Re: [Repeater-Builder] Direction of a signal through a repeater system.

[Rick Parrish]

Nate Duehr wrote:
> - More than one alert monitor and/or the mountain going off, it's likely 
> airborne (and since we can listen to the audio from our monitors, you 
> can listen to it fly off into the sunset, decreasing in signal strength 
> everywhere... you can also usually tell what general direction it was 
> going).
Oh joy ... that actually happened to me once. The turbulence wasn't even 
that bad. The worst part is these transmitters are usually mounted in 
the tail cone - not exactly easy to get to while you're flying the plane. 

-rick

Re: Re: [Repeater-Builder] GE 100 watt PA final transistors

[Ron Wright]

Scott,

Have you got any Exec IIs you want to part with???

73, ron, n9ee/r



>From: Scott Zimmerman <[EMAIL PROTECTED]>
>Date: 2007/07/23 Mon PM 02:31:29 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] GE 100 watt PA final transistors

>Randy,
>
>Since you have been struggling with this for a while now, tell me what style 
>VHF PA you currently have (the 3 or 4 transistor final) and I can sell you a 
>complete VHF 110W PA known working for MUCH, MUCH cheaper than that. Then 
>all you have to do is some transplanting.
>
>Scott
>
>Scott Zimmerman
>Amateur Radio Call N3XCC
>612 Barnett Rd
>Boswell, PA 15531
>
>- Original Message - 
>From: "R. K. Brumback" <[EMAIL PROTECTED]>
>To: 
>Sent: Monday, July 23, 2007 2:38 PM
>Subject: [Repeater-Builder] GE 100 watt PA final transistors
>
>
>>
>> I just got a quote back from Digitron Electronics on the MRF-247 final
>> transistors for the VHF Mastr II. They want $80.00 EACH!!  OUCH  I
>> nearly crapped in the chair. They had about 5,000 of them and I would say
>> that is the reason they have so many.
>> Randy
>> KI4BQN
>>
>>
>>
>> No virus found in this outgoing message.
>> Checked by AVG Free Edition.
>> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
>> 7:02 PM
>>
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>> -- 
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 
>> 7:02 PM
>>
>> 
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.

Re: RE: [Repeater-Builder] GE 100 watt PA final transistors

[Ron Wright]

Randy,

Your obstervations are correct.  GE simply added more boards/transistors to 
increase power from 35 to 60 to 110 watt.  If you look in say a 60 watt most of 
the PA compartment is open with a coax going from the last board to the filter.

Most often simply changing a board is easier than changing the transistor.  
Changing the whole PA is also simple.  When new it was probably expensive, but 
today cheap and there are lots of Mastr IIs around.  Some repeater owners buy 
rigs for spares.  Might consider it for your group.

73, ron, n9ee/r




>From: "R. K. Brumback" <[EMAIL PROTECTED]>
>Date: 2007/07/23 Mon PM 05:54:36 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: RE: [Repeater-Builder] GE 100 watt PA final transistors

