank pages.
> > > >
> > > > Scott
> > > >
> > > > Scott Zimmerman
> > > > Amateur Radio Call N3XCC
> > > > 474 Barnett Road
> > > > Boswell, PA 15531
> > > > - Original Message -
> > > > From: Mike Morris WA6ILQ
> > > > To: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> 
> > > > Sent: Friday, April 25, 2008 1:52 AM
> > > > Subject: Re: [Repeater-Builder] Zetron 38A Manual
> > > >
> > > >
> > > > Yep, he did.
> > > >
> > > > The schematics pages in that PDF file are blank (unfortunately
> > > it's all we have).
> > > > A good example of Zetron customer service at its best.
> > > >
> > > > I've heard it from several people - they buy Zetron, they shelve
> > > the manual. Several
> > > > years later the unit needs repair - maybe they zap a COR input,
> > > or something.
> > > > They pull the manual off the shelf, and the schematics are
> > > blank. Unhappy
> > > > customers tend to make later purchases elsewhere.
> > > >
> > > > Mike
> > > >
> > > > At 12:06 PM 04/24/08, you wrote:
> > > >
> > > > Doesn't anyone check the website or do a google search
> > > anymore??
> > > >
> > > > http://www.repeater-builder.com/zetron/zetron-model-38a-inst%
> <http://www.repeater-builder.com/zetron/zetron-model-38a-inst%> 
> > > 20manual-025-9043y.pdf
> > > >
> > > > Scott
> > > >
> > > > Scott Zimmerman
> > > > Amateur Radio Call N3XCC
> > > > 474 Barnett Rd
> > > > Boswell, PA 15531
> > > >
> > > > - Original Message -
> > > >
> > > > From: Jack Davis
> > > >
> > > > To: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> 
> > > >
> > > > Sent: Wednesday, April 23, 2008 11:24 PM
> > > >
> > > > Subject: [Repeater-Builder] Zetron 38A Manual
> > > >
> > > >
> > > > Does anyone have the schematics for a Zetron Model 38A
> > > repeater controller? The pages are blank in my manual and I need to
> > > fix it.
> > > >
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Jack
> > > >
> > > > K6YC
> > > >
> > > >
> > > > --
> > > ---
> > > >
> > > > No virus found in this incoming message.
> > > >
> > > > Checked by AVG.
> > > >
> > > > Version: 7.5.524 / Virus Database: 269.23.2/1389 - Release
> > > Date: 4/21/2008 8:34 AM
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --
> > > ---
> > > >
> > > >
> > > > No virus found in this incoming message.
> > > > Checked by AVG.
> > > > Version: 7.5.524 / Virus Database: 269.23.5/1399 - Release Date:
> > > 4/26/2008 2:17 PM
> > > >
> > >
> >
> >
> >
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
>

RE: [Repeater-Builder] Re: Zetron 38A Manual

[Eric Lemmon]

We're still not home yet- the copies of the schematics on the link shown
below do not overlap, so there is a data gap at that point.  Please, if
someone has the original paper copies of the schematics, take them to a
Kinko's or a commercial graphics shop and have them scanned as 11 by 17
sheets directly into PDF.  If that is too much trouble, please contact me
directly at mycall at verizon dot net.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Morris WA6ILQ
Sent: Tuesday, July 29, 2008 9:57 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Zetron 38A Manual

Look on <http://www.repeater-builder.com/zetron/zetron-index.html
<http://www.repeater-builder.com/zetron/zetron-index.html> >

The Zetron 38a manual and schematics are there.

