The answer is YES but you need to do a few things to get it there.
Best would be to check out the information on www.batlabs.com and click on the
GM300 link.
You need of course the Motorola programming software and interface, and when
you want to program a new frequency, in your case 433Mhz,
Yes Sean. that's exactly it!
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Saturday, January 12, 2008 4:28 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] APRS linking to CAT Controller
Hi Mike,
I never said I was putting up a digi.
I want to hear from people who have the Ultimeter 100 connected to both a
WXTrak and the CAT1000.
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Johnson
Sent: Saturday, January 12, 2008 11:37 AM
To:
Paul,
You have to account for the velocity factor of the cable. The length you use
has to be the electrical length not the physical length.
This measurement that you made indicates that the cable is a quarter wave
(not ½ wave) at 146.15 if indeed you do have the far end open.
146.15 MHz
Paul, I think where the problem with your measurements comes up is that your 41
inches of RG-8 is close to 3/4 wave at 2 meters, not 1/2 wave. Taking a rough
estimate of 19 inches for a quarter wave on 2 meters (the approximate length of
your quarter wave ground plane vertical element) you
One of the initial proposals
was an open, 1/4-wave stub tuned for the FM broadcast
frequency, fed on a coaxial T-connector. This is, indeed, a
common method to trap a particular frequency.
I set forth that this wouldn't work, as the desired pass
frequency was too near the 9th harmonic
Other things to think about...
Probably the more practical bang for your buck help would
be a very High-Q notch network/cavity placed in the 900 MHz
antenna system. The better High-Q network option is most
often found to be larger diameter cavities and/or a
combination of more than one
You could add a simple 555 timer circuit to/through the decoder
output line to hold the valid ctcss detect signal low for x-amount
of (adjustable) time after a signal goes away. If x-amount of
decode valid logic tail-time is enough to allow the vote process
to complete... then you should not
Rick
Kevin is correct - you can try the SHIFT Entry method, except do NOT hold
down the shift key when entering the decimal point. For example, a
frequency of 433.1750 would appear as follows: $##.!%) (notice the
decimal). Should work OK for your application. But Kevin is correct -
check
Remember also while using the shiftmethod to fill in the entire freq area
including the trailing zeros.
Glenn
W8AK
In a message dated 1/13/2008 1:39:58 P.M. Eastern Standard Time,
[EMAIL PROTECTED] writes:
Rick
Kevin is correct – you can try the “SHIFT Entry” method, except do
Guys, I appreciate the thoughtful responses. I've been taught the same stuff
about impredance transformation vs. electrical length, but I've also seen these
traps work.
Gary wrote: This measurement that you made indicates that the cable is a
quarter wave (not ½ wave) at 146.15 if indeed you do
Skipp,
I appreciate the value of the high-Q VHF notch can, but that's a mighty big and
expensive first-line troubleshooting tool compared to a 2.5-inch pieve of coax
and a tee.
But, yes, agree with all.
73,
Paul, AE4KR
- Original Message -
From: skipp025
To:
My coax is RG-8M, similar to RG-8X. I couldn't find a
published velocity factor for M, but thought I remembered
.87. RG-8X is .84 (not .66). I cut a piece off an old scrap
cable (with connector) to 41 inches, measured from the tip of
the PL-259's center pin to the cut point, as a
Jeff: please sweep the other stubs you mentioned, so
we have something for comparison. Might as well do all
the varieties possible, and tabulate the results at
both 900 and the FM band.
Considering how easy it is to make such traps, perhaps
a short article could come out of it? You could add it
Paul,
Curious who makes the RG-8M you have.
Jeff, the cable is Tandy. In the '80's, the Tandy Wire Cable RG-8M was much
better than their own full-sized RG-8, and they'd sell you 20' off the roll at
the store. I used it in many mobile installations when there wasn't time to
mail-order
At 03:34 PM 01/12/08, you wrote:
Hi, Anyone here tried using a TS64 after a voter. I can see were
decoding would chop in and out, as it changes between site selected,
but thought we would ask the group.
Randy
Short answer: It shouldn't.
Long answer
The user's PL encoder is the source,
This may be a silly question, but what is the RF connector called on a
GM300. Is it a miniture UHF?
Thanks,
Bernie
yes
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bernie Hunt
Sent: Sunday, January 13, 2008 3:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] RF Connector for GM300
This may be a silly question, but what is the RF connector called on
Affirmative!!
Charlie
It is not the class of license the Amateur holds, but the class of the
Amateur that holds the license.
Charles Mumphrey
Amateur Radio Station Kc5ozh
Repeater System:
Rowlett Main: 441.325 MHz + 162.2
Dallas: 441.950 MHz + 162.2
Rowlett II: 441.950 MHz + 110.9
Rowlett
Bernie,
The industry-standard term is Mini-UHF.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bernie Hunt
Sent: Sunday, January 13, 2008 1:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder]
Look for the three 10 ohm reistors in paralell, R14, Rr154, R156
from colector to emitter of Q 5 the pass transistor. Increasing their
value will reduce the so-called Complete charging current.
http://www.repeater-builder.com/motorola/genesis/mva/mva-schematic-
2.gif
I use a 20 to 35 ma trickle
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