>Scott,
>From an amateur approach this is how I would describe it. I am just now
>learning about Mastr IIs. The PA appears to be in 3 stages and can be
>separated physically into 3 different boards. The first board has 2
>transistors (4340P1 & 4340P2). The first board appears to drive the second
>board which has one power transistor (4304P4). At the end of the second
>board I can get 50 watts output power so I figured everything was good to
>there. The 3rd board has two power transistors that appear to be in
>parallel. From there it goes into what appears to be a matching network and
>then on out to coax. The number on the board is PL19D424266G1 Rev B. From
>what I understand about any 110 watt board will interchange even is the
>configuration is different. Contact me personally at this email if you wish
>and many thanks. [EMAIL PROTECTED]
>Randy
>W4CPT
>
>
>-Original Message-
>From: Repeater-Builder@yahoogroups.com
>[mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman
>Sent: Monday, July 23, 2007 3:31 PM
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] GE 100 watt PA final transistors
>
>Randy,
>
>Since you have been struggling with this for a while now, tell me what style
>
>VHF PA you currently have (the 3 or 4 transistor final) and I can sell you a
>
>complete VHF 110W PA known working for MUCH, MUCH cheaper than that. Then 
>all you have to do is some transplanting.
>
>Scott
>
>Scott Zimmerman
>Amateur Radio Call N3XCC
>612 Barnett Rd
>Boswell, PA 15531
>
>- Original Message - 
>From: "R. K. Brumback" <[EMAIL PROTECTED]>
>To: 
>Sent: Monday, July 23, 2007 2:38 PM
>Subject: [Repeater-Builder] GE 100 watt PA final transistors
>
>
>>
>> I just got a quote back from Digitron Electronics on the MRF-247 final
>> transistors for the VHF Mastr II. They want $80.00 EACH!!  OUCH  I
>> nearly crapped in the chair. They had about 5,000 of them and I would say
>> that is the reason they have so many.
>> Randy
>> KI4BQN
>>
>>
>>
>> No virus found in this outgoing message.
>> Checked by AVG Free Edition.
>> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
>> 7:02 PM
>>
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>> -- 
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
>
>> 7:02 PM
>>
>> 
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
>
>No virus found in this incoming message.
>Checked by AVG Free Edition. 
>Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
>7:02 PM
> 
>
>No virus found in this outgoing message.
>Checked by AVG Free Edition. 
>Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
>7:02 PM
> 
>
>
>
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>
> 
>Yahoo! Groups Links
>
>
>


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.

Re: [Repeater-Builder] Direction of a signal through a repeater system.

[Nate Duehr]

Kris Kirby wrote:
> On Sun, 22 Jul 2007, skipp025 wrote:
>> Don't know how practical it would be... but (some) rotating dopplers 
>> make a tone that can pass through a linked radio system. If the 
>> antenna array reference was known you might be able to get a general 
>> direction back to x-desired location. s.
> 
> If you use a diode-switched doppler system, the sidetone becomes 
> component of the signal, which one could detect on and correlate to a 
> particular direction. That tone, however, is related to antenna 
> switching speed, not direction. One could easily rig something to a 
> fixed dopper direction finder to generate a particular frequency based 
> on which antenna is selected and provideo an audible output that could 
> be directed to a repeater. 

The problem with such systems is the real-estate necessary at the 
repeater site for them.

The group here found many years ago that it was easier to get small 
places to put individual receivers directly at the airports, with single 
antennas (well, actually they have a 121.5 antenna and a UHF 1/4 wave to 
send alerts out to the repeater) than it would ever be to pay for enough 
antenna space at a repeater site for rotatable or electronically 
switched antenna solutions with multiple antennas.

In fact, you typically don't have to pay for them at all, and they'll 
throw in the small amount of AC power you draw for free... unlike a 
commercial communications site!

If you're hanging around aviation, there's always someone you know with 
a hangar that has power, and will let you put two tiny antennas on the 
roof, and run those to a locked NEMA box inside with your gadgets.  And 
in many cases the FBO themselves and/or the Airport Authority were happy 
to provide a spot.

We then augment the airport-based systems with one receiver way up high 
at the repeater site.

It leads to things like this:

- One alert monitor going off, it's probably at that airport.  Someone 
drives there and DF's it, since you already know where you CAN hear 
it... the hard part's done for you.

- One alert monitor going off, and the mountaintop receiver, it's 
probably at that airport and stronger.  (GRIN)

- More than one alert monitor and/or the mountain going off, it's likely 
airborne (and since we can listen to the audio from our monitors, you 
can listen to it fly off into the sunset, decreasing in signal strength 
everywhere... you can also usually tell what general direction it was 
going).

- Only the mountaintop receiver hearing it... that's the most likely 
time it could be "real"... or just at an airport we don't have covered 
yet.  (GRIN)

Anyway, as soon as any of them are determined to be non-emergency, we 
command the remote receivers and the mountaintop one to OFF, since 
retransmission of the 121.5 or 243.0 signals into Part 97 territory is a 
no-no unless it's an emergency.  Every ELT starts out an "emergency" and 
gets downgraded from there... (GRIN).

There's some other nifty features that the ham building/designing the 
airport monitors has done with them over the years, too many to mention 
really... but some of them are:

Anything "commandable" is handled via DTMF through the repeater and down 
to the little controllers at the airports.

