I expect wiki will answer it better than I but the amps are not linear so do
not increase signals at a flat rate .
To: Repeater-Builder@yahoogroups.com
From: lar...@hotmail.com
Date: Fri, 6 Feb 2009 05:16:17 +
Subject: [Repeater-Builder] Re: Hamtronics Helical Resonator Preamp or Advanced
R
Here is a true Hamtronics Helical Resonator preamp for 220 MHZ and 440 MHZ
http://www.hamtronics.com/pdf/Manuals/HRA.pdf.
73
W4CSO
- Original Message -
From: Barry
To: repeater-builder@yahoogroups.com
Sent: Thursday, February 05, 2009 11:52 PM
Subject: RE: [Repeater-Builder
--- In Repeater-Builder@yahoogroups.com, Barry wrote:
>
>
> What he is saying is , a lower gain preamp aplifies less noise in
relation to the signal so the audio sounds better
>
Not trying to be superpicky here, but this is something I need to
understand better... Why, and how, would the lowe
The RAD should be in the receiver audio path not the transmitter path
Ken
At 07:16 PM 2/5/2009, ran...@farmtel.net wrote:
I am using a Zetron Model 48B as a repeater controller. Everything is
going fine except my addition of a Arcom RAD audio delay board. The
board is working great except now
Maybe a bit of both. The antennas are side by side. I am more than
familiar with diversity from my audio engineering days. I'll put the
antennas on a switch and try this and that. I suspect that a 6dB gain
antenna will yield the best all around performance. But then again
maybe just a 3dB stick
At 2/5/2009 17:35, you wrote:
>Fixed tuned helical front ends as found in many of the
>GE and Motorhead Radios (and repeaters) are often a few
>MHz wide.
The measured 3 dB BW of the VHF HB GE MVP is 2 MHz. 40 dB BW is 5.7
MHz. Passband insertion loss is 5 to 6 dB. The Mastr II & Exec II
fron
--- In Repeater-Builder@yahoogroups.com, "Bob Ricci" wrote:
Using three separate radios at the same
> location and "manual voting" we can hear that at one moment unity
> gain is better, while at another one of the other antennas is better.
Bob, are/were you using three radios connected to t
What he is saying is , a lower gain preamp aplifies less noise in relation to
the signal so the audio sounds better
To: Repeater-Builder@yahoogroups.com
From: lar...@hotmail.com
Date: Fri, 6 Feb 2009 04:47:11 +
Subject: [Repeater-Builder] Re: Hamtronics Helical Resonator Preamp or Advanced
At 2/5/2009 15:03, you wrote:
>With that short of a run I would be more concerned with the repeater being
>in the near field of the antenna.
>
>-Kevin
I've read other similar comments. Guess I've been lucky: the last 2 meter
system I set up has the antenna barely 15 ft directly above the
repeat
--- In Repeater-Builder@yahoogroups.com, "Joe Burkleo"
wrote:
If for example the site has
> a higher than normal noise floor a lower gain preamp will often times
> amplify more of the signal and less of the extra site noise, where a
> higher gain preamp may amplify both the noise and signal, givi
Try using a boot loader that can boot more than one operating system, such as
NTLDR, LILO, or GRUB.
Best Regards,
Chris Carruba (WQIK389)
CompuTec Data Systems
Custom Written Software,
Networking, Forensic Data Recovery
From: John
To: Repeater-Builder@ya
Joe
You can buy a basic repeater controller for (The Basic) $83.95 and it
has many features including
a pending ID timer, a polite ID timer and a bunch more. It all programs
with DTMF.
www.ics-ctrl.com
Brian
ka9pmm
Joe Serocki wrote:
>
> I have a GR300 with M120/M10 radios. Seems nice, puts
I am using a Zetron Model 48B as a repeater controller. Everything is
going fine except my addition of a Arcom RAD audio delay board. The
board is working great except now the CWID and status tones are not
transmitted.
The RAD is tied to the COS coming from the receiver to act as a gate to
e
> ANYTHING with a software tuned front end is considered
> broad when talking about hi-level rf site performance.