Mike WA6ILQ

At 05:36 PM 07/29/08, you wrote:
>Tim,
>
>Did you ever get the schematics for the Zetron 38a?
>I have them in PDF files and can email them to you.
>Let me know.
>
>N3GH
>George
>
>
>--- In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> , "m0hlm" <[EMAIL PROTECTED]> wrote:
> >
> > Hi I got the Manual incl. scematic, diagram, for diffrent Zetron
> > Logics .send me an email >[EMAIL PROTECTED]<
> >
> >
> >
> > --- In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> , "Scott Zimmerman"
> >  wrote:
> > >
> > > I apologize. I didn't realize that the PDF had blank pages.
> > >
> > > Scott
> > >
> > > Scott Zimmerman
> > > Amateur Radio Call N3XCC
> > > 474 Barnett Road
> > > Boswell, PA 15531
> > > - Original Message -
> > > From: Mike Morris WA6ILQ
> > > To: Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> 
> > > Sent: Friday, April 25, 2008 1:52 AM
> > > Subject: Re: [Repeater-Builder] Zetron 38A Manual
> > >
> > >
> > > Yep, he did.
> > >
> > > The schematics pages in that PDF file are blank (unfortunately
> > it's all we have).
> > > A good example of Zetron customer service at its best.
> > >
> > > I've heard it from several people - they buy Zetron, they shelve
> > the manual. Several
> > > years later the unit needs repair - maybe they zap a COR input,
> > or something.
> > > They pull the manual off the shelf, and the schematics are
> > blank. Unhappy
> > > customers tend to make later purchases elsewhere.
> > >
> > > Mike
> > >
> > > At 12:06 PM 04/24/08, you wrote:
> > >
> > > Doesn't anyone check the website or do a google search
> > anymore??
> > >
> > > http://www.repeater-builder.com/zetron/zetron-model-38a-inst%
<http://www.repeater-builder.com/zetron/zetron-model-38a-inst%> 
> > 20manual-025-9043y.pdf
> > >
> > > Scott
> > >
> > > Scott Zimmerman
> > > Amateur Radio Call N3XCC
> > > 474 Barnett Rd
> > > Boswell, PA 15531
> > >
> > > - Original Message -
> > >
> > > From: Jack Davis
> > >
> > > To: Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> 
> > >
> > > Sent: Wednesday, April 23, 2008 11:24 PM
> > >
> > > Subject: [Repeater-Builder] Zetron 38A Manual
> > >
> > >
> > > Does anyone have the schematics for a Zetron Model 38A
> > repeater controller? The pages are blank in my manual and I need to
> > fix it.
> > >
> > >
> > >
> > > Thanks,
> > >
> > > Jack
> > >
> > > K6YC
> > >
> > >
> > > --
> > ---
> > >
> > > No virus found in this incoming message.
> > >
> > > Checked by AVG.
> > >
> > > Version: 7.5.524 / Virus Database: 269.23.2/1389 - Release
> > Date: 4/21/2008 8:34 AM
> > >
> > >
> > >
> > >
> > >
> > > --
> > ---
> > >
> > >
> > > No virus found in this incoming message.
> > > Checked by AVG.
> > > Version: 7.5.524 / Virus Database: 269.23.5/1399 - Release Date:
> > 4/26/2008 2:17 PM
> > >
> >
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>


 

[Repeater-Builder] Re: Zetron 38a Schematics

[n3gh_1]

Bob,

OK , I give up!  What important information is missing?
I have reviewed my manual and didn't find any other schematics.
There are some program log sheets if anyone wants those I can post
those as well.

73,
N3GH
George

--- In Repeater-Builder@yahoogroups.com, "Bob M." <[EMAIL PROTECTED]> wrote:
>
> That's like totally great news, dude!
> 
> One very important piece of information missing, however.
> 
> Bob M.
> ==
> --- On Tue, 7/29/08, n3gh_1 <[EMAIL PROTECTED]> wrote:
> 
> > From: n3gh_1 <[EMAIL PROTECTED]>
> > Subject: [Repeater-Builder] Zetron 38a Schematics
> > To: Repeater-Builder@yahoogroups.com
> > Date: Tuesday, July 29, 2008, 8:45 PM
> > Greetings All!
> > 
> > I have uploaded PDF files of schematics for the Zetron 38A
> > controller.
> > 
> > Have fun!
> > 
> > 73, N3GH
> > George
>

Re: [Repeater-Builder] Re: Zetron 38A Manual

[Mike Morris WA6ILQ]

Look on 

The Zetron 38a manual and schematics are there.

