<div dir="ltr">high noise floor is "normal" for 6m. I know someone that runs a high power (1200w) 6m repeater system. it has ~20 repeater inputs that are voted. His receive performance has diminished over the last few years, due to a continually rising noise floor on 6m, and also on his link frequencies.<div><br></div><div>one method he taught me to measure the noise floor at an input site: put a coax T on the repeater input receiver with a 50 ohm dummy load on one port, and a service monitor on the other port. See how many microvolts (dbm) it takes to open the receiver on his input frequency. Then disconnect the dummy load and connect the antenna to that port. Then see how many microvolts (dbm) it takes to open the receiver. It gives a good performance metric for the sites. some sites have become so noisy, he questions whether it's worthwhile to have a receiver there.</div><div><br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">
<p><span>--... ...--<br></span><span style="font-size:12.8px">Bob Mueller<br></span><span style="font-size:12.8px">K8MD<br></span><a href="mailto:bob@funautical.com" style="font-size:12.8px" target="_blank">bob@funautical.com</a></p></div></div></div></div></div>
<br><div class="gmail_quote">On Mon, Mar 6, 2017 at 4:54 PM, Greg D <span dir="ltr"><<a href="mailto:ko6th.greg@gmail.com" target="_blank">ko6th.greg@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
I took a quick listen to 6m with my Yaesu FT-847 and a simple dipole
strung across the second story eaves. No packet heard, but I note
the noise floor across the band is between S6 and S7, with peaks at
S9. Lots of digital sounding stuff, but even the "quiet" parts have
a high noise floor. Is this normal for this band now, or is it just
my location? <br>
<br>
Greg KO6TH<div><div class="h5"><br>
<br>
<br>
<div class="m_-1180372086916746559moz-cite-prefix">Jess Haas wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">I believe it is 50.62. 6 meter seems ideal for a
longer range fixed station messaging backbone. If we got some
smarter path routing involved we could get some real range out
of the system without being reliant on the internet.
<div dir="auto"><br>
</div>
<div dir="auto">If anyone is interested in setting something up
in southern california I could setup a station(igate,
digipeater whatevers needed) in culver city.</div>
<div dir="auto"><br>
</div>
<div dir="auto">-Jess</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mar 6, 2017 9:25 AM, "Earl Needham"
<<a href="mailto:earl.kd5xb@gmail.com" target="_blank">earl.kd5xb@gmail.com</a>> wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">We've talked about using 6 meters for APRS
in the past and I don't think it ever went very far. The
reason, in my opinion, that 2 meters has worked so well
for APRS is that it's on a common frequency nation-state.
That, plus the fact that 2 meter radios are so available.
<div dir="auto"><br>
</div>
<div dir="auto">IS there a common frequency for 6 meter
APRS?</div>
<div dir="auto"><br>
</div>
<div dir="auto">Vy 7 3</div>
<div dir="auto">Earl</div>
<div dir="auto">KD5XB</div>
<div dir="auto"><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mar 6, 2017 9:05 AM, "Robert
Bruninga" <<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">We
think that 6m APRS is an ideal applicataion...
especially when 100W<br>
mobile low-band surplus radios are so cheap. A guy
got 100 of them for $10<br>
each. But then he had to modify them and add TNC's.<br>
<br>
Although this is ideal for mobile for longer distances
than 2m, the problem<br>
is there will never be enough infrastrucuter for
travel out of area except<br>
in local areas that embrace it.<br>
<br>
A better idea for 6m radio is for emergency APRS
communications at all<br>
operatinos centers. Hams will want to use 2m and 70c
bands for voice and so<br>
we do not want APRS messaging and tactical situational
awareness objects to<br>
interfere.<br>
<br>
SO best to have 6m APRS at all emergency comms sites
as a 3rd band for<br>
interchange between all emergency comm sites. The
sites will of course,<br>
MONITOR 144.39 national frequency so they can see all
incoming APRS tactical<br>
situation, but their messaging between emergency
centers on 6m would not<br>
interfere with other voice ops on 2m and 70cm.<br>
<br>
Bob, WB4aPR<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:ve2gqf@gmail.com" target="_blank">ve2gqf@gmail.com</a>
[mailto:<a href="mailto:ve2gqf@gmail.com" target="_blank">ve2gqf@gmail.com</a>]<br>
Sent: Monday, March 06, 2017 10:46 AM<br>
To: <a href="mailto:WB4APR@amsat.org" target="_blank">WB4APR@amsat.org</a><br>
Subject: 6 m APRS<br>
<br>
Hi Bob,<br>
<br>
My name is Gilles, VE2GQF and live in Sherbrooke,
Québec and an aprs<br>
enthousiat since the begening !<br>
<br>
We are interested to try APRS on 6 m band in Quebec
province. Is it a good<br>
idea ? Is this mode on this band is always used ?
Internet seem to be have<br>
no large information about it ?<br>
<br>
I'm going to Florida in few days, is there always any
6 m APRS Igate near<br>
Washington and Georgia - If yes I will transmet APRS
6 m beacon in my trip.<br>
<br>
<br>
Thank's for your answer and sorry if my english is not
good, this is not my<br>
first langage.<br>
<br>
<br>
73's Gilles ve2gqf<br>
<br>
---<br>
L'absence de virus dans ce courrier électronique a été
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logiciel antivirus Avast.<br>
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