Re: [Repeater-Builder] static buster

[Kevin Custer]

For commercial antennas that have a brass cap or rod sticking out the 
top of the antenna, you simply drill and tap for 4-40 threads and thread 
the SB into the hole.
I really need to take a more current photo and place it on the site.  
The current SB has a shorter threaded stud and is all black in color.

Here is detailed mounting instructions:


Kevin

skipp025 wrote:

>Kevin, 
>
>Would it be possible to ask you to describe how 
>the Static Buster mounts to the antenna and or 
>antenna tower?  
>
>thanks
>skipp 
>





 
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Re: [Repeater-Builder] GM300 TX Calibration

[Steven Passmore]

I wouldn't mind if you keep it on the list.  Sounds like good information. 
I looked through motorola.ca myself and couldn't find anything other than 
some marketing pages in both english and french.

Steve P.

- Original Message - 
From: "Richard W. Solomon" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 10, 2005 2:17 PM
Subject: RE: [Repeater-Builder] GM300 TX Calibration


>
> Where on the site is it ? I couldn't find it.
>
> 73, Dick, W1KSZ
>
> -Original Message-
> From: Warren Beaule [mailto:[EMAIL PROTECTED]
> Sent: Monday, January 10, 2005 2:51 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] GM300 TX Calibration
>
>
>
>
> It is all available free from motorola Canada in
> downloadable format   Regards  Warren VA5WDB
> --- wn1b8 <[EMAIL PROTECTED]> wrote:
>>
>>
>> Greetings,
>>
>> Is there anyone on the list that has an
>> understanding of the soft
>> calibration procedures for the M120/GM300 radios
>> that would be
>> willing to help me? I'd prefer off list to as to not
>> take up list
>> bandwidth.
>>
>> Thanks,
>>
>> Scott Madison, WN1B
>>
>>
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>> [EMAIL PROTECTED]
>>
>>
>>
>>
>>
>>
>
> __
> Post your free ad now! http://personals.yahoo.ca
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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RE: [Repeater-Builder] GM300 TX Calibration

[Richard W. Solomon]

Where on the site is it ? I couldn't find it.

73, Dick, W1KSZ 

-Original Message-
From: Warren Beaule [mailto:[EMAIL PROTECTED]
Sent: Monday, January 10, 2005 2:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 TX Calibration




It is all available free from motorola Canada in
downloadable format   Regards  Warren VA5WDB
 --- wn1b8 <[EMAIL PROTECTED]> wrote: 
> 
> 
> Greetings,
> 
> Is there anyone on the list that has an
> understanding of the soft 
> calibration procedures for the M120/GM300 radios
> that would be 
> willing to help me? I'd prefer off list to as to not
> take up list 
> bandwidth.
> 
> Thanks,
> 
> Scott Madison, WN1B
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> [EMAIL PROTECTED]
> 
>  
> 
> 
> 
>  

__ 
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Re: [Repeater-Builder] GM300 TX Calibration

[Beaulé]

It is all available free from motorola Canada in
downloadable format   Regards  Warren VA5WDB
 --- wn1b8 <[EMAIL PROTECTED]> wrote: 
> 
> 
> Greetings,
> 
> Is there anyone on the list that has an
> understanding of the soft 
> calibration procedures for the M120/GM300 radios
> that would be 
> willing to help me? I'd prefer off list to as to not
> take up list 
> bandwidth.
> 
> Thanks,
> 
> Scott Madison, WN1B
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> [EMAIL PROTECTED]
> 
>  
> 
> 
> 
>  

__ 
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Re: [Repeater-Builder] Filters on Receive Side, how do I know if they are working?

[Bob Dengler]

At 1/9/2005 10:24 PM, you wrote:

>Mathew,
>
>When considering RF preamp gain, more is not always better.  I'm not
>familiar with the ARR preamp, but if it is a GaAsFET amplifier with 17
>dB or so of gain, and your bandpass cavities have 1.5 dB of insertion
>loss, I would put either a 6 dB or a 10 dB coaxial attenuator on the
>output of the preamp.  A net gain of 6 to 10 dB is usually enough to
>improve sensitivity without overloading the existing RF amplifier or
>mixer stages.