Mike WA6ILQ

At 05:36 PM 07/29/08, you wrote:
>Tim,
>
>Did you ever get the schematics for the Zetron 38a?
>I have them in PDF files and can email them to you.
>Let me know.
>
>N3GH
>George
>
>
>--- In Repeater-Builder@yahoogroups.com, "m0hlm" <[EMAIL PROTECTED]> wrote:
> >
> > Hi I got the Manual incl. scematic, diagram, for diffrent Zetron
> > Logics .send me an email >[EMAIL PROTECTED]<
> >
> >
> >
> > --- In Repeater-Builder@yahoogroups.com, "Scott Zimmerman"
> >  wrote:
> > >
> > > I apologize. I didn't realize that the PDF had blank pages.
> > >
> > > Scott
> > >
> > > Scott Zimmerman
> > > Amateur Radio Call N3XCC
> > > 474 Barnett Road
> > > Boswell, PA 15531
> > >   - Original Message -
> > >   From: Mike Morris WA6ILQ
> > >   To: Repeater-Builder@yahoogroups.com
> > >   Sent: Friday, April 25, 2008 1:52 AM
> > >   Subject: Re: [Repeater-Builder] Zetron 38A Manual
> > >
> > >
> > >   Yep, he did.
> > >
> > >   The schematics pages in that PDF file are blank (unfortunately
> > it's all we have).
> > >   A good example of Zetron customer service at its best.
> > >
> > >   I've heard it from several people - they buy Zetron, they shelve
> > the manual.  Several
> > >   years later the unit needs repair - maybe they zap a COR input,
> > or something.
> > >   They pull the manual off the shelf, and the schematics are
> > blank.  Unhappy
> > >   customers tend to make later purchases elsewhere.
> > >
> > >   Mike
> > >
> > >   At 12:06 PM 04/24/08, you wrote:
> > >
> > > Doesn't anyone check the website or do a google search
> > anymore??
> > >
> > > http://www.repeater-builder.com/zetron/zetron-model-38a-inst%
> > 20manual-025-9043y.pdf
> > >
> > > Scott
> > >
> > > Scott Zimmerman
> > > Amateur Radio Call N3XCC
> > > 474 Barnett Rd
> > > Boswell, PA 15531
> > >
> > >   - Original Message -
> > >
> > >   From: Jack Davis
> > >
> > >   To: Repeater-Builder@yahoogroups.com
> > >
> > >   Sent: Wednesday, April 23, 2008 11:24 PM
> > >
> > >   Subject: [Repeater-Builder] Zetron 38A Manual
> > >
> > >
> > >   Does anyone have the schematics for a Zetron Model 38A
> > repeater controller?  The pages are blank in my manual and I need to
> > fix it.
> > >
> > >
> > >
> > >   Thanks,
> > >
> > >   Jack
> > >
> > >   K6YC
> > >
> > >
> > > ---
> > ---
> > >
> > >   No virus found in this incoming message.
> > >
> > >   Checked by AVG.
> > >
> > >   Version: 7.5.524 / Virus Database: 269.23.2/1389 - Release
> > Date: 4/21/2008 8:34 AM
> > >
> > >
> > >
> > >
> > >
> > > ---
> > ---
> > >
> > >
> > >   No virus found in this incoming message.
> > >   Checked by AVG.
> > >   Version: 7.5.524 / Virus Database: 269.23.5/1399 - Release Date:
> > 4/26/2008 2:17 PM
> > >
> >
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>

[Repeater-Builder] Re: Zetron 38A Manual

[n3gh_1]

Tim,

Did you ever get the schematics for the Zetron 38a?
I have them in PDF files and can email them to you.
Let me know.