- Voice alerts along with DTMF alerts, where the DTMF alert can be 
decoded elsewhere, allowing for an amazing array of features, driven by 
a computer somewhere "else".  Currently used for logging and e-mail 
alerts/pages.

- CW ID's (of course)

- Signal strength (RSSI) announcements during alerts.

- The ability to do various things including listen to 121.5, or 243.0, 
turn on/off alerts for any band.

- Measure and annouce AC input voltage and DC/battery backup voltage.

- Alert on door opening of the NEMA boxes (tampering) and/or check on 
the door closure switch status.

Etc etc etc... the list goes on.  It's basically been a decade-long 
project for him, with various new releases of his controller and 
controller's code for doing all of the above and more.  He's not 
interested in selling/supporting them outside our environment, however. 
  In our environment he has complete control over the radios used, etc. 
  Building a few of something you know is easy, building a "product" is 
a lot harder.

You can see the daily alerts (that DTMF during alerts thing again) at 
the website, http://www.fredf.org on the left sidebar.

Pick yesterday to see an ELT around 3AM at 2V2 (actually 2V2 may have 
changed identifiers recently, some changes needed in code...) and APA at 
around 11 AM.

Pick July 19th to see one that flew into the Denver Metro area, and 
landed at APA.  Heh... see how only the mountain (labeled "Repeater") 
only heard it until it landed?

And the 18th of July for the one I hunted down over at Adam Aircraft at 
APA.  It was in one of the brandy-new VLJ's under construction, the bird 
didn't even have a paint job on it.

I LOVE it when those guys set one off, you get to see the new/pretty 
birds up 

RE: [Repeater-Builder] GE 100 watt PA final transistors

[R. K. Brumback]

Scott,
>From an amateur approach this is how I would describe it. I am just now
learning about Mastr IIs. The PA appears to be in 3 stages and can be
separated physically into 3 different boards. The first board has 2
transistors (4340P1 & 4340P2). The first board appears to drive the second
board which has one power transistor (4304P4). At the end of the second
board I can get 50 watts output power so I figured everything was good to
there. The 3rd board has two power transistors that appear to be in
parallel. From there it goes into what appears to be a matching network and
then on out to coax. The number on the board is PL19D424266G1 Rev B. From
what I understand about any 110 watt board will interchange even is the
configuration is different. Contact me personally at this email if you wish
and many thanks. [EMAIL PROTECTED]
Randy
W4CPT


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman
Sent: Monday, July 23, 2007 3:31 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GE 100 watt PA final transistors

Randy,

Since you have been struggling with this for a while now, tell me what style

VHF PA you currently have (the 3 or 4 transistor final) and I can sell you a

complete VHF 110W PA known working for MUCH, MUCH cheaper than that. Then 
all you have to do is some transplanting.

Scott

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

- Original Message - 
From: "R. K. Brumback" <[EMAIL PROTECTED]>
To: 
Sent: Monday, July 23, 2007 2:38 PM
Subject: [Repeater-Builder] GE 100 watt PA final transistors


>
> I just got a quote back from Digitron Electronics on the MRF-247 final
> transistors for the VHF Mastr II. They want $80.00 EACH!!  OUCH  I
> nearly crapped in the chair. They had about 5,000 of them and I would say
> that is the reason they have so many.
> Randy
> KI4BQN
>
>
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
> 7:02 PM
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007

> 7:02 PM
>
> 





 
Yahoo! Groups Links




No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
7:02 PM
 

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Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
7:02 PM
 





 
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Re: [Repeater-Builder] Re: Recommendation - Vane Switch

[Mike Morris]

At 09:14 AM 07/23/07, you wrote:

>Many vane indicators are of the long arm micro switch type. Easy
>enough to make your own but you can probably find them through
>companies like McMaster, C&H Sales Company, Grainger (all in
>Southern California) and many Heating & Air Conditioning Supply
>Stores.
>
>A number of possible microswitches can easily be adapted to
>airflow vane switch applications.  C&H Sales sells or sold a lot
>of long arm units and numbers like the MICRO YZ-2RL come to mind
>as a possible option.

C & H Sales  AKA C & H Surplus is effectively no more.

