Your math looks sound, Jeff, except I thought 1/2 Heliax
wasn't quite so
lossy @ 450 MHz (~1.5 dB/100 ft IIRC?).
Scenario 1: Preamp = 0.5 dB NF, antenna feeding 200' of
1/2 Heliax (3
dB loss @ 450 MHz @ 1:1 VSWR)
1.5 dB per 100 ft versus 3 dB for 200'. I think we're in agreement on
ensemble953039 wrote:
Hi,
from the experiments carried out here in the U.K. on in-band and
cross-band portable and mobile repeaters vertical separation is
nowhere near as good as horizontal.This also offers the chance
to get the recieve antenna in a null from the
At 2/12/2007 09:45, you wrote:
Hi,
from the experiments carried out here in the U.K. on in-band and
cross-band portable and mobile repeaters vertical separation is
nowhere near as good as horizontal.This also offers the chance
to get the recieve antenna in a null from the
--- In Repeater-Builder@yahoogroups.com, Mike Morris [EMAIL PROTECTED]
wrote:
At 04:56 AM 02/12/07, you wrote:
Peter,
Thanks alot.
I downloaded the manual from the Repeater Builders site but the
pages that show the schematic are blank. Let me know
N3GH
George
Unfortunately we are
I would think you'd be best served by getting the duplexer ASAP. If
your intent is to have a smaller, portable, quick to set up
repeater... the duplexer allows you to eliminate one antenna
feedline, sets up more quickly, and works immediately without antenna
jockeying, tuning, etc. (assuming
At 2/13/2007 06:28, you wrote:
Your math looks sound, Jeff, except I thought 1/2 Heliax
wasn't quite so
lossy @ 450 MHz (~1.5 dB/100 ft IIRC?).
Scenario 1: Preamp = 0.5 dB NF, antenna feeding 200' of
1/2 Heliax (3
dB loss @ 450 MHz @ 1:1 VSWR)
1.5 dB per 100 ft versus 3 dB for
At 08:36 AM 2/13/2007, you wrote:
If Joe Ham were serious about weak signal reception, he'd mount the
preamp at the antenna. Otherwise, 3 dB is already a lot of loss to
tolerate for weak signal work; what's another dB?
---Not just the loss but those 3 dB of feedline loss translate to an
I bought an import made battery load tester off ebay for under
$10. The tester even has a meter indication. I added a small
fan to move air through it and use it as a high current load
where desired. Sometimes I use it as a series resistance.
I also use heating elements out of dead hair
Has anyone tried to combine DB224E DB408 on the same
mast?
Well yes... I'm doing it. They use the same mast but not the
same feedline. If you needed to use a common feedline I would
look at a commercial diplexer first... mostly for the higher
power level capacity. I've used Comet and
Skipp,
Thanks for the reply. As I stated, I need to maintain a low profile. There
is a 2 meter 7/8 line on the tower. The antenna is too high in
frequency; therefore the return loss from the antenna is about 4dB. I have
a DB-224E that I'm going to replace the one on the tower with. I also
At 10:09 AM 2/13/2007, Ken Arck wrote:
Have a customer with the following issue:
Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM
radio xmtr site.
Make that 100,000 watt (at least the claim is 100K)
Ken
Have a customer with the following issue:
Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio
xmtr site.
Issue: Very low level audio of radio station appears on Mastr II's
xmtr (yes, external controller). Repeater owner hasn't fully
explained what very low level means. But
Nope, they are small metal strap/bar material formed to be
resistors. I bought a number of battery load testers off
ebay real cheap. Can't build them for the price I can buy
new units. Our global Wal Mart Economy.
cheers,
s.
Bob M. [EMAIL PROTECTED] wrote:
I wasn't sure if those load
Question: The only way I see this happening is due to some AM
component on radio station's transmitter.
Thoughts?
Virtually all FM transmitters have some residual/undesirable AM components.
If the AM follows the applied FM modulation, it's referred to as synchronous
AM, and is usually
If Joe Ham were serious about weak signal reception, he'd mount the
preamp at the antenna. Otherwise, 3 dB is already a lot of loss to
tolerate for weak signal work; what's another dB?