If you're using a G.E. Mastr (which one?) RX without a preamp, the ARR 
preamp is not going to overload the G.E.'s front-end.  Adding a 10 dB pad 
to the pramp output would knock your total gain ahead of the G.E. RX down 
to 5.5 dB.  OTOH if we're talking VHF you shouldn't need much gain ahead of 
the G.E. RX.  If we were talking UHF I'd say leave the pad out.

You didn't mention which G.E. RX you're using (MASTR Pro, II, 
Exec??)?  Anything other than a Mastr II will be a bit wide for 15 kHz 
spacing.  I know in the end the 9 kHz deviated signal is the culprit, but 
if you weren't getting adjacent-channel interference before it wouldn't 
take much of an improvement in IF selectivity to lose the interference 
while keeping the improved RX coverage.

Bob NO6B






 
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[Repeater-Builder] static buster

[skipp025]

Kevin, 

Would it be possible to ask you to describe how 
the Static Buster mounts to the antenna and or 
antenna tower?  

thanks
skipp 

> Kevin Custer <[EMAIL PROTECTED]> wrote:
> Any fiberglass radomed antenna will suffer greatly 
> from Corona and Precipitation Static, especially 
> when top mounted.  This was a big deal until the 
> Static Buster was developed, tested, and proven to 
> nearly eliminate the problem.
> 
> 
> Kevin Custer







 
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[Repeater-Builder] GM300 TX Calibration

[wn1b8]

Greetings,

Is there anyone on the list that has an understanding of the soft 
calibration procedures for the M120/GM300 radios that would be 
willing to help me? I'd prefer off list to as to not take up list 
bandwidth.

Thanks,

Scott Madison, WN1B







 
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Re: [Repeater-Builder] Re: Motorola microphone schematic #1

[Jim B.]

Neil McKie wrote:
> 
>   Don't need to use Google ... 
> 
>   Since you decided to ask questions ... 
> 
> nj902 wrote:
> 
>>FMTRU 5V indead! 
> 
> 
>   What was the final in the 5V? 

2E26

> 
>   What was the multiplication factor in the transmitter? 

hmmm-I want to say 24? Or 18...?
> 
>   How many crystals were used in the receiver? 

Was that the single-conversion rx? Or...I remember the P33BAT radios 
were double conversion, but used the same xtal for both LO's.

-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Re: Motorola microphone schematic

[Jim B.]

Mike Morris WA6ILQ wrote:

> 
> BTW the W6FNO repeater has been in continuous
> operation since at least 1967, possibly earlier...
> It was first on 82-70, then on 22-82. It was WR6ACD
> for a while, but it's the same group.  Nowadays it's a
> voting and simulcast system with 22-82 at both
> Johnstone Peak (about 3000 feet) and at Onyx Peak
> (at about 8,000 feet) over 60 miles away.
> 
> Anybody know of a repeater with a longer history?
> 
> Mike WA6ILQ

Not quite that old, but I think some of the inspiration for the Cuyahoga 
Amateur Radio Society's original setup came from that group. It started 
out as an ARES group on 6M AM that worked closly with Red Cross. It was 
determined (my father, Dave, K8MBV, was the main instigator ;c) that 6 
wasn't adequate for ARC's needs, and this new thing called FM would 
likely be the way to go. A number of 5V's were bought somehow, and got 
rocked up on .82 simplex. The repeater went on the air later, around 
late 68 or 69, as 146.46 in, 146.82 out, under the call WA8TTO. When the 
600 Khz thing came up, we just added a .22 rx, and called the .46 input 
a 'base input'. The repeater was all prog-line, with a home built amp, a 
pair of 4CX250's running about 200W. Yes, it was REALLY conservative.
-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] DC grounded antennas - ?

[Jim B.]