N3GH
George


--- In Repeater-Builder@yahoogroups.com, "m0hlm" <[EMAIL PROTECTED]> wrote:
>
> Hi I got the Manual incl. scematic, diagram, for diffrent Zetron 
> Logics .send me an email >[EMAIL PROTECTED]<
> 
> 
> 
> --- In Repeater-Builder@yahoogroups.com, "Scott Zimmerman" 
>  wrote:
> >
> > I apologize. I didn't realize that the PDF had blank pages.
> > 
> > Scott
> > 
> > Scott Zimmerman 
> > Amateur Radio Call N3XCC
> > 474 Barnett Road
> > Boswell, PA 15531
> >   - Original Message - 
> >   From: Mike Morris WA6ILQ 
> >   To: Repeater-Builder@yahoogroups.com 
> >   Sent: Friday, April 25, 2008 1:52 AM
> >   Subject: Re: [Repeater-Builder] Zetron 38A Manual
> > 
> > 
> >   Yep, he did.  
> > 
> >   The schematics pages in that PDF file are blank (unfortunately 
> it's all we have).
> >   A good example of Zetron customer service at its best.
> > 
> >   I've heard it from several people - they buy Zetron, they shelve 
> the manual.  Several 
> >   years later the unit needs repair - maybe they zap a COR input, 
> or something. 
> >   They pull the manual off the shelf, and the schematics are 
> blank.  Unhappy 
> >   customers tend to make later purchases elsewhere.
> > 
> >   Mike
> > 
> >   At 12:06 PM 04/24/08, you wrote:
> > 
> > Doesn't anyone check the website or do a google search 
> anymore??
> >  
> > http://www.repeater-builder.com/zetron/zetron-model-38a-inst%
> 20manual-025-9043y.pdf 
> >  
> > Scott
> >  
> > Scott Zimmerman
> > Amateur Radio Call N3XCC
> > 474 Barnett Rd
> > Boswell, PA 15531
> > 
> >   - Original Message - 
> > 
> >   From: Jack Davis 
> > 
> >   To: Repeater-Builder@yahoogroups.com 
> > 
> >   Sent: Wednesday, April 23, 2008 11:24 PM
> > 
> >   Subject: [Repeater-Builder] Zetron 38A Manual
> > 
> > 
> >   Does anyone have the schematics for a Zetron Model 38A 
> repeater controller?  The pages are blank in my manual and I need to 
> fix it.
> > 
> > 
> > 
> >   Thanks,
> > 
> >   Jack
> > 
> >   K6YC
> > 
> > 
> > ---
> ---
> > 
> >   No virus found in this incoming message.
> > 
> >   Checked by AVG. 
> > 
> >   Version: 7.5.524 / Virus Database: 269.23.2/1389 - Release 
> Date: 4/21/2008 8:34 AM
> > 
> > 
> >
> > 
> > 
> > ---
> ---
> > 
> > 
> >   No virus found in this incoming message.
> >   Checked by AVG. 
> >   Version: 7.5.524 / Virus Database: 269.23.5/1399 - Release Date: 
> 4/26/2008 2:17 PM
> >
>

[Repeater-Builder] Re: Zetron 38A Manual

[m0hlm]

Hi I got the Manual incl. scematic, diagram, for diffrent Zetron 
Logics .send me an email >[EMAIL PROTECTED]<