Us northeastern Joe Ham types don't like climbing the tower during the
middle of the January contest when
In a message dated 2/13/2007 11:04:58 A.M. Pacific Standard Time,
Cruising7388 writes:
In a message dated 2/13/2007 10:28:27 A.M. Pacific Standard Time,
[EMAIL PROTECTED] writes:
I bought an import made battery load tester off ebay
for under
$10. The tester even has a meter
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
At 2/12/2007 09:45, you wrote:
Hi,
from the experiments carried out here in the U.K. on in-band and
cross-band portable and mobile repeaters vertical separation is
nowhere near as good as horizontal.This also
Thanks for your input, I was hoping to hear from someone who had
experience with this kind of rig. I've been trying the vertical
antenna separation tactic, which *in theory* puts the antennas in each
others' nulls, but I think the reality is that there's enough pattern
distortion, signal
* Question: The only way I see this happening is due to some AM
component on radio station's transmitter.
Thoughts?
I've got one site with similar problems. MastrII repeater, in a metal
cabinet, grounded, bonded quite well. Shielded audio cables, ARCOM RC-210
controller (shameless plug
how does this group run?
I've getting posts out of sequence... the here's a weird one.. (~)
post showed quite a few responses before the actual post showed up.
I'm on yahoo, and its a yahoo group. How does this work, and what
would it take to see that messages show up in order and on a timely
They will never be in Order, because everyones Internet Provider is
Different and send things out that get bogged down. Now I know this was not
a great Answer, I am not that Computer savvy, but someone on Here can
explain it in More Tech terms without this Becoming into a big thread.
Happy
Welcome to Yahoo's lousy group and e-mail system.
That's just the way it is. If you want it to be
better, you'll have to take the service off of Yahoo
and get a company that can do stuff properly to run
it.
I've posted messages on Friday and not seen them come
back to me until Monday.
I've seen
radiomog wrote:
how does this group run?
I've getting posts out of sequence... the here's a weird one.. (~)
post showed quite a few responses before the actual post showed up.
I'm on yahoo, and its a yahoo group. How does this work, and what
would it take to see that messages show up in
A much faster internet with faster mail servers at YahooGroups.
Joe M.
radiomog wrote:
and what
would it take to see that messages show up in order and on a timely
basis?
I'm on yahoo via a T1 and I'm seeing your reply, but not my initial post.
how would an ISP be the issue? Does this reflector not reside on Yahoo?
Don KA9QJG [EMAIL PROTECTED] wrote:
They will never be in Order, because everyones Internet Provider
is Different and send things
On Tuesday 13 February 2007 14:51:42 mch wrote:
A much faster internet with faster mail servers at YahooGroups.
Joe M.
radiomog wrote:
and what
would it take to see that messages show up in order and on a timely
basis?
The situation is pretty complicated. There are a lot of reasons
At 2/13/2007 08:22 AM, you wrote:
Thanks for your input, I was hoping to hear from someone who had
experience with this kind of rig. I've been trying the vertical
antenna separation tactic, which *in theory* puts the antennas in each
others' nulls, but I think the reality is that there's enough
A transmitter can be transmitting a FM carrier with a significant
amount of incidental AM.
It is pretty widely known that incidental AM is caused by unoptimized
transmitting antennas and transmitters. The result can be both in-band
and out-of-band spurious FM products. This can make stereo
It's not unheard of for email to get 'lost in the mail', either.
The speed of your connection is only one issue, and a minor one at that.
Another issue nobody has mentioned so far is the fact that some people
have their clocks set wrong. This can be ahead or behind - minutes,
hours, months, or
At 12:31 PM 2/13/2007, you wrote:
A transmitter can be transmitting a FM carrier with a significant
amount of incidental AM.
---I didn't think there'd be enough incidental AM in a commercial
broadcast xmtr to be a factor here but I guess I'm wrong. Thanks
Ken
Brian,
I very familiar with those radios (small ICOM Land Mobile Dealer)
one
solution is to try a small preselector on the receiver
.
I have two F121s in the back of a fire dept rescue vehicle with antennas
about 3 feet apart and it works fairly well. The FD has told me they can be
several
Anyone have info regarding the DB-9 accessory
connector on the back of these radios? I'd suspect
that the VX2000, 3000, and 4000 series are similar.
I've searched the web. Naturally there are no detailed
photos or any info available from the Yaesu Vertex
Standard (or whatever name they're using
--- In Repeater-Builder@yahoogroups.com, Ken Arck [EMAIL PROTECTED] wrote:
Have a customer with the following issue:
Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio
xmtr site.