What do you mean by 'it didn't help'? Did the SWR stay the same? If so, 
the arrestor is bad and must be replaced. If not, you may have a bad 
connector or jumper somewhere. Make sure you eliminate everything else too.
-- 
Jim Barbour
WD8CHL


Benjamin Naber wrote:

> thought the same you did, but nope didn't help
> 
>  Any one else?
> 
> 
> ~Ben, KB9LFZ
> 
> 
> --- Rick - VA3RZS/Charlotte  - VA3CMR
> <[EMAIL PROTECTED]> wrote:
> 
> 
>>I could be wrong but I would say there is a problem
>>with the L . A .. 
>>check it out on a dummy load .. that you know is
>>good .. I looked at 
>>mine and thay are all fine and do not move the swr
>>up and all ... 
>>
>>others might have a better answer for you 
>>
>>
>>Rick
>>
>>
>>On 7 Jan 2005 at 12:01, Benjamin Naber wrote:
>>
>>
>>>afternoon ya'll
>>>
>>>  Done a little bit of reading and playing around,
>>>what is an advantage and disadvantage of using DC
>>>gounded antennas?
>>>
>>>  One thing I am curious about is why when a
>>
>>lightning
>>
>>>arrestor is used with a DC grounded antenna, does
>>
>>the
>>
>>>SWR go up? A while back I installed a lightning
>>>arrestor in line with my j-pole and the SWR went
>>
>>WAY
>>
>>>up - something like a 3 or 4. Just recently I
>>>installed a 5/4 wave shorted stub and the same
>>
>>thing.
>>
>>>In either case, why would the SWR go up?
>>>





 
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Re: [Repeater-Builder] DB224 Mounting On Top or Side Which is Better

[Jim B.]

Chuck Kelsey wrote:
> Side mounting is going to be much better mechanically, assuming you bracket 
> at the top of the antenna as well.
> 
> If you can afford to give up coverage to the back of the tower, this is not 
> a bad choice.
> 
> Chuck
> WB2EDV
> 
>>
>>Just want to get some input on what users think.  I have the option
>>to mount a DB224 on the top of a tower or side mounted at the top,
>>which would be best, in regards to noise verses stability, etc.
>>
>>Mathew

...and if you mount it out about one wavelength from the tower, the 
side-mount issue becomes moot. It becomes so close to an omni pattern 
the difference is negligible.
-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] stuff on greedbay

[[EMAIL PROTECTED]]

I must say it is interesting how many of us are posting on e bay. There are a 
lot of email addresses that I know.

bob kd6gnb 
 

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Re: [Repeater-Builder] Micor Base Station Battery Backup Circuit

[Maire Company]

it is done with a special power supply made for that use.


- Original Message - 
From: "Jim Cicirello" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 10, 2005 10:53 AM
Subject: [Repeater-Builder] Micor Base Station Battery Backup Circuit


> 
> 
> "Happy New Year"
> I am looking for a print or detailed description of how Motorola
> hooked their Battery Backup Circuit into the Micor Base/Repeater
> Power Supply. I found a schematic on repeater-builder 1106.jpg, but I
> didn't get a good print out on my end. I remember seeing a portion of
> a service manual that had the circuit, but as luck would have it my
> manual does not have the circuit. Any help would be appreciated as
> always.
> 
> 73 JIM KA2AJH Wellsville, New York
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
>




 
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[Repeater-Builder] Micor Base Station Battery Backup Circuit

[Jim Cicirello]

"Happy New Year"
I am looking for a print or detailed description of how Motorola
hooked their Battery Backup Circuit into the Micor Base/Repeater
Power Supply. I found a schematic on repeater-builder 1106.jpg, but I
didn't get a good print out on my end. I remember seeing a portion of
a service manual that had the circuit, but as luck would have it my
manual does not have the circuit. Any help would be appreciated as
always.

73 JIM KA2AJH Wellsville, New York










 
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[Repeater-Builder] Re: Filters on Receive Side, how do I know if they are working

[skipp025]

Crystal Filters do quite a bit, but they are 
very expensive and have more than modest 
insertion loss. Piezo Technologies makes them. 