I wouldn't say "anything"... many receiver front-end filter
sections are designed to electronically adjust and optimize...
aka a "tracking receiver pre-selector front end". I have
The DV-200 is a voice storage board made by Palomar Telecom, Inc.
around 1992
They are no longer in business.
The DV-200, DV-64 and VS-100 were all Natural voice play back boards.
They were programmed using the opitional SDS-1000 speach development
system.
Dennis
web_magician wrote:
>
> --- I
need the new ver. of the cable the old one does not work with it.
- Original Message -
From: Joe
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 05, 2009 2:10 PM
Subject: [Repeater-Builder] Vertex VXR 5000
Does anyone know where I can find a VPl-1 programmi
Thank you for the advice. This is why I was going to go to a sielded
barrier strip so that I could easily wire separate connections and
add feed-through caps if needed. But nonetheless, I'll learn by
making mistakes and making adjustments.
Go easy on me, Lads, This is my first go at this. Remem
Why do you feel the need for a preamp?
Also, to check for desense, you need everything operational. Get someone
with a very weak signal to transmit while you disable the repeater
transmitter. If there is no change in noise on the repeater's local speaker,
you are OK. If the signal gets quieter,
ANYTHING with a software tuned front end is considered broad when talking
about hi-level rf site performance. That is why helical resonator front ends
are desirable.
-- Original Message --
Received: Thu, 05 Feb 2009 03:16:20 PM PST
From: "Bob Ricci"
To: Repeater-Builder@yahoogroups.com
S
"...the receiver in this application has a very broad frontend..."
Not quite. The radio is software tuned and aligned for the actual
frequency range in service. It is *capable* of the broad range of 134-
174. That is not to say that a preselector won't help an already
excellent receiver, but a A
With that short of a run I would be more concerned with the repeater being
in the near field of the antenna.
-Kevin
> I am blessed with my location and yes, noise can be high. I'll
>try without the preamp first and see where I'm at, and the use of the
>proper antenna will help. I've spent so mu
Very good, excellent points Eric. I might add that the receiver in
this application has a very broad frontend. You NEED a receiver
preselector for best performance.
"Eric Lemmon" ...> wrote:
> Rick,
> You made some very good points. I can offer two comments: For
> hookups within the repeater ca
I did post a schematic that is compatable with the VXR-7000 on the
repeater builder site.
On Thu, Feb 5, 2009 at 12:10 PM, Joe wrote:
> Does anyone know where I can find a VPl-1 programming cable? Seen some
> on Ebay but they are listed as not working with the VXR-7000, are the
> pinouts differan
--- In Repeater-Builder@yahoogroups.com, "kb4mdz" wrote on
Thu Feb 5, 2009 at 2:40 pm:
>
>
> Graced with a Palomar Telecom DV-200 board; apparently it's a voice
> storage board, but I have no docs; I guess Palomar Telecom went out
of
> business sometime after 1992.
>
> Anyone have a half a c
Does anyone know where I can find a VPl-1 programming cable? Seen some
on Ebay but they are listed as not working with the VXR-7000, are the
pinouts differant from the mobile ham radios to the repeater the VPL-1
is supposed to work with?
Purchased a UHF repeater to run on Echolink, planning on
Thank you all for some excellent advice for a first-time repeater
builder. I have decided to move the antenna to the other side of the
house and push it up 60 feet. My home sits about ~15 feet below the
road, so this will give me a net gain of ~45 feet. I'll feed it with
hard line and do it rig
Skipp,
Your VHF Syntor is the 40 watt model. The 2511 transistor at Q802 was used
only in the HLD4125A power amplifier. According to the Syntor manual
6881043E40 (still available for about $21), the variable-output exciter
supplies 1.5 watts maximum drive to the PA. Some components in the PA we
I used a program called (I think) Boot Camp.
Joe M.
John wrote:
> MCH wrote:
>
>> Dual boot is the only way I know of...
>>
>
> What's the best way to do a dual boot?