The owner has medical problems, and has decided to retire.  After
about a year of looking nobody wanted to buy the operation, so he
has stopped buying, has slowly emptied the warehouse through the
store, has sold the warehouse, and the store contents are selling.
As of a week ago last friday the store is over 60% empty.

Mike WA6ILQ

Re: [Repeater-Builder] GE 100 watt PA final transistors

[Scott Zimmerman]

Randy,

Since you have been struggling with this for a while now, tell me what style 
VHF PA you currently have (the 3 or 4 transistor final) and I can sell you a 
complete VHF 110W PA known working for MUCH, MUCH cheaper than that. Then 
all you have to do is some transplanting.

Scott

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

- Original Message - 
From: "R. K. Brumback" <[EMAIL PROTECTED]>
To: 
Sent: Monday, July 23, 2007 2:38 PM
Subject: [Repeater-Builder] GE 100 watt PA final transistors


>
> I just got a quote back from Digitron Electronics on the MRF-247 final
> transistors for the VHF Mastr II. They want $80.00 EACH!!  OUCH  I
> nearly crapped in the chair. They had about 5,000 of them and I would say
> that is the reason they have so many.
> Randy
> KI4BQN
>
>
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007
> 7:02 PM
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 
> 7:02 PM
>
> 





 
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RE: [Repeater-Builder] Re: Recommendation - Vane Switch

[Bob M.]

I looked at the Quantar/Quantro diagram for their
100/125w PAs. They have one or two fans in them. The
current is sensed as a voltage drop across a pair of
9.1 ohm resistors in the ground lead. This feeds two
op-amps/comparators. If the current is too low or too
high, either comparator output goes high and turns on
a transistor through a diode OR gate. This feeds a mux
chip along with a thermistor that senses PA
temperature. The control module queries the mux chip
and decides if the PA fans are working or not and/or
if the PA is getting too hot. More details on request.

Of course this doesn't necessarily tell you if the
fans have failed yet are still drawing the same amount
of current.

If you have any kind of plenum setup, you can buy a
small pressure sensor from Jameco and try to monitor
the positive air pressure. It's better than nothing at
all. You still may have to manipulate the output
signal, and if the fans aren't on 100% of the time,
you may want to gate the pressure signal with a "fan
on" signal so you don't get a false failure when the
fans aren't running.

Bob M.
==
--- "Adam C. Feuer" <[EMAIL PROTECTED]> wrote:

> Thanks guys for the interesting thoughts.  All 6 of
> the PA's are 
> solid state. They are the Quintron / Glenayre 90
> watters.
> 
> 
> At 12:46 PM 7/23/2007, you wrote:
> >
> > > If the blower is used to cool a tube pa the
> thermostat detection
> > > hardware is probably way to slow.
> >
> >I was assuming a SS PA, but maybe that was a
> mis-assumption.
> >
> > > Many vane indicators are of the long arm micro
> switch type. Easy
> > > enough to make your own but you can probably
> find them through
> > > companies like McMaster, C&H Sales Company,
> Grainger (all in
> > > Southern California) and many Heating & Air
> Conditioning Supply
> > > Stores.
> >
> >I hate vane switches, having seen way too many
> failures over the years.
> >Vanes breaking off, microswitches getting stuck due
> to all of the gunk that
> >accumulates, etc.  Good transmitters use
> differential pressure sensors to
> >measure the difference between the two halves of
> the tube compartment.  Too
> >much differential and you've got a blockage in the
> tube fins or socket.  Not
> >enough differential and either the blower isn't
> running, the intake filter
> >is clogged, or the chimney is blocked.  I always
> monitor stack temperature
> >too as a backup.
> >
> >For a SS PA, I still think a thermostat is the most
> reliable.
> >
> >I had a 5kW watt FM transmitter that somebody
> bypassed the air interlocks
> >on.  The squirrel cage blower lost a blade and
> jammed up.  Looked like a
> >miniature version of Cheryobyl in there after all
> was said and done...and
> >off to the scrap yard it went (it was 30 years old
> and due for retirement
> >anyway).
> >
> > --- Jeff


   

Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for 
today's economy) at Yahoo! Games.
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[Repeater-Builder] GE 100 watt PA final transistors

[R. K. Brumback]

I just got a quote back from Digitron Electronics on the MRF-247 final
transistors for the VHF Mastr II. They want $80.00 EACH!!  OUCH  I
nearly crapped in the chair. They had about 5,000 of them and I would say
that is the reason they have so many.
Randy
KI4BQN



No virus found in this outgoing message.
Checked by AVG Free Edition. 
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7:02 PM
 





 
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RE: [Repeater-Builder] Re: Recommendation - Vane Switch

[Adam C. Feuer]

Thanks guys for the interesting thoughts.  All 6 of the PA's are 
solid state. They are the Quintron / Glenayre 90 watters.