Issue: Very low level audio of radio station appears on Mastr II's
xmtr (yes, external
I get the same thing. My email is Bellsouth, therefore I can't expect any
better. Yahoo + Bellsouth = POS.
Fred N4GER
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of radiomog
Sent: Tuesday, February 13, 2007 1:31 PM
To:
go to this groups file section, I just posted a pdf from the manual of
that connectors info. The radio itself is a db-9 female..
dave
--- In Repeater-Builder@yahoogroups.com, Bob M. [EMAIL PROTECTED] wrote:
Anyone have info regarding the DB-9 accessory
connector on the back of these radios?
Perfect! Exactly what I needed to know, and then some.
It answers a bunch of questions.
No other replies/posts needed now.
Thanks.
Bob M.
==
--- na6df [EMAIL PROTECTED] wrote:
go to this groups file section, I just posted a pdf
from the manual of
that connectors info. The radio itself
--- Brian Rau [EMAIL PROTECTED] wrote:
Thanks for your input, I was hoping to hear from
someone who had
experience with this kind of rig. I've been trying
the vertical
antenna separation tactic, which *in theory* puts
the antennas in each
others' nulls, but I think the reality is that
Yeah, I have a bunch of the vx2000's. I like the little boogers. The
bummer is that the COS line is not programmable to operate with CTCSS.
It is always a carrier indicator, even if the radio is in decode. If
it were otherwise, I'd be using them for more IRLP and echolink
projects. I use maxtracs
Hell, I could spend a week on top of a mountain with an Oscilloscope,
Spectrum Analyzer and function generator and still not trace down what
is actually happening.
Survey says:
Incidental AM from a weak tube in the FM tranmitter final stage
coupling to DC power leads as an antenna and then being
Several years back our local radio station on 99.3 Mhz has a AM transmitter on
1520 Khz. They began to get into all the 49 Mhz phones, radios, as well as
hitting some of the commercial frequencies in the aircraft and 150 megs. The
tech went out, and after several days of trouble shooting,
At 12:37 PM 02/13/07, you wrote:
It's not unheard of for email to get 'lost in the mail', either.
The speed of your connection is only one issue, and a minor one at that.
Another issue nobody has mentioned so far is the fact that some people
have their clocks set wrong. This can be ahead or
Thanks. That's good to know. Too bad they didn't come
out with a signal that follows the CTCSS. Maybe you
could find something like an audio enable signal that
DOES follow coded squelch. That's what we use on
MaxTracs.
Bob M.
==
--- na6df [EMAIL PROTECTED] wrote:
Yeah, I have a bunch of the
You're right Fred. Andrew bought DB Products. But wait, DB Spectra
does antennas and duplexers that DB Products used to do and that
Andrew didn't want. DB Spectra is the company that used to
manufacture the products like duplexers for DBP.
--- In Repeater-Builder@yahoogroups.com, Fred
Ken;
I can only tell you what worked for myself and a friend w another
repeater. Both repeaters were/are located on hi-power FM broadcast
towers. Both FM broadcast radio transmissions cud barely be heard on
the outputs of the repeaters (only when the rptrs were tx'n, under
the tx audio). Both
When the tubes get weak it becomes an issue. On a 1000 watt
transmitter I have seen the power output needle swing between 80% and
100%, This would be 200 watts of AM. Of course that is after 21 months
of non-stop FM (CW) service. Kinda like a stupid trucker with a 100W
linear, that will get into
Two FM transmitters 90 degrees out of phase equals AM. It is not too hard to
have phase shifts in equipment on the receiving end of the interference and
multiple paths in the equipment.
73
Gary K4FMX
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL
What do the folks on the group recommend for a 2M power amp for a
repeater with an exciter capable of 10-25W output? New, used, modded,
otherwise. I am probably going to be replacing an older Henry that was
modded and did not have a tuned input...(spur city).
Scott NA4IT
we have 2 VX2000 new in the box still for sale
1. 148 to 174 25 watts VHF
1. 450 to 470 25 watts UHF 40 channel
$75.00 each and shipping cost
1. 450 to 470 25 watts UHF demo unit $50.00 and add shipping
John
- Original Message -
From: na6df
To:
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