[Repeater-Builder] Re: New to 900mhz,, PL or DPL?

[wspx472]

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 there are interference 
problems with certain tones. This can be true in some situations. DPL will give 
you more choices since there are more DPL codes than PL tones. As far as I 
know, any modern radio designed originally for 900 MHz commercial use will do 
either well. I personally prefer PL because there are more after market devices 
for that format and it is easier to implement in some situations such as with 
phase modulated exciters. But it is still just my personal preference. Your 
Maxtrac should handle either format. 





--- In Repeater-Builder@yahoogroups.com, "kq7dx"  wrote:
>
> Hello to the group,
> I have had a couple of really nice hams try to explain this to me but I am 
> not getting it. Which is better. Most importantly which is better in a 
> metropolitan city with lots of RFI and noise on the bands. Particularly 
> 900mhz. I have seen mostly PL and just a few DPL listings so I am not sure 
> that it is RFI motivated for the selection. So which is best for a repeater 
> application.
> The receiver for the repeater will be a 800mhz Maxtrac converted to 902mhz. 
> Thank you for your help, and if this was covered on another post please let 
> me know. I am on a dial up and it is hard to research.
> 73s
> scott
>

[Repeater-Builder] Re: Ground plane yada yada

[Al Wolfe]

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 
ground planes successfully for probably more than seventy years now with few 
ill effects caused by SWR. The problem of the 36 ohm theoretical impedance 
of the infinitesimally thin radiator seems to have been mitigated by 
reality.

I believe this thread has run its course. Thanks to the moderator for his 
patience.

73,
Al, K9SI




Re: Ground plane yada yada
Posted by: "allan crites" wa9...@arrl.net wa9zzu
Date: Wed Feb 24, 2010 10:49 am ((PST))

In the gnd plane example the feed point is in series with the driven 
element, and in the example in which you are referring there is a tap up the 
driven element understandably to get to a higher impedance and the feed is 
in parallel to the driven element (as in a tap up an inductor in a resonant 
circuit) with with a series inductor, resonated with the series capacitor. 
There's a difference. One is series fed and the other is parallel fed. There 
is no doubt that the method you espouse is valid, but your comparison to a 
series fed element is not. One could also run a short section of coax in 
parallel with but spaced away from the driven element with the center 
conductor of the coax connecting to the tap on the element, and achieve a 
wider operating bandwidth. The coax feed can be shown on a Smith Chart to be 
the equivalent to the series LC for impedance matching purposes.

WA9ZZU

 

[Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?

[skipp025]

"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 from the Micor Power Supply should drop at least 
$20 per month. 

thank you! 
skipp 


> "Eric Lemmon"  wrote:
> During receive only, the draw is about 0.125 amperes.  During duplex
> transmit, the current draw goes up to about 0.355 amperes.  These numbers
> were measured on one Micor station, and I would expect the current draw to
> vary perhaps +/- 50 mA between various stations.  YMMV.
> 
> 73, Eric Lemmon WB6FLY
>  
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025
> Sent: Tuesday, February 23, 2010 10:26 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Micor UHF Repeater Base 9.6 vdc current
> requirement?
> 
>   
> 
> re: Micor UHF Repeater Base 9.6 vdc current requirement? 
> 
> Any of you Micor People know the actual total 9.6 volt supply 
> current requirement? ... as in removing the power supply and 
> running the equipment off battery power. The 9.6 vdc is still 
> required but at how much current? Anyone know the real measured 
> current value? 
> 
> thanks in advance for your reply 
> 
> cheers, 
> skipp
>

[Repeater-Builder] SM50 Repeater Cable Problem

[ad6nh]

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 for DPL/PL CS Detect and 
Active Low. I am using this cable from Ebay
http://cgi.ebay.com/Delay-Repeater-Interface-for-Motorola-GM300-Radio-NEW_W0QQit\emZ150095175361QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item22f25e9ec1
 and I'm wondering if it's not correct? This outfit also sells a "duplex 
cable", but I thought that only allowed the repeater to work in both 
directions, not necessarily achieve what you talk about below. I'm not trying 
to operate dscrossband - just a simple GMRS repeater. Thanks for any possible 
advice!