At 12:46 PM 7/23/2007, you wrote:
>
> > If the blower is used to cool a tube pa the thermostat detection
> > hardware is probably way to slow.
>
>I was assuming a SS PA, but maybe that was a mis-assumption.
>
> > Many vane indicators are of the long arm micro switch type. Easy
> > enough to make your own but you can probably find them through
> > companies like McMaster, C&H Sales Company, Grainger (all in
> > Southern California) and many Heating & Air Conditioning Supply
> > Stores.
>
>I hate vane switches, having seen way too many failures over the years.
>Vanes breaking off, microswitches getting stuck due to all of the gunk that
>accumulates, etc.  Good transmitters use differential pressure sensors to
>measure the difference between the two halves of the tube compartment.  Too
>much differential and you've got a blockage in the tube fins or socket.  Not
>enough differential and either the blower isn't running, the intake filter
>is clogged, or the chimney is blocked.  I always monitor stack temperature
>too as a backup.
>
>For a SS PA, I still think a thermostat is the most reliable.
>
>I had a 5kW watt FM transmitter that somebody bypassed the air interlocks
>on.  The squirrel cage blower lost a blade and jammed up.  Looked like a
>miniature version of Cheryobyl in there after all was said and done...and
>off to the scrap yard it went (it was 30 years old and due for retirement
>anyway).
>
> --- Jeff
>
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 
>7/22/2007 7:02 PM

RE: [Repeater-Builder] Re: Recommendation - Vane Switch

[Jeff DePolo]

 
> If the blower is used to cool a tube pa the thermostat detection 
> hardware is probably way to slow. 

I was assuming a SS PA, but maybe that was a mis-assumption.

> Many vane indicators are of the long arm micro switch type. Easy 
> enough to make your own but you can probably find them through 
> companies like McMaster, C&H Sales Company, Grainger (all in 
> Southern California) and many Heating & Air Conditioning Supply 
> Stores. 

I hate vane switches, having seen way too many failures over the years.
Vanes breaking off, microswitches getting stuck due to all of the gunk that
accumulates, etc.  Good transmitters use differential pressure sensors to
measure the difference between the two halves of the tube compartment.  Too
much differential and you've got a blockage in the tube fins or socket.  Not
enough differential and either the blower isn't running, the intake filter
is clogged, or the chimney is blocked.  I always monitor stack temperature
too as a backup.

For a SS PA, I still think a thermostat is the most reliable.

I had a 5kW watt FM transmitter that somebody bypassed the air interlocks
on.  The squirrel cage blower lost a blade and jammed up.  Looked like a
miniature version of Cheryobyl in there after all was said and done...and
off to the scrap yard it went (it was 30 years old and due for retirement
anyway).

--- Jeff

[Repeater-Builder] Re: Recommendation - Vane Switch

[skipp025]

> Rather than having to add on an airflow sensor of some ilk, 
> there are two other options that might be easier:
> 
> 1.  Use fans that have a fail indication lead.  Most fans, 
> specially the PC variety, have a third wire that is used as 
> a tachometer.  Most give two squarewave pulses per rotation. 

Might not help if the blower cage or fan blade assembly falls off 
or becomes disabled along with the air flow (path) failing to 
reach the target. Unless the motor monitor circuit is smart enough 
to catch overspeed or high/low current the motor will keep going 
while the circuit heats up. 

> 2.  Rather than relying on detection of the fan rotation/airflow, 
> why not use a thermostat instead (Klixon variety).  That way you 
> know if your PA is actually in the danger zone due to either a 
> fan failure or site HVAC failure or other condition that causes 
> the temperature to go above the limit.

