But it is your statement.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Ron Wright
> Sent: Sunday, September 02, 2007 6:46 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: RE: RE:
How do you know it is not 75 ohms at DC?
How long do you think it will take for the DC signal to reach the other end
of the coax if it is applied at one end? Will it be at the speed of light?
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Re
Ron,
Maybe you could tell us why coax cable has a lower frequency limit? You
claim that it does but have not explained why or how.
Why does the impedance change significantly at lower frequencies?
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogrou
bout a flat response from around 5
Hz to 1 MHz. Is that an audio amplifier or an RF amplifier? :>)
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Ron Wright
> Sent: Friday, August
s it's seeing on both its input & output.
> > >
> > > Bob NO6B
> > >
> >
> >Hi Bob,
> >
> >Please read again what I wrote. I am not sure that you are following how
> the
> >meters are in the circuit. Remember that whatever you do at
characteristic impedance fall apart at .5 MHz would be a
mystery. 75 ohm cable is used extensively in video base band applications
where flat low frequency response is needed.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED]
is much longer at 60 Hz and you need
to travel a much greater distance to see the effects but the effect are the
same.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Ron Wright
> Sent: Thursda
limit?
Open wire lines begin to radiate as frequency is increased to the point
where the line spacing becomes an appreciable portion of a wave length due
to the time it takes for propagation of fields between wires.
73
Gary K4FMX
> -Original Message-
> From: Repeater-B
It does NOT have the same R at different frequencies. It
has the same "Z" (surge or characteristic impedance) at all frequencies but
not the same series resistance R. The resistance increases because of skin
effect the higher the frequency is. This is where loss comes from.
73
Gary K4F
at least 1/4 wavelength long. This is impractical at HF
frequencies and cumbersome at VHF.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Ron Wright
> Sent: Wednesday, August 29, 2007 9:00 AM
&g
thus eliminating the mismatch.
>
> My guess is that the higher power reading on the wattmeter is due to the
> weird impedances it's seeing on both its input & output.
>
> Bob NO6B
>
Hi Bob,
Please read again what I wrote. I am not sure that you are following how the
s under or
overloaded due to the non 50 ohm load that it is seeing but it is not
dissipating any of the reflected power. Many solid state transmitters are
sensitive to reactive loads and may draw more current because of this.
73
Gary K4FMX
On 8/27/07, Gary Schafer <[EMAIL PROTECTED]&
f the line. Dielectric loss contributes very
little to loss below UHF. Above that if does become a major factor.
As frequency goes up so does skin effect loss. The surface of the conductor
becomes thinner as far as RF goes with increased frequency as the RF does
not penetrate as deeply.
73
I forgot to mention in my last post that only considering the center
conductor size in coax cable is necessary in these discussions of loss. The
shield of the coax has many times the surface area of the center conductor
and has much less resistive loss than the center conductor does.
73
Gary
between an open and a short depending on how far from 50 ohms the
load is. In other words the load impedance gets "transformed" to something
else.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent: Monday, A
does all I squared R loss.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent: Sunday, August 26, 2007 3:32 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: Re: RE: [Repeater-Builder] Re: Duplexers
Well skin eff
te as
well as Andrew/DB and EMR.
Gary
sms mms wrote:
Dear Sir,Can anyone suggest me from where I
can get the tunning/design idea of 220 MHz duplexer? This is very urgent.I
think the article about this has been published on repeater builder, but
I have not found.Thanks in advance.
5, 50, 500, 5000 -
moved out.
Gary
Larry Wagoner wrote:
> At 07:42 AM 7/29/2007, you wrote:
>
>> Remember UPS's brainchild circa 1988-90 - petitioning the FCC for
>> 220 spectrum for nationwide data - -
>
>
> Just one thing ...
> The 220 Mhz area is NOT 4-meters.
> It is 1.25 meters ...
>
> Larry
> N5WLW
lse's transmitter with the resulting product falling
on your receive frequency. It is all intermodulation. i.e. the result of
mixing of two or more frequencies in a non linear device.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
&g
the repeater antenna there can
be fundamental overload of the receiver so some form of additional
protection may help.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck
Sent: Thursday, July 26, 2007 9:40 AM
To: Repeater-Builder
You came across what?