Phil - AD6NH/WQKP927

Re: [Repeater-Builder] Re: New to 900mhz,, PL or DPL?

[Mike Morris WA6ILQ]

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 2-way they all have both PL and DPL, so
the choice of PL tone or DPL code and the choice of which
tone or which code is up to the person who sets up the
system.

Since the GTX is a popular an entry-level radio you will find
a LOT of repeaters use DPL, and for what it's worth in some
areas DPL code 411 is considered an "open" code - i.e. if
the system uses 411 then it's an open system.

As to tone selection criteria, the CTCSS overview article (which
also contains some historical info) at repeater-builder has
some very cogent points - like you DON'T want to use
136.5 Hz or 131.8 Hz on any channel that you might want to
run DPL on in the future.
See 
There is also a chart of "legal" DPL codes at the end. Too many systems
are out there that use nonstandard codes.

Mike WA6ILQ

At 06:35 AM 02/25/10, you wrote:
>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 there are interference problems with 
>certain tones. This can be true in some situations. DPL will give 
>you more choices since there are more DPL codes than PL tones. As 
>far as I know, any modern radio designed originally for 900 MHz 
>commercial use will do either well. I personally prefer PL because 
>there are more after market devices for that format and it is easier 
>to implement in some situations such as with phase modulated 
>exciters. But it is still just my personal preference. Your Maxtrac 
>should handle either format.
>
>
>
>
>
>--- In Repeater-Builder@yahoogroups.com, "kq7dx"  wrote:
> >
> > Hello to the group,
> > I have had a couple of really nice hams try to explain this to me 
> but I am not getting it. Which is better. Most importantly which is 
> better in a metropolitan city with lots of RFI and noise on the 
> bands. Particularly 900mhz. I have seen mostly PL and just a few 
> DPL listings so I am not sure that it is RFI motivated for the 
> selection. So which is best for a repeater application.
> > The receiver for the repeater will be a 800mhz Maxtrac converted 
> to 902mhz.
> > Thank you for your help, and if this was covered on another post 
> please let me know. I am on a dial up and it is hard to research.
> > 73s
> > scott
> >
>
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>

RE: [Repeater-Builder] Pair of GM300 as a repeater

[Leroy A. M. Baptiste]

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
problems.
I will be happy to share more info.

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On
Behalf Of Steve
Sent: Friday, February 26, 2010 3:01 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Pair of GM300 as a
repeater

  

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 - 
From: "la88y" mailto:llhorlick%40gmail.com> >
To: mailto:Repeater-Builder%40yahoogroups.com> >
Sent: Thursday, February 25, 2010 4:46 PM
Subject: [Repeater-Builder] Pair of GM300 as a
repeater

>
>
> 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
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Steve]

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 Message - 
From: "Leroy A. M. Baptiste" 
To: 
Sent: Thursday, February 25, 2010 7:24 AM
Subject: RE: [Repeater-Builder] Pair of GM300 as a repeater


> 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
> problems.
> I will be happy to share more info.
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On
> Behalf Of Steve
> Sent: Friday, February 26, 2010 3:01 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Pair of GM300 as a
> repeater
> 
>  
> 
> 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 - 
> From: "la88y"   >
> To:   >
> Sent: Thursday, February 25, 2010 4:46 PM
> Subject: [Repeater-Builder] Pair of GM300 as a
> repeater
> 
>>
>>
>> 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
>>
>>
>>
>> 
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 

[Repeater-Builder] Pair of GM300 as a repeater

[la88y]

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

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Larry Horlick]

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  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 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 -
> From: "la88y" >
> To: 
> >
> Sent: Thursday, February 25, 2010 4:46 PM
> Subject: [Repeater-Builder] Pair of GM300 as a repeater
>
> >
> >
> > 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
> >
> >
> >
> > 
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
>
>  
>

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Steve]