You can obtain improved IF crystal filters from 
Com-Spec. They help, but tend to be less of a 
problem solver vs the antenna lead Piezo filters.

skipp 
www.radiowrench.com/sonic 

> "Laryn Lohman" <[EMAIL PROTECTED]> wrote:
> No amount of tuning or selectivity (except maybe 
> crystal filters???  I've never used them) ahead 
> of your receiver will reduce the offender.  Narrower 
> IF filters within your receiver may help, but
> there are practical limits to that. 
> 
> Laryn K8TVZ 







 
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Re: [Repeater-Builder] Filters on Receive Side, how do I know if they are working?

[Eric Lemmon]

Mathew,

When considering RF preamp gain, more is not always better.  I'm not
familiar with the ARR preamp, but if it is a GaAsFET amplifier with 17
dB or so of gain, and your bandpass cavities have 1.5 dB of insertion
loss, I would put either a 6 dB or a 10 dB coaxial attenuator on the
output of the preamp.  A net gain of 6 to 10 dB is usually enough to
improve sensitivity without overloading the existing RF amplifier or
mixer stages.

Unfortunately, there's not a lot you can do about an adjacent-channel
station that is overdeviating.  His peaks are intruding into your
receiver's bandpass, and are valid signals- even though they are
unwanted.  If you have documented proof that another station is
operating outside of "good Amateur practice," perhaps your local
Official Observer needs to get involved.

73, Eric Lemmon WB6FLY

w9mwq wrote:
> 
Everyone remembers my problems I had with a neighbor about 26 miles away
getting into my repeater on the input with his 9 kHz wide
 transmitter, which the GE MASTR receiver took care of that, but I just
installed a ARR preamp, and he is back, and I think I tuned
 them correctly, the DB-4001-2 Filters.  Antenna is up at 90' and can be
accessed about 25 miles away with a Handi-Talki using a rubber duck.  So
the receive is good, but too good.  And I know the problems with
preamps, but was hoping the filters would prevent that.  Any thoughts? 
I am getting no desense on the receiver that I can detect, and that is
with the two hundred watt pa running.  Any ideas other than removing the
preamp back out of line, and yes, I am planning a letter to the Ham
causing interference.
> 
> Mathew
> 
> 
> Yahoo! Groups Links
> 
> 
> 
>





 
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Re: [Repeater-Builder] Converting a Pass filter

[Burt Lang]

I don't know what a 74-70 is - my old TXRX catalogue does not list it. 
But I have converted a TXRX 4 can multicoupler to a 2m BpBr Duplexor for 
a local club quite successfully.  I will discuss it with you off-list if 
you are interested.

Burt  VE2BMQ

wa9ba wrote:
> 
> I was wondering if anyone has had any luck converting a TX RX 74-70 
> Pass filter to a Reject? I tryed looking in the archives but is so 
> time consuming.
> Bill
> 
>




 
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[Repeater-Builder] Re: Filters on Receive Side, how do I know if they are working

[Laryn Lohman]

Mathew, I don't remember exactly what the problems were with your
earlier posts, but I understand that you have an adjacent channel user
with 9kc deviation, right?  If so, then cavity filters will have
absolutely no effect.  The passband of even large cavities is far
wider than the 15 or 20 kc of spacing you are dealing with here.  It
sounds like the preamp you added is simply (obviously) pushing more
signal from the offending transmitter into your receiver, making it
more susceptable to the offender.  The real culprit here is the wide
transmitter.  No amount of tuning or selectivity (except maybe crystal
filters???  I've never used them) ahead of your receiver will reduce
the offender.  Narrower IF filters within your receiver may help, but
there are practical limits to that. 

Laryn K8TVZ 
 


--- In Repeater-Builder@yahoogroups.com, "w9mwq" <[EMAIL PROTECTED]> wrote:
> 
> Everyone remembers my problems I had with a neighbor about 26 miles 
> away getting into my repeater on the input with his 9Khz wide 
> transmitter, which the GE MASTR receiver took care of that, but I 
> just installed a ARR preamp, and he is back, and I think I tuned 
> them correctly, the DB-4001-2 Filters.  Antenna is up at 90' and can 
> be accessed about 25 miles away with a Handi-Talki using a rubber 
> duck.  So the receive is good, but to good.  And I know the problems 
> with preamps, but was hoping the filters would prevent that.  Any 
> thoughts.  I am getting no decense on the receiver that I can 
> detect, and that is with the two hundred watt pa running.  Any ideas 
> other than removing the preamp back out of line, and yes I am 
> planning a letter to the Ham causing interference.
> 
> Mathew







 
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Re: [Repeater-Builder] Re: Motorola microphone schematic

[Neil McKie]

  Ah, ok. 