Gary
[EMAIL PROTECTED] wrote:
> After searching the repeater-builder.com for Micor power supplies,
> then my emails to the beginning of 2006.
>
> I came across this which might be what I am looking for. Although, it
> is not in the repeater-builder
long way from the design frequency. As you tune the notch a long
ways the ultimate or best pass side (where there is minimum insertion loss)
gets shifted to the opposite side from where it was originally. Most of
those have an internal capacitor that you can't get to.
73
Gary
because of it. The reverse can also happen
with the ctcss decoder. The repetition rate of both are close to each other
and the dcs is transmitted as more of a sin wave than it is a square wave so
the decoders have a hard time distinguishing each other.
73
Gary K4FMX
> -Original Messag
an usually obtain some impedance that the
transmitter likes better than what the duplexer might be supplying with a
random length cable.
Please note that most duplexer manufacturers recommend trying different
cable lengths to cure the type of problems we have been discussing.
73
Gary K4FMX
that
radio??
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Jeff DePolo
> Sent: Sunday, July 01, 2007 10:47 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] Cable
eiver).
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Steve S. Bosshard (NU5D)
> Sent: Sunday, July 01, 2007 9:35 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder]
Why would you ever want to do that? Unless you like destroying isolators.
:>)
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Steve S. Bosshard (NU5D)
> Sent: Sunday, July 01, 2007 8:52 PM
isolator load and change cable lengths between
duplexer and isolator or tune a Z matcher if you have one, for minimum power
into the isolators load. That will give you maximum power to the antenna and
you will have a near perfect 50 ohm load on the transmitter always.
73
Gary K4FMX
itters are not created
equal.
I do agree with you that gross problems that show up are signs of problems
that need to be fixed other than changing cables.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Be
more sets anyway.
Gary
JOHN MACKEY wrote:
> I need to get mounts for side mounting an antenna to a tower. Who is
> supplying stuff like that now days?
>
>
> Yahoo! Groups Links
>
>
>
t may cause the transmitter to act up.
Something to look at.
73
Gary K4FMX
the impedance has to change quickly as you move away from the
wanted frequency in order for the duplexer to do its job.
73
Gary K4FMX
e off frequency reactive load.
Now if there is an isolator on the transmitter then the transmitter always
sees a flat 50 ohms regardless of what the duplexer is presenting and in
that case the length of cable makes no difference.
73
Gary K4FMX
>
> The only time that you need specific lengt
to "clean up
a transmitter" too. An isolator provides a flat 50 ohm load to the
transmitter no matter what kind of load the antenna or duplexer may present.
Sometimes transmitters get a little "squirrelly" and generate spurs when not
seeing a flat 50 ohms.
A bandpass filter is not only a good idea to have after an isolator, it is a
must have device. Or a low pass filter in place of the bandpass filter as
isolators generate strong harmonics that need to be filtered.
73
Gary K4FMX
not. I suggest you read up on modern voice encoding/decoding methods for a
better understanding. Remember, D-Star is an open, published standard. Icom
America offers a link to the JARL documentation as does the JARL.
Gary
"Ron Wright, Skywarn Coodinator" wrote:
> Hi all,
>
> Thanks
you move away from the
tuned frequency. With a pass cavity they will usually show the curve with 3
different insertion losses set so you can see the difference. Some will also
show the result of 2 and 3 cavities in series.
73
Gary K4FMX
> -Original Message-
> From: Repeater-B
AIE (automated Industrial electronics) used to make a pl/dpl counter box. It
would count all tones and the number of hits on each. There may be some
floating around yet. I may even have one stuffed in the closet yet, not
sure.
73
Gary K4FMX
> -Original Message-
> From: Repeater-B
rs because of the botched job of trying to make a close space
duplexer and not getting the cables right.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of skipp025
> Sent: Monday, May 28, 2007 2:03 AM
ore amateur equipment manufacturers offer D-Star
capable gear. Soon I hope to try out the European TETRA digital format for
more comparison and education. These are the voice modes of tomorrow so I
think it's in my best interests to learn them today.
73,
Gary
Coy Hilton wrote:
> This brings
You mean analog audio vs. digital audio, both are conventional FM in this
application.
