I think this comes down to personal preference. I know a lot of folks who will
argue that one or the other is better but they both do what they are supposed
to do. Some say there are a lot of falsing issues with PL and that DPL doesn't
false. In actual use, I have heard both false. Some say
One could point out that placing a small inductance to ground in series with
the ungrounded radiator and feeding the junction of the two is quite similar
to tapping up the grounded radiating element to attain a match.
Practically speaking, people have been using 1/4 wave whips on vehicles and
A'tank u viry much
Less than 1 Amp is the good news...
Now instead of building a 3 terminal LM-317 regulator circuit
do we want to instead buy a pre-made complete regulator board
off Ebay for about $7 and shipping?
A main switcher power supply or off a site DC source and the
electric bill
I tried posting this to a year-old thread, but I'm afraid it wont be seen! I'm
having difficulties in that when I plug my repeater cable between my two SM50s,
the transmit radio immediately goes into transmit. I am fairly certain I have
everything programmed properly, with Pin 8 programmed
One caution -
The 900MHz Motorola GTX series radios have a firmware
bug in them and will NOT do tone reverse burst at all.
The DCS side of the radio is just fine.
This is documented on the GTX pages at repeater-builder.
Since every 900MHz user radio that is in use started out as
a commercial
In response to your Gm300s as repeaters, I have
been using them for years without any problems,
power up full(with fan coming on at transmit) and
a 600
KHz spacing. I also have a pair of SM 50s working
as a repeater with a much wider spacing. It has
been operating for years now, without any
Hi
yes they do work, not intended for use as a repeater, even with
a fan running full pwr is risky, depends on what sort of rptr if
amateur then some of the overs can and do last 10 minutes or
more. Again if amateur with a 600Kc split the dupexer will cost
you a load of money
Steve
- Original
I'm wondering about the suitability of a pair of VHF GM300s as a repeater. Is
the shielding sufficient to allow 600 kHz between Rx and Tx? If not, what is
the suggested minimum?
Same questions for UHF SM50, but with a 5 mHz split?
lh
Steve,
So the reason for turning down the power is for PA protection or RF
suppression?
lh
On Thu, Feb 25, 2010 at 2:00 PM, Steve steve.m1...@tiscali.co.uk wrote:
Hi
they work OK but you must turn the tx pwr right down and
fit a fan or pa won't last long. It is down to the duplexer
Hi
they work OK but you must turn the tx pwr right down and
fit a fan or pa won't last long. It is down to the duplexer finding
a unit suitable at the right price will be almost impossible, the 5Mhz split
is ok as you can get cheap duplexers from Hong Kong
73
Steve
- Original Message -
At 11:23 AM 02/25/10, you wrote:
Steve,
So the reason for turning down the power is for PA
protection or RF suppression?
lh
PA protection.
One caution (from the Introductory Information about the
MaxTrac, Radius, GM300, etc radios page at repeater-builder...
Remember that the MaxTrac,
Build it yourself. Use an LM7808 and and series two 1N4001's to lift the ground
lead up by 1.4 volts. I know 7809's are around but the 7808 is much more common
and cheaper.
Bill
From: skipp025 skipp...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Thu,
On 2/25/2010 1:16 PM, Mike Morris WA6ILQ wrote:
As a 10% to 15% duty cycle radio the MaxTrac, Radius and
GM300 are designed to transmit for no more than 10 to 15
seconds out of each 100 seconds.
Re: Duty-cycle.
Is that really the engineering specification for duty-cycle, is it
really in
Hey Skipp,
I've just removed the AC supply from a SpectraTac receiver
shelf. Has a Micor RX a couple of cards. System draws
less than 200ma.
I used an LM317 (a couple of caps R's)... soldered the tab
directly to a piece of PCB material. Runs all day long with
12 input doesn't even get
OK, since we've activated the Wy Back Machine again, does anyone remember
the VHF high band West Coast Electronics remote mount mobiles?
I'm still looking for photos of the radio, especially an interior picture and
control head.
These were built in Los Angeles, used an 832A in the final
I have a tram titan 3 radio that I am looking for information on. I have the
manual and the radio does power on. from the manual it lists freqs. in 20 MHz.
I'm looking to sell it so any information about the radio is appreciated!
Hi
someone answered this but mainly for PA protection as most
mobiles are made for limited tx time. I made a UHF rptr with
2 GM300,s and an ICS controller, but I turned down the pwr to
just 3 watts and fed it into a 6dB gain ant so erp is around 12w
works well and gives the coverage I need. I will
A friend is looking for a 25 to 50 amp 24 Volt Power Supply. (GE or
Motorola type is acceptable)
Person looking is located in Eastern Washington but travels the entire
Northwest and could pick up so shipping wouldn't be a hassle if you had
something real heavy.
Puyallup Hamfest is on the
Hello Leroy,
How did you program the radios? In other words, using the software how
did you set up the Radiowide and Mode options in each radio.
Specifically the Options settings.
73, Joe, K1ike
Leroy A. M. Baptiste wrote:
.
I will be happy to share more info.
The Tram Titan original and Titan 2 were both high ene CB radios. The 3 may
also be a CB radio.
- Original Message -
From: Chris
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 25, 2010 3:58 PM
Subject: [Repeater-Builder] Tram Titan III 3 Information?
I checked and this is a CB radio with a 20mhz master systhesizer oscillator.
It might be capable of being moved to 10 meter ham band and it is an all mode
radio.
- Original Message -
From: Chris
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 25, 2010 3:58 PM
The Titans were all CB rigs. I suggest doing a Google search for the info.
73,
Kim - WG8S
I think the winner of the best response is Mark with the Rube Goldberg
statement followed by Kris with wonky and Lee with the plain old WHY?
Thank you all for your input. I appreciate the comments and the technical
advice.
My main motivation for doing this is A)to be different and weird... ie
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