>
> John
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
MCH wrote:
>Dual boot is the only way I know of...
>
What's the best way to do a dual boot?
John
On Thu, 5 Feb 2009, skipp025 wrote:
> So... can anyone quickly tell me the drive level?
IIRC, it's somewhere between 200 mW and 1.125W. +33dBm I think. The last
stage of the exciter sets the power out for the radio, just like the
Mitrek. A 45W PA can be turned down to 25W to run for the end of
Hi Eric and the Group -- Thanks for your comments and yes, Rg-400u is a good
substitute as well. I completely forgot about that one -- old age I guess
LOL!
73 - Rick NU7Z
On Thu, Feb 5, 2009 at 11:05 AM, Eric Lemmon wrote:
> Rick,
>
> You made some very good points. I can offer two comments:
Rick,
You made some very good points. I can offer two comments: For hookups
within the repeater cabinet, use RG-400/U coax instead of RG-142/U. RG-400
has a stranded center conductor, while RG-142 has a solid steel center
conductor that breaks easily when repeatedly flexed.
Regarding the Verte
A photo of the entire PA may help someone identify it better. Looks like a
resistor. If it's one of the resistors I'm thinking of, it might be cheaper to
replace the entire board because the final transistors may be blown. But, it
can't be certain without more information. And I'm not that much
It's not clear (literally) which component in the pictures is suspect.
However, the N1254A amplifier was never intended, nor is it suitable, for
repeater service. It was designed as an accessory for the MX300
ConvertaCom, where its duty cycle was very low, and it was fed just 4 to 5
watts. The fa
Re: Syntors at the salvage yard.
Drive level to the 45 watt VHF PA?
Yesterday we made it over to a longtime friend's Government
Surplus Buyer/Seller/Dealer location/warehouse. He's got a
great deal on LaMarche rack mount battery chargers if anyone
is seriously looking for one.
In
Hi All -- Here is my take on the preamp vs no preamp situation -- and with
Vertex repeaters --
First -- Preamps are not the solution to most of our troubles, in fact it
has been my experience over the years that they are more trouble than they
are helpful
I agree with Skipp and others when it is s
Hi Ralph,
> Ralph wrote:
> I have never seen or used a Hamtronics preamp. I don't
> know anything about their specs or how truthful they
> are. Maybe some one out there in the great bits might
> have an answer. Skipp? Eric? anyone??
I'll answer up to the anyone label...
Through the years
Mike,
What band is this link on, and what RX-TX separation is used?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michal Smialowski
Sent: Wednesday, February 04, 2009 7:57 AM
To: Repeater-builder
I was thinking the same thing. It sounds like the poster's RX has good
sensitivity as it is. LMR400 and antenna too close to repeater may be
causing desense, thus the "indication" that receive isn't working as it
should. Get rid of the LMR400 first and check for desense. If it's still
there, mo
I agree. I recently moved a 2 meter repeater to a temporary location
with approx. 25 feet of coax and have problems. I had to move the
repeater cabinet around until I got rid of the desense. A better site
is in the planning, but we need to get rid of some snow first.
73, Joe, K1ike
If your
Most sites will NOT allow RG214 to be used outside. Use 1/2 hard line for runs
less than 50-75 ft
- Original Message -
From: "Jeff DePolo"
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 5, 2009 6:31:22 AM GMT -07:00 U.S. Mountain Time
(Arizona)
Subject: RE: [Repeater-
> Again, 20 ft. of 7/8" for 2 meters is an unnecessary expense.
> 20 ft. of
> RG-214 has only 0.5 dB of loss @ 146 MHz - quite acceptable for a
> first-rate system, and it won't cost you that much even if
> you have to buy
> it @ retail $$.
>
> Bob NO6B
If your repeater cabinet and the anten
I expect that two voted receivers is part of the solution. I have
decided to either track down the commercial tower owner up the street
whose tower is not registered with the FCC and put the repeater there,
or move the antenna to the other side of the house and push it up 60
feet. In this case
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