If the blower is used to cool a tube pa the thermostat detection 
hardware is probably way to slow. By the time the temp has 
triggered the thermostat the tube and/or adjacent circuitry might 
have already gone way past a reasonable high or max temp. Might 
be alright if the pa is solid state even though I'd try to keep 
the thermal cycle values under control with an earlier start blower 
system. 

Many vane indicators are of the long arm micro switch type. Easy 
enough to make your own but you can probably find them through 
companies like McMaster, C&H Sales Company, Grainger (all in 
Southern California) and many Heating & Air Conditioning Supply 
Stores. 

A number of possible microswitches can easily be adapted to 
airflow vane switch applications.  C&H Sales sells or sold a lot 
of long arm units and numbers like the MICRO YZ-2RL come to mind
as a possible option.  

If you want to get creative with a valid switch interlock the 
Cheery E20 110P1157-D is a cute switch to think about. 

cheers, 
s. 

> > I'm looking for information from anyone who has experience and 
> > could recommend a good vane switch to be installed on several 
> > repeaters. Some of my machines are 2 1/2 hours from my house 
> > so visiting them often just doesn't happen.
> > 
> > I would like to install a vane switch to monitor the PA Fan and 
> > connect the output of the switch into the sites SCADA system.
> > 
> > Manufacturer, model #, price, and opinion would be greatly 
> > appreciated.

Re: [Repeater-Builder] looking for parts

[Steve Allred]

Larry,
  Did you get my last message?
  Steve / K6SCA

ke7hgc <[EMAIL PROTECTED]> wrote:
  Good evening all, I'm looking for a set of 4 cavities for 6 meters 
for 
a project anyone got a set in their way? thanks,Larry/ke7hgc



 

   
-
Luggage? GPS? Comic books? 
Check out fitting  gifts for grads at Yahoo! Search.

RE: [Repeater-Builder] Recommendation - Vane Switch

[Jeff DePolo]

Rather than having to add on an airflow sensor of some ilk, there are two
other options that might be easier:

1.  Use fans that have a fail indication lead.  Most fans, especially the PC
variety, have a third wire that is used as a tachometer.  Most give two
squarewave pulses per rotation.  If your SCADA system can deal with that,
great.  If not, a simple RC circuit used as an integrator, perhaps in
conjunction with a comparator, would be simple enough to build.  Aside from
the tachometer types, there are other fans with locked-rotor indicators
instead of the tach, and others that have a low-speed warning indicator.  If
you do a few searches, you can probably find a fan with the appropriate
status output(s) to do whatever you want.

2.  Rather than relying on detection of the fan rotation/airflow, why not
use a thermostat instead (Klixon variety).  That way you know if your PA is
actually in the danger zone due to either a fan failure or site HVAC failure
or other condition that causes the temperature to go above the limit.

--- Jeff
 

> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:[EMAIL PROTECTED] On Behalf Of Adam C. Feuer
> Sent: Monday, July 23, 2007 11:21 AM
> To: repeater-builder@yahoogroups.com
> Subject: [Repeater-Builder] Recommendation - Vane Switch
> 
> Hello All,
> 
> I'm looking for information from anyone who has experience and could 
> recommend a good vane switch to be installed on several repeaters. 
> Some of my machines are 2 1/2 hours from my house so visiting them 
> often just doesn't happen.
> 
> I would like to install a vane switch to monitor the PA Fan and 
> connect the output of the switch into the sites SCADA system.
> 
> Manufacturer, model #, price, and opinion would be greatly 
> appreciated.
> 
> Thanks!
> 
> Adam N2ACF
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG Free Edition. 
> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release 
> Date: 7/22/2007 7:02 PM
>  
> 

[Repeater-Builder] Recommendation - Vane Switch

[Adam C. Feuer]

Hello All,

I'm looking for information from anyone who has experience and could 
recommend a good vane switch to be installed on several repeaters. 
Some of my machines are 2 1/2 hours from my house so visiting them 
often just doesn't happen.

I would like to install a vane switch to monitor the PA Fan and 
connect the output of the switch into the sites SCADA system.

Manufacturer, model #, price, and opinion would be greatly appreciated.

Thanks!

