[Repeater-Builder] dresk trac

[philaprogramming]

Does anyone know if the desktrac has be on a number to repeat.. thanks bob










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Re: [Repeater-Builder] Problems tuning GE Mastr II exciter

[Jeff Otterson]

I have had similar problems.  I suggest you start again, from the very 
beginning.  Retune every stage.  Sometimes there are false peaks, etc.

Then you need to consider the possibility that the exciter is broken.

Did it work before you started tuning?

Jeff

.

At 09:39 AM 1/26/2004, you wrote:
>I am having problems getting my GE Mastr II VHF exciter to tune
>properly. All goes well until I start tuning T110. I have my meter on
>pins 5 (-) and 6 (+) but get no reading at all. I have adjusted T110
>all the way through but still see no reading. When I ground my meter
>to chassis ground I get about 9 volts here. Does anyone have any
>ideas what I might be doing wrong? I am fairly new to repeater
>building and have not seen this problem yet.
>
>Thanks
>
>Jay
>
>
>
>
>
>
>Yahoo! Groups Links
>
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[Repeater-Builder] Phasing harness

[Randy Elliott]

  Greetings to the group

Just wondering if anyone can steer me to a web page for building phasing
harnesses for uhf folded dipole arrays. I'm looking at building a 2 bay and
possibly a 4 bay, and I will need a phasing harness for them.
Thanks in Advance

Randy Elliott VE3JPU




 

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RE: [Repeater-Builder] Z-Matcher Component Values

[Jeff DePolo WN3A]

Tune for best PA efficiency, not maximum output.

--- Jeff

-
Jeff DePolo WN3A
Broadcast and Communications Consultant

> -Original Message-
> From: Tony King - W4ZT [mailto:[EMAIL PROTECTED]
> Sent: Monday, January 26, 2004 9:42 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Z-Matcher Component Values
>
>
> Very nice pictures and good job getting component values for
> the EMR Z-matcher.
>
> One question comes to mind and that is, how are you going to
> adjust it?
> Lacking a built in directional coupler it would appear that
> the only thing
> you could do would be to adjust for maximum transfer of power
> as measured
> on the output of the duplexer. Any thoughts on this subject?
>
> 73,
> Tony W4ZT
>
>
>
>
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/Repeater-> Builder/
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> unsubscribe from this group, send an email to:
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[Repeater-Builder] Re: Z-Matcher Component Values

[skipp025]

Hi Jim,

Probably someone like ATC, which is American 
Technical Ceramics has a similar product. I 
buy from them all the time. You won't like 
the prices. 

I do see piston caps on ebay quite a bit, they 
seem to be cheap enough for the one off project 
builder. 

cheers 

skipp 

www.radiowrench.com 

--- In Repeater-Builder@yahoogroups.com, "Jim Cicirello" <[EMAIL PROTECTED]>
wrote:
> Great JoB!
> Does anyone know a supplier for these capacitors? 
> Thanks again for your efforts, this design is nice.
> 
> 73 JIMKA2AJH





 

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[Repeater-Builder] Re: vhf cellwave

[Derek B. McIntyre]

Describe the antenna a little better.  Is it a coaxial half-wave with 
an adjustable brass "skirt" on the bottom and the whip on the top?  
Sounds like the only thing Celwave would make with a fiberglass 
whip.  If this is the case you will need to adjust the whip and 
skirt, as well as the 75 ohm matching transformer inside the pipe.  
Do you have a pic of the antenna or a drawing?

73, Derek KC4FWC

--- In Repeater-Builder@yahoogroups.com, "Richard Velez" 
<[EMAIL PROTECTED]> wrote:
> I have a VHF cellwave which has a faded label. I cant tell what 
model it is. However the freq stamp was still clear at 154. MHZ. The 
antenna tip has a fiberglass whip. Can I replace that whip to tune 
for 220 MHZ. If so what would be the overall length of the antenna??




 

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[Repeater-Builder] Re: Motorola M120 COR Voltage

[Derek B. McIntyre]

Pins 4, 6, 8 and I think 12 on the M-120 and GM-300 radios are 
programmable for several options.  When in the programming screen, 
under mode options (showing frequency and PL's) I think you can press 
F9 which is "accessory connector" or something to that sort.  This 
will let you select the pins and their functions.