--- In Repeater-Builder@yahoogroups.com, "Scott Zimmerman" 
<[EMAIL PROTECTED]> wrote:
>
> I apologize. I didn't realize that the PDF had blank pages.
> 
> Scott
> 
> Scott Zimmerman 
> Amateur Radio Call N3XCC
> 474 Barnett Road
> Boswell, PA 15531
>   - Original Message - 
>   From: Mike Morris WA6ILQ 
>   To: Repeater-Builder@yahoogroups.com 
>   Sent: Friday, April 25, 2008 1:52 AM
>   Subject: Re: [Repeater-Builder] Zetron 38A Manual
> 
> 
>   Yep, he did.  
> 
>   The schematics pages in that PDF file are blank (unfortunately 
it's all we have).
>   A good example of Zetron customer service at its best.
> 
>   I've heard it from several people - they buy Zetron, they shelve 
the manual.  Several 
>   years later the unit needs repair - maybe they zap a COR input, 
or something. 
>   They pull the manual off the shelf, and the schematics are 
blank.  Unhappy 
>   customers tend to make later purchases elsewhere.
> 
>   Mike
> 
>   At 12:06 PM 04/24/08, you wrote:
> 
> Doesn't anyone check the website or do a google search 
anymore??
>  
> http://www.repeater-builder.com/zetron/zetron-model-38a-inst%
20manual-025-9043y.pdf 
>  
> Scott
>  
> Scott Zimmerman
> Amateur Radio Call N3XCC
> 474 Barnett Rd
> Boswell, PA 15531
> 
>   - Original Message - 
> 
>   From: Jack Davis 
> 
>   To: Repeater-Builder@yahoogroups.com 
> 
>   Sent: Wednesday, April 23, 2008 11:24 PM
> 
>   Subject: [Repeater-Builder] Zetron 38A Manual
> 
> 
>   Does anyone have the schematics for a Zetron Model 38A 
repeater controller?  The pages are blank in my manual and I need to 
fix it.
> 
> 
> 
>   Thanks,
> 
>   Jack
> 
>   K6YC
> 
> 
> ---
---
> 
>   No virus found in this incoming message.
> 
>   Checked by AVG. 
> 
>   Version: 7.5.524 / Virus Database: 269.23.2/1389 - Release 
Date: 4/21/2008 8:34 AM
> 
> 
>
> 
> 
> ---
---
> 
> 
>   No virus found in this incoming message.
>   Checked by AVG. 
>   Version: 7.5.524 / Virus Database: 269.23.5/1399 - Release Date: 
4/26/2008 2:17 PM
>

[Repeater-Builder] Re: Zetron 38A Manual (Diagrams & the Sacramento, CA. Wednesday Lunch Hour)

[skipp025]

Hi Jack, 

The Wednesday (no longer super secret) Electronics, Railroad, 
Broadcast, Computer Geek/people lunch hour moved back over to the 
VIP Buffet location on El Camino. However the place is now called 
East Meets West Buffet. Please come join us again at the new/old 
location when you have a spare moment. 

Had you attended last Wednesday lunch you could have asked that 
trouble-maker Skipp if he had the circuit diagrams for the Zetron 
38a unit. As a Zetron Reseller he would have said "probably" and 
they'd be in your Email In-Box by now.  

So... go check your Email In-Box. 

cheers, 
Skipp 

skipp025 at yahoo.com 
www.radiowrench.com 

ps: Anyone who can make the Sacramento Wednesday Lunch would 
always be welcome to join us. 


> "Jack Davis" <[EMAIL PROTECTED]> wrote:
>
> Repeater BuilderTake a look at the PDF on the web site, it is
missing the schematics just like mine is.  They left blank pages in
the manual just to remind you they were missing!
> 
> Jack
> K6YC
> 
> Posted by: "Scott Zimmerman" [EMAIL PROTECTED]   scottn3xcc 
> Thu Apr 24, 2008 12:06 pm (PDT) 
> Doesn't anyone check the website or do a google search anymore??
> 
>
http://www.repeater-builder.com/zetron/zetron-model-38a-inst%20manual-025-9043y.pdf
> 
> Scott
> 
> Scott Zimmerman
> Amateur Radio Call N3XCC
> 474 Barnett Rd
> Boswell, PA 15531
> 
> - Original Message - 
> From: Jack Davis 
> To: Repeater-Builder@yahoogroups.com 
> Sent: Wednesday, April 23, 2008 11:24 PM
> Subject: [Repeater-Builder] Zetron 38A Manual
> 
> Does anyone have the schematics for a Zetron Model 38A repeater
controller? The pages are blank in my manual and I need to fix it.
> 
> Thanks,
> Jack
> K6YC
>