Gary
Dan Blasberg wrote:
> If you want a "fair" test, find a P25 machine and barrow a radio. The
> P25 machines have the ability to do mixed mode (that is conventional FM
> and digital) an
d comms between units inside the arena
to units outside the arena as well as from the motel to the arena. We've never
been able to do that 100% with an analog channel.
Gary
Chuck Kraly wrote:
> Not sure about the radios, but this echoes what we found in Dayton last
> weekend. We were
real eye opener for those
who use those inexpensive, unrated meters on AC power systems. All
current Fluke DMMs are catagory rated per IEC1010.
Gary
Doug W7FDF wrote:
> I have need of a battery operated portable digital multimeter. I have
> a Simpson 260 analog meter and a bench ac operated Simpson
had for $20 to $40.00.
Only thing wrong with it is it is not auto-ranging but otherwise it is very
good.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of DCFluX
> Sent: Thursday, May 24, 2007 1
enths of a
volt does make a big difference in battery maintenance.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG
Sent: Thursday, May 24, 2007 12:25 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re
or other sources for parts.
Gary LaForce
garyl at sle dot com
glaforce at longviewcomm dot net
Gosh, I would call it the best way to go but it is one way. Depending upon
your budget there are full blown repeaters available for 33cm including
some GE's, Motorola MSF's and MTR's, also Tait's.
Gary
Luke wrote:
> I am working on a 33cm repeater for our group out here
I am looking for a manual for the Motorola (boonton) RF millivoltmeter
S-1339A.
If not the manual the calibration instructions would be helpful.
Thanks
Gary K4FMX
itter.
Wiring is very simple. Same connector as a Mitrek. Many tips are available
on Batlabs as to what pins to jumper, etc. to simulate a control head and
make the radio turn on. Best to use external cooling too.
Gary
k6kusman wrote:
> Hello all.. Does anyone have any info on the Moto Maratrac as
the
system several of the salesmen said "well that's the problem" , "There is no
way those GE radios are going to work as well a Motorola radio". Funny part
of it was that most of the salesmen really believed that. Talk about a
religious leader.. >:-)
73
Gar
was not as
hefty but still a very good antenna.
I have a couple of the lighter NOS Sinclair antennas for UHF if anyone is
interested. The model is 334-2. 6 db omni/ 8.5 db offset. $243.00 each.
These are UPS shippable as they have a split mast with coupler.
73
Gary K4FMX
with him about this issue.
Gary
George Henry wrote:
> They're already using a DVSI AMBE vocoder in their HF digital voice
> modems. it's certainly not a large leap from there to D-Star.
>
> SOMEONE will do it soon enough... I just figured AOR might be the first,
> si
also combine two receivers and allow duplex
operation.
You could have a 450 receiver working at the same time as a 150 transmitter
so that would be a duplex situation.
Maybe they should be called duo-duplexers. :>)
73
Gary K4FMX
> -Original Message-
> From: Re
has a
different emission designator (8K10F1E) than analog narrowband FM it is still
phone according to the FCC.
Gary
Nate Bargmann wrote:
> Here is the relevant portion for FCC jurisdictions:
> -
> §97.309 RTTY and data emission codes.
>
> (b) Where authorized by §§ 97.305(c) and 97
d surplus
stuff pops up at the most unexpected times.
Gary
"Steve Bosshard (NU5D)" wrote:
Thanks Gary, so what will it cost Mondo Ham
to go out and buy a VHF P25 radio - portable - battery and charger antenna
and speaker/mic new or used and the stuff to program it with?
Thanks, Steve
. P25 amateur repeaters are slowing popping up here and
there but mostly by LMR professionals who are also amateurs and have
access to surplus gear so I agree with you that it will be some time
before it becomes mainstream.
Gary
"Steve Bosshard (NU5D)" wrote:
> Until P25 radios become h
7;s the 10 cent tour on spectrum analyzers.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG
Sent: Tuesday, April 24, 2007 2:31 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] quick question
re
that there are no antenna problems also.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Jeff
> Sent: Tuesday, April 24, 2007 1:14 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Re
By the way, if you do tune the cavity while connected to the transmitter be
sure to do it at very low power or the contacts in the cavity may arc and
burn spots on the tuning rod.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
&g
meter the transmitter sees the same load as when the
wattmeter was in line.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Bob M.
> Sent: Friday, April 20, 2007 2:00 PM
> To: Repeater-Bui
Brady. See their line at http://www.bradyid.com .