It is most likely that what you are seeing is a COR active LOW.  In 
this state the pin will "float" being that there won't be any voltage 
to measure (such as the 0.023 volts you are seeing) and when an 
active signal opens the squelch, the pin will be held to ground by 
the collector of an NPN transistor inside the radio.

This can be changed to COR active HIGH in the accessory connector 
menu.  This state will mean that the pin is held floating (no 
voltage) when inactive, and 5.0 volts when a signal is present.  The 
5.0 volts is strictly "voltage only" and should only be used to drive 
a super sensitive device, such as the base of a 2N or equivalent, 
or a FET which draws very very little current.

See if this help...
73, Derek KC4FWC


--- In Repeater-Builder@yahoogroups.com, "uplink28" <[EMAIL PROTECTED]> 
wrote:
> When receiving all I get between Pin 8(COR) and Pin 7(GRD) 
> is .023volts(23mv). Is there a way to bring this up? Thanks.




 

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Re: [Repeater-Builder] Z-Matcher Component Values

[Tony King - W4ZT]

Very nice pictures and good job getting component values for the EMR Z-matcher.

One question comes to mind and that is, how are you going to adjust it? 
Lacking a built in directional coupler it would appear that the only thing 
you could do would be to adjust for maximum transfer of power as measured 
on the output of the duplexer. Any thoughts on this subject?

73,
Tony W4ZT




 

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[Repeater-Builder] Problems tuning GE Mastr II exciter

[jay_kruckenberg]

I am having problems getting my GE Mastr II VHF exciter to tune 
properly. All goes well until I start tuning T110. I have my meter on 
pins 5 (-) and 6 (+) but get no reading at all. I have adjusted T110 
all the way through but still see no reading. When I ground my meter 
to chassis ground I get about 9 volts here. Does anyone have any 
ideas what I might be doing wrong? I am fairly new to repeater 
building and have not seen this problem yet.

Thanks

Jay




 

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Re: [Repeater-Builder] Shack clean-up time

[Adam T. Cately]

   What would you ask in cash for the 1/4K low-band base?  I'm not
too far away in Ohio, and we could meet in Indy for pick-up, if an
agreeable price is negotiated...

>GE Mastr II 330 watt Low Band base currently on 47MHz. This unit has what
>is known as the "IDA Control Shelf". It has two additional LB Mastr II
>monitor receivers, also on 47 MHz. Condition is about a 7 out of 10. I have
>a NOS 4CX250 final amp tube I will throw in with this station. I have a 
>complete
>manual for this rig.

   - Adam - 

   

  




 

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Re: [Repeater-Builder] Z Matcher & More

[Micheal Salem]

I tried using one of the MFJ UHF tuners to get more power in a
match with my 80 watt UHF Mirage Repeater Amp.  I had fitted the
Mirage to the Micor to up the power from the 12 watts stock
amp.  I ran the 12 watts into the Mirage, then routed it back
to the Micor Circulator, power output network.

While the tuner did produce more power out of the amp and into
the duplexer, it also arced, so I removed it.  I was running
about 60 watts trying to get the rated 80 watts.

The MFJ also requires the use of insulated tuning tools
apparently using some type of a T network instead of the
pi net.  Probably OK for less power, but not helpful in
my case.

I have found this discussion and the information provided
here very helpful.

Micheal Salem N5MS
Norman, Oklahoma


John J. Riddell wrote:

> Any antenna tuner will work just fine as a Z Matcher such as the various 
> units made by MFJ.
> These even come with meters.
>  
> Building one is really easy but if you're not inclined that way get one 
> of the commercial units
>  
>  
> John J. Riddell,  VE3AMZ
> 451 Cedarcliffe Dr.,
> Waterloo, Ontario, Canada
> N2K 2J1
> 
> 
> 
> 




 

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[Repeater-Builder] Z Matcher & More

[John J. Riddell]

Any antenna tuner will work just fine as a Z 
Matcher such as the various units made by MFJ.
These even come with meters.
 