  I won't go looking for that diagram.

  Neil  

Mark Holman wrote:
> 
> Not really Neil just thought to say something I think it grew 
> legs one day around 1979 I knew this mike was really nice just 
> someone wanted it better than I did.
> 
> 5 Finger discounts you know that goes.
> 
> M. H.
> 
> - Original Message -
> From: "Neil McKie" <[EMAIL PROTECTED]>
> To: 
> Sent: Saturday, January 08, 2005 11:58 PM
> Subject: Re: [Repeater-Builder] Re: Motorola microphone schematic
> 
> >
> >
> >  Are you seriously looking for the schematic diagram for the TU-154?
> >
> >  Neil
> >
> > Mark Holman wrote:
> >>
> >> Say Rob.
> >>  Ye olde ancient stuff Motorola probably never gave the data
> >> on the web since it was presumed DOA .
> >>
> >> M. H.
> >>
> >> - Original Message -
> >> From: "Rob" <[EMAIL PROTECTED]>
> >> To: 
> >> Sent: Friday, January 07, 2005 10:31 AM
> >> Subject: [Repeater-Builder] Re: Motorola microphone schematic
> >>
> >> >
> >> >
> >> > Well the specific one is from a CDM750 but I think most operate in
> >> > the same basic manner. It isn't so much an exact schematic I need but
> >> > a basic operation diagram. Motorola supplies about +5V on the mic
> >> > line and the mic element is also connected throgh the PTT switch
> >> > somehow.
> >> > What I am trying to figure out is if I can use a mic amp to boost the
> >> > gain for an autopatch.
> >> > It is almost looking like I may have to custom build an amp out of a
> >> > FET or something like an other responder did.
> >> >
> >> > As to the TU-154, all I get is hits for an old Russian airliner.
> >> > Thanks -Rob-
> >> >
> >> > --- In Repeater-Builder@yahoogroups.com, Neil McKie <[EMAIL PROTECTED]>
> >> > wrote:
> >> >>
> >> >>   Not a problem, if you can remember which radio you had it
> >> >>  connected to when you installed it, I probably have the manual
> >> >>
> >> >>   Was that a FMTRU-5V ?
> >> >>
> >> >>   Neil
> >> >>
> >> >>
> >> >>
> >> >> Mark Holman wrote:
> >> >> >
> >> >> > type in TU-154 for Motorola, an old remote head with a amplified
> >> > mic.older
> >> >> > than dirt 1964 I think.
> >> >> >
> >> >> > I had one or 2 my dad gave me no radio though  :-(
> >> >> >
> >> >> > M. H.
> >> >> >
> >> >> > - Original Message -
> >> >> > From: "Rob" <[EMAIL PROTECTED]>
> >> >> > To: 
> >> >> > Sent: Wednesday, January 05, 2005 1:15 AM
> >> >> > Subject: [Repeater-Builder] Motorola microphone schematic
> >> >> >
> >> >> > >
> >> >> > >
> >> >> > > Anyone know if the schematic for an amplified Motorola Mic is
> >> >> > > available on the net?
> >> >> > > Still trying to get this autopatch going and having some real
> >> > level
> >> >> > > issues. My patch just doesn't have enough drive for the radio.
> >> >> > > TIA -Rob-
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > > Yahoo! Groups Links
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> > >
> >> >> >
> >> >> >
> >> >> > Yahoo! Groups Links
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> 
> 
> Yahoo! Groups Links
> 
> 
> 
>





 
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[Repeater-Builder] Re: F.S. List

[skipp025]

Hi Steve,

Thanks for the heads up... it's a great idea, 
but would require numerous Email accounts 
to keep the inbound messages under control. 

That's when one is a member of more than 
one or two yahoo groups. 