Gary
Jack Taylor wrote:
> A little bit off-topic perhaps but perhaps not. What brand and model label
> makers are
> preferred by those that label their wiring? I would prefer something
> inexpensive as it
> wouldn't s
First check to see if the receive audio has the problem when the transmitter
is not on the air. Check that the signal is centered in the receive pass
band. Does it do it with more than one persons signal?
Try bypassing the lightning protector.
73
Gary K4FMX
> -Original Message-
>
Motorola, GE, Vega and many others have been doing it rather well for many
years.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Tuesday, April 03, 2007 1:26 PM
&g
ator?
>
> <<< see embedded responses below >>>
>
> --- In Repeater-Builder@yahoogroups.com, "Gary Schafer"
> <[EMAIL PROTECTED]> wrote:
> >
> > Duplexers and cavities have been tuned for many years
> > without a tracking generato
If you can't find the info from EMR you can look at most anyone's 7" cavity
specs and they will be very similar. Sinclair should have that info on their
web site.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EM
es to the antenna and not
to the other transmitter. So the other transmitter must be 10 db down on the
skirt of the opposite transmitters pass band skirt. You can think of these
cavities as switches. The same type of thing goes on at the T connection of
a duplexer.
73
Gary K4FMX
> -Original
at you
are working with or you may not have the same tuning when you hook it up to
your radio.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of w6nct
> Sent: Sunday, April 01, 2007 7:39 PM
ystal to
work with the existing parameters of the channel element.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Eric Lemmon
> Sent: Friday, March 30, 2007 12:16 AM
> To: Repeater-Builder@yahoo
d you will probably find what you need, They even give you a photo
so you know what you are looking for
Good luck!
Gary - W5GNB
--- In Repeater-Builder@yahoogroups.com, "Nate Duehr" <[EMAIL PROTECTED]>
wrote:
>
> On 3/25/07, kb5vjy <[EMAIL PROTECTED]> wrote:
> &g
$15.00 or so.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Doug Bade
> Sent: Wednesday, March 28, 2007 12:20 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] 220VA
Astron power supplies don't normally come with dual primaries.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Doug W7FDF
> Sent: Wednesday, March 28, 2007 11:39 AM
> To: Repeater-Bui
ou have to have VX4000FIELD
software for those. Just a few thoughts.
Gary
Maire-Radios wrote:
My
cable is bad to program the Vertex VX-4000 radio.Anyone
have a cable they could sell me? thanks
John [EMAIL PROTECTED]
ou have to have VX4000FIELD
software for those. Just a few thoughts.
Gary
Maire-Radios wrote:
My
cable is bad to program the Vertex VX-4000 radio.Anyone have a cable
they could sell me? thanks
John [EMAIL PROTECTED]
y end up being too short though.
If the phasing harness has connectors in it they can be lengthened by
installing some right angle connectors in each leg to lengthen them a bit.
I once did this with a Sinclair hybrid ring duplexer to lengthen the stubs
to get it to tune to 2 meters.
73
Gary K4FMX
If the receiver COS line keys up, it would not be seen by the
controller until the predetermined delay time from this little magic
circuit.
Anyone out there have any ideas on this?
GARY - W5GNB
down so it didn't fry the final. Worked pretty good!
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Milt
> Sent: Monday, March 26, 2007 10:50 PM
> To: Repeater-Builder@yahoogroups.com
>
Quickest way to kill the thread is to stop responding to it.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Don Kupferschmidt
Sent: Sunday, March 25, 2007 10:42 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [SPAM] RE
e chose to bring
the whole private exchange to this group, a stupid move on his part and it's
a shame some can't see that but instead have to jump in and stir the pot.
This topic has nothing to do with the subject matter of this group so let's
get back to Repeater Builder topics.
ng on this reflector.
Gary
[EMAIL PROTECTED] wrote:
Gary,
the real pitty here is that you are a language cop that can't even spell
pity.I
myself think it's time for you to get a both a dictionary or a spell checker
+ a life! In
a message dated 3/24/2007 10:57:23 A.M. Pacific Daylight
lated
topics normally discussed on this reflector. Please ignore this thread
as it has nothing to do with Repeater Builder.