[Repeater-Builder] Re: Zetron 38A Manual

[Jack Davis]

Repeater BuilderTake a look at the PDF on the web site, it is missing the 
schematics just like mine is.  They left blank pages in the manual just to 
remind you they were missing!

Jack
K6YC

Posted by: "Scott Zimmerman" [EMAIL PROTECTED]   scottn3xcc 
Thu Apr 24, 2008 12:06 pm (PDT) 
Doesn't anyone check the website or do a google search anymore??

http://www.repeater-builder.com/zetron/zetron-model-38a-inst%20manual-025-9043y.pdf

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Rd
Boswell, PA 15531

- Original Message - 
From: Jack Davis 
To: Repeater-Builder@yahoogroups.com 
Sent: Wednesday, April 23, 2008 11:24 PM
Subject: [Repeater-Builder] Zetron 38A Manual

Does anyone have the schematics for a Zetron Model 38A repeater controller? The 
pages are blank in my manual and I need to fix it.

Thanks,
Jack
K6YC


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Messages in this 

[Repeater-Builder] Re: Zetron 38A Manual

[Peter Burgess]

I checked my manual and I have the circuit pages.  I will try and post them 
asap.  Might take a couple of days.

Cheers Peter

Re: [Repeater-Builder] Re: zetron 38a

[Mike Morris WA6ILQ]

If anybody wants to do a photo article on recovering a
Zetron (i.e. getting back to the default password) or
on replacing the battery, or adding an outside battery,
let me know.

Mike
co-web-master at repeater-builder

At 07:20 PM 11/04/07, you wrote:
>Depending on the type of Dallas chip you can add an
>external battery to them.  There are instructions on how
>to do it on the internet.  I ran across them when looking
>for a way to fix a problem I was having with the bios on a
>Sun server.  A little search on Google might bring you
>some instructions.
>
>Vern
>KI4ONW
>
>On Sun, 4 Nov 2007 19:18:32 -0800 (PST)
>   Jim Brown <[EMAIL PROTECTED]> wrote:
> > Be sure to align pin 1 with the socket and with the
> >Dallas Semiconductor Battery Backup and the memory chip
> >and plug them into U15.  My units do not even have
> >sockets installed in U16, but I suspect the two locations
> >are pretty much in parallel except for an address line to
> >give the unit more ram, or to use a smaller capacity ram
> >chip and use two instead of the one.
> >
> >  I happen to have a unit down waiting for a new battery
> >backup chip, and they are hard to find.  The jobbers have
> >them but one wants a minimum order of $1000 and the other
> >one I checked out wanted $88 for a minimum order.  My
> >units are over 15 years old and well beyond the battery
> >life of the Dallas Semiconductor backup unit.
> >
> >  73 - Jim  W5ZIT
> >
> > rwjohn49 <[EMAIL PROTECTED]> wrote:
> >  Thanks for the help. Need a little more
> >clarification. I have never
> > used one of these before, so I don't want to blow it up.
> >I have a
> > chip that is stackedI suppose this is the one. I
> >took it apart
> > and wouldn't you know it, I managed to turn the chip
> >socket with the
> > smaller chip inside around, so I am not sure of its
> >orientation. It
> > has a cut out on the small chip inside the socket. I
> >suppose this
> > marks pin one and I would place the large chip with
> >its dot in
> > the same direction. Now, I have an empty chip space.
> >What socket
> > does it go into... U15 or U16should have marked
> >itdumb. Sorry
> > for the bother, but a little bit of orientation will
> >keep me from
> > blowing it up...
> >
> > Thanks
> >
> > ron
> >
> > --- In Repeater-Builder@yahoogroups.com, "Maire-Radios"
> > > [EMAIL PROTECTED]> wrote:
> >>
> >> take out the chip with the battery and unplug the chip
> >>from the
> > battery give it 3 mins or so and put it back should
> >default.
> >>
> >>
> >> - Original Message -
> >> From: rwjohn49
> >> To: Repeater-Builder@yahoogroups.com
> >> Sent: Saturday, November 03, 2007 9:11 PM
> >> Subject: [Repeater-Builder] zetron 38a
> >>
> >>
> >> Folks,
> >>
> >> I just got a Zetron 38A at a hamfest. Works fine in the
> >>repeater
> > but I
> >> have tried the password code and no results. It is
> >>listed in the
> > book
> >> as 12123#. Someone must have changed it... What do I do
> >>now? Can
> > it
> >> be set back to a factory default?
> >>
> >> thanks,
> >>
> >> ron