Those posting should at least know many of 
us read the group through yahoo on the web. 

replacing the @ symbol with "at" gives the 
rest of us a clue. 

cheers, 
skipp 

skipp025 at yahoo.com 

> "Steven Passmore" <[EMAIL PROTECTED]> wrote:
> Skipp,  you might consider sending the list 
> email to a regular email account 
> instead of viewing it on the yahoo groups site. 
> Even if it's just some freebie one.  Yahoo 
> doesn't chop the senders address in that case.
> 
> His address is johneverson at sbcglobal.net
> 
> Steve P.
> 







 
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Re: [Repeater-Builder] Re: F.S. List

[Steven Passmore]

Skipp,  you might consider sending the list email to a regular email account 
instead of viewing it on the yahoo groups site. Even if it's just some 
freebie one.  Yahoo doesn't chop the senders address in that case.

His address is johneverson at sbcglobal.net

Steve P.

- Original Message - 
From: "skipp025" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 09, 2005 6:03 PM
Subject: [Repeater-Builder] Re: F.S. List


>
>
> Here's the example of what comes through
> from yahoo. Notice the trailing part of
> your Email domain name is chopped off.
>
> I replace the @ with the word at and
> follow it with the domain as shown
> below.
> skipp
>
>> "John Everson" <[EMAIL PROTECTED]> wrote:
>>
>> --- "skipp025" <[EMAIL PROTECTED]>  wrote:
>> >
>> > John,
>> > Yahoo chops Email domains off the post.
>> > Please Email your full address to me.
>> >
>> > thank you
>> > [EMAIL PROTECTED]
>> > skipp025 at yahoo.com
>> >
>> Hi Skipp. The addy here is  [EMAIL PROTECTED]
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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Re: [Repeater-Builder] DB224 Mounting On Top or Side Which is Better

[Kris Kirby]

On Sun, 9 Jan 2005, Kevin Custer wrote:
> BTW:  I have never seen a failed Sinclair SRL-229 that has been SB 
> equipped.  I have seen Stationmasters hit so hard it blew the decoupling 
> sleeve (aluminum mount) down through the double clamps like someone hit 
> it with a 500 lb. sledge hammer.

That's electromagnetic repulsion for you.

--
Kris Kirby, KE4AHR  <[EMAIL PROTECTED]>  TGIFreeBSD IM: 'KrisBSD' 
"BIG BROTHER IS WATCHING YOU!" - 1984-2004 - 20 yrs of Govt Surveillance
 This message brought to you by the US Department of Homeland Security




 
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[Repeater-Builder] Re: F.S. List

[skipp025]

Here's the example of what comes through 
from yahoo. Notice the trailing part of 
your Email domain name is chopped off. 

I replace the @ with the word at and 
follow it with the domain as shown 
below. 
skipp 

> "John Everson" <[EMAIL PROTECTED]> wrote:
> 
> --- "skipp025" <[EMAIL PROTECTED]>  wrote:
> > 
> > John, 
> > Yahoo chops Email domains off the post. 
> > Please Email your full address to me. 
> > 
> > thank you 
> > [EMAIL PROTECTED]  
> > skipp025 at yahoo.com  
> > 
> Hi Skipp. The addy here is  [EMAIL PROTECTED]








 
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RE: [Repeater-Builder] DB224 Mounting On Top or Side Which is Better

[Paul Finch]

Hello,

I have 2-Sinclair VHF 140 MHz to 160 MHz (I think) 4 dipole 6 DB gain
antennas, 2 UHF DB 410 and two DB 800 to 860 MHz on top of my 500 foot
commercial tower.  I have never had any problems with them except the mounts
on the Sinclair antennas were not tightened enough and they are leaning over
slightly.  They have been in service now since 1998, all on 1 5/8 inch
Andrew Heliax.  Two of which are air.  All coaxes have grounding kits at the
top, middle and bottom and the base of the tower has big copper cable going
to 6 ground radials.

I also have a 28 foot wet well that is not in service yet that is made out
of 4 inch copper pipe, there is water 6 foot down the well.  As soon as I
finish the new building I will attach that to the ground system running all
around the base of the building.