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 - 
From: "la88y" 
To: 
Sent: Thursday, February 25, 2010 4:46 PM
Subject: [Repeater-Builder] Pair of GM300 as a repeater


>
>
> 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
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Mike Morris WA6ILQ]

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, M-series, Radius and GM300
are MOBILE radios, made with minimal heat sinks, and while
they can be used quite readily as a low-to-medium performance
repeater receiver, or as a link receiver, you can NOT use it as
a repeater transmitter or as a link transmitter without due
consideration to the normal mobile radio limitations on RF
power and duty cycle."
...and
"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."
...and...
"It's one thing to use a GR300 (or similar) in a shopping mall
environment to talk to the rent a cops or to tell housekeeping
to clean up little Johnny's spilled ice cream cone, but you
want something with a higher duty cycle as your primary
repeater."

By the way...
I've seen a pair of the radios used as a repeater and
there was more desense due to the cabling that came
with the Moto duplexer kit (the RF cables from
the radios to the duplexer) than due to radio case
leakage.

Once the cheap loose-weave braid cabling was replaced
with the good stuff (RG400 and good connectors) all the
measurable desense went away.

Mike WA6ILQ

Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?

[Bill Smith]

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 
To: Repeater-Builder@yahoogroups.com
Sent: Thu, February 25, 2010 9:58:50 AM
Subject: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current 
requirement?

"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 from the Micor Power Supply should drop at least 
$20 per month. 

thank you! 
skipp 

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Nate Duehr]

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 seconds/100?

The reason I ask is I've always chuckled at duty-cycles presented as 
percentages.

"But it only transmitted 15 days straight, out of 100 days!"

Anyone know what the EIA/TIA duty-cycle tests for 100% duty cycle that 
many repeaters meet, REALLY tests for?

Nate

[Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?

[tahrens301]

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 warm.  - Using it for a solar 6 mtr
RX site.

Tim  W5FN

[Repeater-Builder] West Coast Electronics (was Key Collection)

[hybridfan]

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 and had silver 
plated tuned lines in the receiver rf stages.

I know San Diego Yellow Cab used them in the early 60's. That's how we got our 
FM start down here. The model was MFM 15-150B.

Ken

--- In Repeater-Builder@yahoogroups.com, Kevin Custer  wrote:
>
> skipp025 wrote:
> >
> > Oh yeah..?  Got an Allen B. Dumont, (Fred) Link key in that collection?
> 
> My father had a Link FM transmitter on VHF - used a pair of 2E26's in 
> the final.  It was paired with a receiver, but I don't recall what it 
> was.  The receiver would get so hot it would burn up the tube sockets.
> Both were in a small Link cabinet, but the door wasn't lockable, as I 
> remember.
> 
> We did have a small/unstable DuMont oscilloscope - it sure wasn't a 
> Tektronix.
> 
> Kevin
>

[Repeater-Builder] Tram Titan III 3 Information?

[Chris]

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!

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Steve]

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 fit a better fan
when I get time. Being in the UK we are only allows 25w erp
so with a good ant no need to set tx pwr high. I also built a 6mtr
rptr using 2 low band maxtracs and did the manual pwr mod to
the tx unit, all great fun

Steve
  - Original Message - 
  From: Larry Horlick 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Thursday, February 25, 2010 7:23 PM
  Subject: Re: [Repeater-Builder] Pair of GM300 as a repeater





  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  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 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 - 
From: "la88y" 
To: 
Sent: Thursday, February 25, 2010 4:46 PM
Subject: [Repeater-Builder] Pair of GM300 as a repeater

>
>
> 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
>
>
>

> 
>
>
>
> Yahoo! Groups Links
>
>
>








  

[Repeater-Builder] Looking for a 24 volt power supply

[Larry]

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 schedule on 5th and 6th of March so he and I 
will be in Seattle/Tacoma area that weekend.

Anyone have anything they want to get rid of ?

Please email me off list if so. --- la...@thunderbolt.net

Larry - N7FM

Re: [Repeater-Builder] Pair of GM300 as a repeater

[Joe]

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.
>   

Re: [Repeater-Builder] Tram Titan III 3 Information?