Building one is really easy but if you're not 
inclined that way get one of the commercial units
 
 
John J. Riddell,  VE3AMZ451 Cedarcliffe 
Dr.,Waterloo, Ontario, CanadaN2K 2J1










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Re: [Repeater-Builder] Z-Matcher Component Values for UHF

[Chuck Kelsey]

Thanks for taking the time and effort to come up with the info. And the
pictures were great!

Chuck
WB2EDV



- Original Message - 
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 25, 2004 9:49 PM
Subject: [Repeater-Builder] Z-Matcher Component Values for UHF


> Chuck,
>
> I'll meet you halfway.  I found a UHF Z-Matcher that I didn't know I
> had, and opened it up.  It's an EMR #6550/Z.
>
> The UHF unit is physically identical to the VHF unit, with the following
> exceptions:  The two variable capacitors are Johanson #5402, rated at 1
> to 14 pF, and the air wound coil is one turn with the same diameter and
> spacing.
>
> I do not have a low-band VHF unit to examine, but given the trend, I
> would suggest starting with two Johanson #5602 capacitors 1 to 30 pF and
> a coil with six turns.  A little experimentation wouldn't hurt...
>
> 73, Eric Lemmon WB6FLY
>
>





 

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[Repeater-Builder] Z-Matcher Component Values for UHF

[Eric Lemmon]

Chuck,

I'll meet you halfway.  I found a UHF Z-Matcher that I didn't know I
had, and opened it up.  It's an EMR #6550/Z.

The UHF unit is physically identical to the VHF unit, with the following
exceptions:  The two variable capacitors are Johanson #5402, rated at 1
to 14 pF, and the air wound coil is one turn with the same diameter and
spacing.

I do not have a low-band VHF unit to examine, but given the trend, I
would suggest starting with two Johanson #5602 capacitors 1 to 30 pF and
a coil with six turns.  A little experimentation wouldn't hurt...

73, Eric Lemmon WB6FLY

Chuck Kelsey wrote:
> 
> Not wanting to sound like "looking a gift horse in the mouth" what about 6
> meters and 440?
> 
> The GE versions for 2 and 440 look good, but I also like the idea of a self
> contained version that just adds on at the antenna port.
> 
> Chuck
> WB2EDV
> 
> - Original Message -
> From: "Eric Lemmon" <[EMAIL PROTECTED]>
> To: 
> Sent: Sunday, January 25, 2004 8:00 PM
> Subject: [Repeater-Builder] Z-Matcher Component Values
> 
> > With some help from Bill Lieske of EMR, I now have the information about
> > the EMR #6450/Z VHF Impedance Matcher.
> >
> > The unit comprises a simple pi network inside a 1" by 1" by 1.25"
> > shielded box, with a male N on one end and a female N on the other.  The
> > unit is symmetrical, so it makes no difference how it is connected.
> >
> > A Johanson #5502 piston-type variable capacitor, 1 to 20 pF, is
> > installed right at each connector, with an air-wound coil between them.
> > The coil is #18 bare copper wire, and is three turns having an inside
> > diameter of 3/16", spread out so that there is 1/16" of space between
> > each turn.  Although I've never had to do this, the coil can be squeezed
> > or stretched a bit if either or both capacitors run out of adjustment
> > before a match is achieved.  The specified capacitors are MIL-SPEC
> > components, being designated as #PC31J200 in MIL-C-14409.  The
> > manufacturer's data sheet for this capacitor can be found at:
> > 
> >
> > 73, Eric Lemmon WB6FLY
> >
> >
> 
> 
> 
> Yahoo! Groups Links
> 
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Re: [Repeater-Builder] circulators

[Johnny]