Gary
Paul Metzger wrote:
Begin forwarded message:
From:
Gary <[EMAIL PROTECTED]>
Date:
March 24, 2007 10:42:26 PDT
To:
Paul Metzger <[EMAIL PROTECTED]>
Subjec
There are some graphs on this site I believe that show antenna isolation for
different separations. That will get you started.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Sam
> Sent: Frid
I always got a chuckle out of the hams that just had to rip out the rca
jacks on their heath kits and butcher the chassis to put in an SO239 jack.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of
ised!
>
> On 3/22/07, Gary Schafer <[EMAIL PROTECTED]> wrote:
>
> > If you really want to get picky use only N connectors and not even bnc.
> A
> > bnc is not a constant impedance connector either although somewhat
> better
> > than a PL259. Yes I know you c
mes deliberate impedance changes are made in transmission
lines. For example a piece of 75 ohm line can be used in a 50 ohm system
with an impedance transformer on each end. At the junction of the 75 ohm
cable and the transformer there is a large non constant impedance in the
line. Works fine.
73
Gary K4FMX
than one for 50 ohms. Note that 75 ohm cable has a smaller diameter
center conductor than a 50 ohm cable that has the same outer shield size.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of allan crites
Sent: Thursday, March 22, 2007 10
Roger that. They will plug in but will destroy the bnc side.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Dexter McIntyre W4DEX
> Sent: Thursday, March 22, 2007 10:47 PM
> To: R
la 2600 service monitor uses an N connector in
order to meet the flatness spec over the entire range even though most
people want a bnc for the rf connector on it. So they supply an N to bnc
adaptor with each unit for those that insist on bnc connectors.
73
Gary K4FMX
sense measurement before you put the
preamp in to verify things are as they should be so you don't end up chasing
two or three problems at the end. Then make a final de-sense measurement
when all done.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Re
> There area also two Sinclair BP/BR cans. One on the TX and one on the
> RX. The loss is set for 0.5 db on each.
>
> The interconnect cable is RG-400, no LMR.
>
> Dwayne Kincaid
> WD8OYG
>
Did you mean to say BP cans and not BP/BR for the extra cans?
BP/BR cans prov
p and
receiver. After all you are looking to add attenuators anyway. But adaptors
really make no measurable difference in attenuation at vhf or uhf. They may
give a slight impedance mismatch but you probably don't have anything that
will measure the small amount of loss from them.
73
G
What's the problem with it?
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of JOHN MACKEY
> Sent: Tuesday, March 20, 2007 5:57 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re
nt BEFORE they go to the equipment. That common
point is then tied to a multiple ground rod system including the tower
ground system. All grounds need to be bonded together.
Reading the polyphaser site is good advice.
73
Gary K4FMX
is gives a muddy
base sound but loud and of course it also contains the distortion products
generated by the heavy limiting.
For those that are new to setting up FM radios, you always set the deviation
control first, to 5 KHz or close to it. Then adjust the audio gain for
proper loudness. Don't adjust the deviation control to try and control
loudness.
73
Gary K4FMX
consecutive channels. However most channel assignments were not consecutive
because of interference problems with close spacing. Transmitter combining
was difficult too as most all had to be hybrid combiners and multiple
antennas to keep losses to a minimum.
73
Gary K4FMX
> -Original Mess
he tuning on the duplexer for minimum desense on the receiver
at the "remote" site in a pinch can sometimes be done but you have to be in
the ball park in the first place.
73
Gary K4FMX
touch.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Daron J. Wilson
Sent: Friday, March 02, 2007 12:14 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] repeater problems, duplexer etc.
Anyone have any ideas
because even though it is a notch only duplexer and doesn't exhibit any pass
band characteristics there is still a pass side on the notch. The other side
of the notch will have higher attenuation. This is usually determined by
fixed capacitors on the loop inside the cavities.
73
Gary
NO. You will create more problems.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Tony L.
> Sent: Friday, March 02, 2007 11:11 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Re
Zooom.
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Mullarkey
Sent: Thursday, March 01, 2007 10:34 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Diversity Antenna System ?
Hi Ken,
When you are dealing with 100
Pass transistors are the usual culprit.
Gary k7ney
- Original Message -
From: mike
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, February 28, 2007 5:17 PM
Subject: [Repeater-Builder] astron rs 35a
my power supply keeps blowing the fuse
changed the pc board
i
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