Adam N2ACF

[Repeater-Builder] Re:450-470 Antenna for sale/trade

[Greg Beat]

RFS Celwave now sells the Sationamster II antenna.
Here is a catalog page fo the various models
http://www2.rfsworld.com/RFS_Edition3/pdfs/BSA_Omni_201-204.pdf

The 2 most common connectors are used for the Stationmaster were:
N Female
7-16 DIN female

gb

[Repeater-Builder] My Repeater

[mung_bungholio]

I got my duplexers in today and everything seems to be running OK.

One of the next things I need to do is get Echolink running from the 
controller instead of a radio linked into the repeater.

Does anyone know the best way to wire the PC into an R1000V repeater?

One other issue I am having is getting the voice ID to work.  No matter 
what I do it doesn't seem to be working.  I guess it's not a huge deal 
since I can do the voice ID through echolink though.

Thanks,
Vern
KI4ONW

Re: RE: [Repeater-Builder] Re: old Motorola

[Ron Wright]

Is this one of the tan colored desk top rigs with a motrac for the radio???  

In the motrac, as many know, the tubes are inside the heat sink housing.  Those 
motracs were built, really built, but had tubes.  For the times it was the 
best.  

Great receiver.  I have 4 of the motrac receivers mounted for base use in 19" 
panel with AC supply.  About the only motrac stuff I kept.

73, ron, n9ee/r



>From: Eric Lemmon <[EMAIL PROTECTED]>
>Date: 2007/07/22 Sun PM 08:14:22 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: RE: [Repeater-Builder] Re: old Motorola

>  
>I did a little more digging, and found some additional information.  The
>C71LHB-3400C station was equipped with a single receiver with "extender"
>capability, and had one RX and one TX frequency.  It was intended to be used
>with 20 kHz channel spacing.  The exact split within the 30-50 MHz band is
>determined by examination of the receiver and transmitter:
>
>The TRB1451AF receiver was for 25-30 MHz, the TRB1452AF receiver was for
>30-36 MHz, the TRB1453AF receiver was for 36-42 MHz, and the TRB1454AF
>receiver was for 42-50 MHz.
>
>The TTB1251AA transmitter was for 25-30 MHz, the 2AA was for 30-36 MHz, the
>3AA was for 36-42 MHz, and the 4AA was for 42-50 MHz.
>
>The transmitter uses a TLN6824AA Vibrasender, and the receiver uses a
>TLN8381A Vibrasponder.
>
>The receive channel element is a TLN1081A rated at 5 PPM.  The transmitter
>can use either a TLN1082A element for 5 PPM, or a TLN1087A element for 2
>PPM.
>
>73, Eric Lemmon WB6FLY
>
>-Original Message-
>From: Repeater-Builder@yahoogroups.com
>[mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon
>Sent: Sunday, July 22, 2007 9:28 AM
>To: Repeater-Builder@yahoogroups.com
>Subject: RE: [Repeater-Builder] Re: old Motorola
>
>Rich,
>
>A C71LHB-3400C is a Compa-Station Base Radio for 25-50 MHz, 100 watts,
>Private-Line, and DC remote control. The manual that covers it is
>6881005E40, which is no longer in print. I am assuming that the model
>number tag actually represents the equipment inside.
>
>FYI, the C71LHB-3400C radio does have tubes in the transmitter. The V101
>driver is a 7551 pentode, while the V102 final power amplifier is either a
>5894 or a 8643 dual tetrode. Although some of the innards may resemble
>Micor or Motran mobile chassis, the subject station was simply known as a
>"Compa-Station." This station was normally in a THN6062A cabinet, which was
>22 inches wide, 8 inches deep, and 30.25 inches high.
>
>73, Eric Lemmon WB6FLY
>
>-Original Message-
>From: Repeater-Builder@yahoogroups.com
> 
>[mailto:Repeater-Builder@yahoogroups.com
> ] On Behalf Of Rich
>Sent: Sunday, July 22, 2007 7:13 AM
>To: Repeater-Builder@yahoogroups.com
> 
>Subject: [Repeater-Builder] Re: old Motorola
>
>C71 LHB 3400 C 
>
>I took a picture of it but can't post it.
>
>


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.