What is the difference in the formats? Pilot tone?
It looks like the SEA repeater is based on two mobile radios, so the
chip I am working on should be compatible with most of their
equipment, as long as it uses the MC145158 synthesizer.
I saw a repeater on there with a dutch auction, but I belie
What power levels have you seen the drift issue at? I'm not going to run more
than 30W into these units.
On Thursday 05 May 2005 19:22, skipp025 wrote:
> You will notice the MA UHF Isolators drift
> with heat a lot more than largers current
> dual port products.
>
> Instrument tuning is not the
Pay attention to what you buy. The 220 stuff is
found under SEA, Intek, Securico, Midland and LMR
"Linear Modulation" brand names. Again there
are two ACSB formats in use and they do not
talk to each other.
I know of a group of "people" running around with
surplus ACSB units on simplex/tal
You will notice the MA UHF Isolators drift
with heat a lot more than largers current
dual port products.
Instrument tuning is not the best option,
except maybe to get it in the ball park.
They are tuned just like dual port telewave
types. Never trusting one specific method,
I use both the t
Anyone have an extra one of these repeaters they are willing to
sacrafice for experimentation purposes?
Seeing as 4K00J3E is an aceptable emission in the ham bands it has
been decided to leave the modulation type the same (ACSSB). This
would allow use of the surplus HT and mobile radios currently
Does anyone have a tuning procedure they could share for the Microwave
Associates 7R011T dual-stage UHF Isolator? I have 2 of these tuned on 454 and
462MHz. I've never attempted to tune isolators so any tips would be useful.
Can these be tuned with a tracking generator/spectrum analyzer?
Steve
I have uploaded it to the site, but no link from the index yet. Mike
will add the link when he can, but until then, go here directly for the
file:
Thanks to all involved in getting this to my site so quickly.
Kevin
Mike Perryman wrote:
Duane, et all...
I just emailed a copy
Say Kevin;
The hard line in question that you have for a single
antenna ok you also have a duplexer, now you remove the 2 items and use the
same line for one antenna no problem correct ?
My guess is that the conduit is probably making contact at some point; just
as a loose pa
Matt
The low band equipment that has noise blankers receive on a nearby
frequency and use the impulse noise that it sees to reduce the noise on the
channel if interest. They invert the signal from the nearbuy frequency and
apply it to the channel of interest. This would apply to broadband noise
>
>Has anyone ever used one of the MFJ-1025 noise cancelling type devices in
>their receive path to get rid of this type of noise?
How do you invert the phase of noise?
The only way such a device can actually work, is to pick up the
signal on it's antenna, invert the phase, and add it at the sa
My experience is that you have to remove the generation of the noise rather
than attempt to make noise canceling devices work.
What have others found?
-- Original Message --
Received: Thu, 05 May 2005 04:42:15 PM CDT
From: "Matt" <[EMAIL PROTECTED]>
To:
Subject: [Repeater-Builder] Noise
are you sure that the noise is entering thru the antenna and or feedline?
oh wait you said other buildings so I imagine it is..
ok have you tried a pass cavity to narrow the front end some more?
I have not used one of those mfj units but a friend has and he was happy but
not to happy with it's per
My 50MHz repeater is troubled by a high noise level on the site its
operating from - my noise floor is around -100dBm!!
The source of the noise is all the digital equipment in the other buildings
on the site. I have approached the owners of this equipment to try to get
them to screen their cabl
if you're a light eater...
http://hersheys.eprize.net/take5giveaway/
while 5,000,000 last: don't dally.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL P
The conversion to FM or a change to the Amateur Range
is not practical. They are ACSB repeaters and there
are 2 types... depending on who's format you have.
Using ACSB is anoter story... It works just killer
with a 20 watt radio going many times the distance
a similar power FM signal.
The r
Typically older systems had high stability ovenized oscillators
(0.001ppm at VHF or slightly better at uhf). The newer systems are
synthesized and locked via the 1ppm pulse from a GPS. This allows
something like 0.1ppm while three satellites are in view of the
GPS RX. Most systems are co
Duane,
et all...
I just
emailed a copy (pdf) of technote 1000-6 to yourself, Mike (WA6ILQ) and Kevin
(W3KKC). If it fails to arrive, please let me know... file is
7.383Mb..
Mike
-
Mike
Perryman
Back in the 1970's several of the European broadcasters experimented
with simulcasting with multiple transmitters on the same frequency. It seems
to me that they settled on 50 htz for an offset (carrier frequency
difference) between adjacent transmitters. This is low enough to not be a
pr
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