[Jim in Waco WB5OXQ]

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 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!



  


--



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 9.0.733 / Virus Database: 271.1.1/2710 - Release Date: 02/25/10 
13:57:00

Re: [Repeater-Builder] Tram Titan III 3 Information?

[Jim in Waco WB5OXQ]

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
  Subject: [Repeater-Builder] Tram Titan III 3 Information?



  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!



  


--



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 9.0.733 / Virus Database: 271.1.1/2710 - Release Date: 02/25/10 
13:57:00

Re: [Repeater-Builder] Tram Titan III 3 Information?

[whensley11]

The Titans were all CB rigs. I suggest doing a Google search for the info. 

73, 

Kim - WG8S 

[Repeater-Builder] Re: dual band convertacom

[hitekgearhead]

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 I do 
like the "wonky" aspect of it. And B) I already have most everything installed 
in the car and have the two amplifiers on hand. All I need is a couple cables 
and the appropriate switch and/or duplexer/diplexer.

Also, on that note, hopefully you guys will forgive me if I used the incorrect 
term for the splitter/combiner. I have heard them called both duplexers and 
diplexers.


Maybe I will get even more weird and add a 10m and 6m Genesis HT to my 
collection and rig them all to work from the same MVA..



Thanks again.

Albert





--- In Repeater-Builder@yahoogroups.com, "Mark"  wrote:
>
> Albert,
> 
> I had a very similar installation as you describe in my car, and I used a
> dual-band brick PA with my setup.  5W VHF yielded 50W / 4W UHF yielded 40W.
> My biggest issue with the setup was they side contacts on my radios wouldn't
> make good contact all the time with the MVA, so I yanked it in favor of a
> dual-band mobile.  But I still have the MVA and the PA, just in case...  ;-)
> 
> Seeing you prefer to use separate PAs, you might want to consider two
> diplexers - one ahead of each PA to "split" the feedlines and then one
> behind them to "re-combine" them.  But to be honest, IMHO this is kinda the
> "Rube Goldberg" way of doing it, I think.  Compare prices - by the time you
> get the diplexers and other stuff, you may well be approaching the cost of
> one dual-band PA.
> 
> Mark - N9WYS 
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of hitekgearhead
> 
> I know I am going to get the singular answer of "WHY" but I really would
> like some technical input on this.
> 
> In my car I have an old Genesis series convertacom connected to a dual band
> Comet antenna. I often will swap my VHF and UHF HT back and forth and
> utilize the dual band capability of my antenna. It works pretty well.
> 
> What I would like to get some input on however, is how to run some power
> with this setup.
> 
> Of course the easiest would be to get a amateur dual band amplifier, but I
> already have a VHF and a UHF (N1275A and N1274A) amplifier.
> 
> What I would like to do is parallel these two amps with some kind of
> switching/duplexer setup so that I could easily switch from VHF to UHF.
> 
> My initial idea was to run an antenna switch from the convertacom to the
> amps so I can manually select which one the signal goes to. Then on the
> output side of the amps I thought about using an antenna duplexer on the
> output of the amps to feed the antenna. I was also thinking of running a
> switch to alternately select which amp was receiving DC power, but I don't
> know if that would be necessary. (Could I leave both amps powered on in this
> situation?)
> 
> So, does this sound about right or am I going off the deep end?
> 
> Thanks
> Albert
>

RE: [Repeater-Builder] Tram Titan III 3 Information?

[Michael Ryan]

All mode rigs don't make it on the repeater-builder's reflector.  CB rigs
either.  Best look for info on a CB on CB site.  - M

 

From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jim in Waco WB5OXQ
Sent: Thursday, February 25, 2010 10:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [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 <mailto:chrismollcdx1...@yahoo.com>  

To: Repeater-Builder@yahoogroups.com 

Sent: Thursday, February 25, 2010 3:58 PM

Subject: [Repeater-Builder] Tram Titan III 3 Information?

 

  

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!

  _  


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