I think the lack of problems with lightning is due to the fact that the
folded dipole antennas are about 5 feet taller than the fiberglass antennas.
I have a new broadband, 6 degree downtilt 900 MHz antenna to go up to the
top also, unknown if it will be on a different coax or replace one of the
old 800 MHz antennas.

Paul

-Original Message-
From: Kevin Custer [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 09, 2005 7:25 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] DB224 Mounting On Top or Side Which is
Better



w9mwq wrote:

>Just want to get some input on what users think.  I have the option
>to mount a DB224 on the top of a tower or side mounted at the top,
>which would be best, in regards to noise verses stability, etc.
>

I top mounted a brand new DB-224E on top a 200 foot tower about 7 years
ago.  It broke just above the top clamp after being up only about 6
months.  I have several other 224's in service elsewhere, some top
mounted and some side mounted.  Most of these have seen 10 + years of
service, with no failures.

[Personal Opinion]   Fiberglass arrays like the Sinclair SRL-229 or
super stationmaster give better omni directional coverage when top
mounted, but they can break or be destroyed by lightning, although when
mounted with a Static Buster lightning is less of a concern. Side
mounting is always better for mechanical stability because you can
support the middle and/or top of the array.  Side mounting a dipole
array can allow you to tailor the coverage area, if desired or required,
and protects the antenna from lightning to some degree.

BTW:  I have never seen a failed Sinclair SRL-229 that has been SB
equipped.  I have seen Stationmasters hit so hard it blew the decoupling
sleeve (aluminum mount) down through the double clamps like someone hit
it with a 500 lb. sledge hammer.

YMMV.

Kevin Custer






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[Repeater-Builder] Sinclair SRL229 Antenna recommended for Repeaters

[Mr John Lloyd]

Kevin,

I also recommend the Sinclair SRL229 having used them
at my 147.180 repeater site at 11,000 Ft for over 30
years now!

I have had one apart and the radiating elements are
made of solid brass rod with phasing coils between
elements.

The ends of the rods are drilled out for the phasing
coils to be soldered in place. There is a combination
of shorted stubs in the mounting base with one made
out of RG142 coax and tucked up inside.
  
The top element is attached to the lightning spike
that is pushed through the top of the Radome and
tightened with a nut and lockwasher.

Three screws are removed at the bottom mounting pipe
to remove the inside antenna elements.

John Lloyd, K7JL

Intermountain Intertie
http://www.ussc.com/~uvhfs/snowpix1.shtml



   Date: Sun, 09 Jan 2005 10:49:09 -0500
   From: Kevin Custer <[EMAIL PROTECTED]>
Subject: Re: Re: Decibel Products DB-224 Antenna &
Noise

Doug Zastrow wrote:

> Russ brought up the point that some techs really shy
> away from the DB-224 because of the potential noise
> problem.  I've been scared of the fiberglass
> collinears because of the element solder joint crack
> issue and it's resultant noise problems.
>  
> What's the commercial 'antenna of choice' for
> two-meter repeater operation here at
> Repeater-Builder?


I have had excellent long-term luck with the Sinclair
SRL-229.  It's a large aperture (23+ foot) fiberglass
radomed stick, but is not built like the stationmaster
with opposing sections of large (copper water pipe)
coax.  I have had experience with several that have
been up for 20+ years without failure in the duplex
mode.  I don't know how they are made internally
because I have never had to take one apart.  A
Sinclair 
Engineer told me they were not made like their
competition, and might possibly be solid rod with
phasing coils between them.

Any fiberglass radomed antenna will suffer greatly
from Corona and Precipitation Static, especially when
top mounted.  This was a big deal until the Static
Buster was developed, tested, and proven to nearly
eliminate the problem.


Kevin Custer




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Re: [Repeater-Builder] DB224 Mounting On Top or Side Which is Better

[Kevin Custer]

w9mwq wrote:

>Just want to get some input on what users think.  I have the option 
>to mount a DB224 on the top of a tower or side mounted at the top, 
>which would be best, in regards to noise verses stability, etc.
>

I top mounted a brand new DB-224E on top a 200 foot tower about 7 years 
ago.  It broke just above the top clamp after being up only about 6 
months.  I have several other 224's in service elsewhere, some top 
mounted and some side mounted.  Most of these have seen 10 + years of 
service, with no failures. 