Re: [Repeater-Builder] Re: zetron 38a

[mung]

Depending on the type of Dallas chip you can add an 
external battery to them.  There are instructions on how 
to do it on the internet.  I ran across them when looking 
for a way to fix a problem I was having with the bios on a 
Sun server.  A little search on Google might bring you 
some instructions.

Vern
KI4ONW

On Sun, 4 Nov 2007 19:18:32 -0800 (PST)
  Jim Brown <[EMAIL PROTECTED]> wrote:
> Be sure to align pin 1 with the socket and with the 
>Dallas Semiconductor Battery Backup and the memory chip 
>and plug them into U15.  My units do not even have 
>sockets installed in U16, but I suspect the two locations 
>are pretty much in parallel except for an address line to 
>give the unit more ram, or to use a smaller capacity ram 
>chip and use two instead of the one.
>   
>  I happen to have a unit down waiting for a new battery 
>backup chip, and they are hard to find.  The jobbers have 
>them but one wants a minimum order of $1000 and the other 
>one I checked out wanted $88 for a minimum order.  My 
>units are over 15 years old and well beyond the battery 
>life of the Dallas Semiconductor backup unit.
>   
>  73 - Jim  W5ZIT
> 
> rwjohn49 <[EMAIL PROTECTED]> wrote:
>  Thanks for the help. Need a little more 
>clarification. I have never 
> used one of these before, so I don't want to blow it up. 
>I have a 
> chip that is stackedI suppose this is the one. I 
>took it apart 
> and wouldn't you know it, I managed to turn the chip 
>socket with the 
> smaller chip inside around, so I am not sure of its 
>orientation. It 
> has a cut out on the small chip inside the socket. I 
>suppose this 
> marks pin one and I would place the large chip with 
>its dot in 
> the same direction. Now, I have an empty chip space. 
>What socket 
> does it go into... U15 or U16should have marked 
>itdumb. Sorry 
> for the bother, but a little bit of orientation will 
>keep me from 
> blowing it up...
> 
> Thanks
> 
> ron
> 
> --- In Repeater-Builder@yahoogroups.com, "Maire-Radios" 
> [EMAIL PROTECTED]> wrote:
>>
>> take out the chip with the battery and unplug the chip 
>>from the 
> battery give it 3 mins or so and put it back should 
>default.
>> 
>> 
>> - Original Message - 
>> From: rwjohn49 
>> To: Repeater-Builder@yahoogroups.com 
>> Sent: Saturday, November 03, 2007 9:11 PM
>> Subject: [Repeater-Builder] zetron 38a
>> 
>> 
>> Folks,
>> 
>> I just got a Zetron 38A at a hamfest. Works fine in the 
>>repeater 
> but I 
>> have tried the password code and no results. It is 
>>listed in the 
> book 
>> as 12123#. Someone must have changed it... What do I do 
>>now? Can 
> it 
>> be set back to a factory default?
>> 
>> thanks,
>> 
>> ron
>>
> 
> 
> 
> 
> 
> __
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection 
>around 
> http://mail.yahoo.com 