I know what you are saying. I picked up 3 from this guy a few weeks ago.
Johnny


Russ Stafford wrote:
> We use them on EVERY transmitter in our system!
> Some tower owners require them.
> It is a great idea to use a circulator it solves many problems before they
> are a problem.
> 73 Russ, W3CH
> Trustee, W3PS
> Metro-Comm repeater
> network.
> 
> 
> - Original Message -
> From: "Johnny" <[EMAIL PROTECTED]>
> To: 
> Sent: Sunday, January 25, 2004 3:10 PM
> Subject: [Repeater-Builder] circulators
> 
> 
> 
>>
>>There was some discussion on the list awhile back about circulators.
>>I ran across this in my surfing.
>>
>>
> 
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3073999106&category=1502
> 
>>
>>
>>
>>
>>
>>Yahoo! Groups Links
>>
>>To visit your group on the web, go to:
>> http://groups.yahoo.com/group/Repeater-Builder/
>>
>>To unsubscribe from this group, send an email to:
>> [EMAIL PROTECTED]
>>
>>Your use of Yahoo! Groups is subject to:
>> http://docs.yahoo.com/info/terms/
>>
>>
>>
> 
> 
> 
> 
> 
>  
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go to:
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> 
> 
> 





 

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Re: [Repeater-Builder] circulators

[Russ Stafford]

We use them on EVERY transmitter in our system!
Some tower owners require them.
It is a great idea to use a circulator it solves many problems before they
are a problem.
73 Russ, W3CH
Trustee, W3PS
Metro-Comm repeater
network.


- Original Message -
From: "Johnny" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 25, 2004 3:10 PM
Subject: [Repeater-Builder] circulators


>
>
> There was some discussion on the list awhile back about circulators.
> I ran across this in my surfing.
>
>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3073999106&category=1502
>
>
>
>
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
>  http://groups.yahoo.com/group/Repeater-Builder/
>
> To unsubscribe from this group, send an email to:
>  [EMAIL PROTECTED]
>
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>
>
>




 

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Re: [Repeater-Builder] Z-Matcher Component Values

[Chuck Kelsey]

Not wanting to sound like "looking a gift horse in the mouth" what about 6
meters and 440?

The GE versions for 2 and 440 look good, but I also like the idea of a self
contained version that just adds on at the antenna port.

Chuck
WB2EDV



- Original Message - 
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 25, 2004 8:00 PM
Subject: [Repeater-Builder] Z-Matcher Component Values


> With some help from Bill Lieske of EMR, I now have the information about
> the EMR #6450/Z VHF Impedance Matcher.
>
> The unit comprises a simple pi network inside a 1" by 1" by 1.25"
> shielded box, with a male N on one end and a female N on the other.  The
> unit is symmetrical, so it makes no difference how it is connected.
>
> A Johanson #5502 piston-type variable capacitor, 1 to 20 pF, is
> installed right at each connector, with an air-wound coil between them.
> The coil is #18 bare copper wire, and is three turns having an inside
> diameter of 3/16", spread out so that there is 1/16" of space between
> each turn.  Although I've never had to do this, the coil can be squeezed
> or stretched a bit if either or both capacitors run out of adjustment
> before a match is achieved.  The specified capacitors are MIL-SPEC
> components, being designated as #PC31J200 in MIL-C-14409.  The
> manufacturer's data sheet for this capacitor can be found at:
> 
>
> 73, Eric Lemmon WB6FLY
>
>





 

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[Repeater-Builder] Z-Matcher Component Values

[Eric Lemmon]

With some help from Bill Lieske of EMR, I now have the information about
the EMR #6450/Z VHF Impedance Matcher.

The unit comprises a simple pi network inside a 1" by 1" by 1.25"
shielded box, with a male N on one end and a female N on the other.  The
unit is symmetrical, so it makes no difference how it is connected.

A Johanson #5502 piston-type variable capacitor, 1 to 20 pF, is
installed right at each connector, with an air-wound coil between them. 
The coil is #18 bare copper wire, and is three turns having an inside
diameter of 3/16", spread out so that there is 1/16" of space between
each turn.  Although I've never had to do this, the coil can be squeezed
or stretched a bit if either or both capacitors run out of adjustment
before a match is achieved.  The specified capacitors are MIL-SPEC
components, being designated as #PC31J200 in MIL-C-14409.  The
manufacturer's data sheet for this capacitor can be found at:


73, Eric Lemmon WB6FLY



 

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[Repeater-Builder] Mark 4-CR

[Ralph Mowery]

I have not had any dealing with the MRF-137 mosfet that is in that repeater.
A friend of mine in another city has one and the power out is low (about
half or 15 watts) .  Can a power mosfet  fail similar to an rf power
transistor that has many emitter leads and some of them burn open and you
get reduced power out ?





 

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