[Personal Opinion]   Fiberglass arrays like the Sinclair SRL-229 or 
super stationmaster give better omni directional coverage when top 
mounted, but they can break or be destroyed by lightning, although when 
mounted with a Static Buster lightning is less of a concern. Side 
mounting is always better for mechanical stability because you can 
support the middle and/or top of the array.  Side mounting a dipole 
array can allow you to tailor the coverage area, if desired or required, 
and protects the antenna from lightning to some degree.

BTW:  I have never seen a failed Sinclair SRL-229 that has been SB 
equipped.  I have seen Stationmasters hit so hard it blew the decoupling 
sleeve (aluminum mount) down through the double clamps like someone hit 
it with a 500 lb. sledge hammer.

YMMV.

Kevin Custer





 
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Re: [Repeater-Builder] Re: Motorola microphone schematic

[Mark Holman]

Not really Neil just thought to say something I think it grew legs one day 
around 1979 I knew this mike was really nice just someone wanted it better 
than I did.

5 Finger discounts you know that goes.

M. H.

- Original Message - 
From: "Neil McKie" <[EMAIL PROTECTED]>
To: 
Sent: Saturday, January 08, 2005 11:58 PM
Subject: Re: [Repeater-Builder] Re: Motorola microphone schematic


>
>
>  Are you seriously looking for the schematic diagram for the TU-154?
>
>  Neil
>
> Mark Holman wrote:
>>
>> Say Rob.
>>  Ye olde ancient stuff Motorola probably never gave the data
>> on the web since it was presumed DOA .
>>
>> M. H.
>>
>> - Original Message -
>> From: "Rob" <[EMAIL PROTECTED]>
>> To: 
>> Sent: Friday, January 07, 2005 10:31 AM
>> Subject: [Repeater-Builder] Re: Motorola microphone schematic
>>
>> >
>> >
>> > Well the specific one is from a CDM750 but I think most operate in
>> > the same basic manner. It isn't so much an exact schematic I need but
>> > a basic operation diagram. Motorola supplies about +5V on the mic
>> > line and the mic element is also connected throgh the PTT switch
>> > somehow.
>> > What I am trying to figure out is if I can use a mic amp to boost the
>> > gain for an autopatch.
>> > It is almost looking like I may have to custom build an amp out of a
>> > FET or something like an other responder did.
>> >
>> > As to the TU-154, all I get is hits for an old Russian airliner.
>> > Thanks -Rob-
>> >
>> > --- In Repeater-Builder@yahoogroups.com, Neil McKie <[EMAIL PROTECTED]>
>> > wrote:
>> >>
>> >>   Not a problem, if you can remember which radio you had it
>> >>  connected to when you installed it, I probably have the manual
>> >>
>> >>   Was that a FMTRU-5V ?
>> >>
>> >>   Neil
>> >>
>> >>
>> >>
>> >> Mark Holman wrote:
>> >> >
>> >> > type in TU-154 for Motorola, an old remote head with a amplified
>> > mic.older
>> >> > than dirt 1964 I think.
>> >> >
>> >> > I had one or 2 my dad gave me no radio though  :-(
>> >> >
>> >> > M. H.
>> >> >
>> >> > - Original Message -
>> >> > From: "Rob" <[EMAIL PROTECTED]>
>> >> > To: 
>> >> > Sent: Wednesday, January 05, 2005 1:15 AM
>> >> > Subject: [Repeater-Builder] Motorola microphone schematic
>> >> >
>> >> > >
>> >> > >
>> >> > > Anyone know if the schematic for an amplified Motorola Mic is
>> >> > > available on the net?
>> >> > > Still trying to get this autopatch going and having some real
>> > level
>> >> > > issues. My patch just doesn't have enough drive for the radio.
>> >> > > TIA -Rob-
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > > Yahoo! Groups Links
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> > >
>> >> >
>> >> >
>> >> > Yahoo! Groups Links
>> >> >
>> >> >
>> >> >
>> >> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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