Re: [Repeater-Builder] Re: zetron 38a

[Jim Brown]

Be sure to align pin 1 with the socket and with the Dallas Semiconductor 
Battery Backup and the memory chip and plug them into U15.  My units do not 
even have sockets installed in U16, but I suspect the two locations are pretty 
much in parallel except for an address line to give the unit more ram, or to 
use a smaller capacity ram chip and use two instead of the one.
   
  I happen to have a unit down waiting for a new battery backup chip, and they 
are hard to find.  The jobbers have them but one wants a minimum order of $1000 
and the other one I checked out wanted $88 for a minimum order.  My units are 
over 15 years old and well beyond the battery life of the Dallas Semiconductor 
backup unit.
   
  73 - Jim  W5ZIT

rwjohn49 <[EMAIL PROTECTED]> wrote:
  Thanks for the help. Need a little more clarification. I have never 
used one of these before, so I don't want to blow it up. I have a 
chip that is stackedI suppose this is the one. I took it apart 
and wouldn't you know it, I managed to turn the chip socket with the 
smaller chip inside around, so I am not sure of its orientation. It 
has a cut out on the small chip inside the socket. I suppose this 
marks pin one and I would place the large chip with its dot in 
the same direction. Now, I have an empty chip space. What socket 
does it go into... U15 or U16should have marked itdumb. Sorry 
for the bother, but a little bit of orientation will keep me from 
blowing it up...

Thanks

ron

--- In Repeater-Builder@yahoogroups.com, "Maire-Radios"  wrote:
>
> take out the chip with the battery and unplug the chip from the 
battery give it 3 mins or so and put it back should default.
> 
> 
> - Original Message - 
> From: rwjohn49 
> To: Repeater-Builder@yahoogroups.com 
> Sent: Saturday, November 03, 2007 9:11 PM
> Subject: [Repeater-Builder] zetron 38a
> 
> 
> Folks,
> 
> I just got a Zetron 38A at a hamfest. Works fine in the repeater 
but I 
> have tried the password code and no results. It is listed in the 
book 
> as 12123#. Someone must have changed it... What do I do now? Can 
it 
> be set back to a factory default?
> 
> thanks,
> 
> ron
>



 

 __
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

[Repeater-Builder] Re: zetron 38a

[rwjohn49]

Thanks for the help.  Need a little more clarification.  I have never 
used one of these before, so I don't want to blow it up.  I have a 
chip that is stackedI suppose this is the one.  I took it apart 
and wouldn't you know it, I managed to turn the chip socket with the 
smaller chip inside around, so I am not sure of its orientation.  It 
has a cut out on the small chip inside the socket.  I suppose this 
marks pin one and I would place the large chip with its dot in 
the same direction.  Now, I have an empty chip space.  What socket 
does it go into... U15 or U16should have marked itdumb. Sorry 
for the bother, but a little bit of orientation will keep me from 
blowing it up...

Thanks

ron




--- In Repeater-Builder@yahoogroups.com, "Maire-Radios"  wrote:
>
> take out the chip with the battery and unplug the chip from the 
battery  give it 3 mins or so and put it back  should default.
> 
> 
>   - Original Message - 
>   From: rwjohn49 
>   To: Repeater-Builder@yahoogroups.com 
>   Sent: Saturday, November 03, 2007 9:11 PM
>   Subject: [Repeater-Builder] zetron 38a
> 
> 
>   Folks,
> 
>   I just got a Zetron 38A at a hamfest. Works fine in the repeater 
but I 
>   have tried the password code and no results. It is listed in the 
book 
>   as 12123#. Someone must have changed it... What do I do now? Can 
it 
>   be set back to a factory default?
> 
>   thanks,
> 
>   ron
>