Seems rather insane to feel the need to operate an RC Airplane at
frequencies that are known for ducting/skipping and actually being
somewhat functional in NLOS conditions - it screams I want to be
interfered with!. 2390-2400 MHz seems about the right place to run an
RC airplane thats not
Kris Kirby wrote:
On Sun, 11 Oct 2009, Thomas Oliver wrote:
Buy a commercial one and cry once.
What he said. Give until it hurts, but a DB-224 or a Super Stationmaster
with upper brace are a necessity in environments where ice damage is a
possible. Do it once, do it right.
Or do it
Perhaps you need two Ford Explorers? :) Theres a lot of them to be
found dead for scrap prices. Delete the driveshaft(s) and add a tow
bar. Nice inconspicuous repeater platform!
2m RX - 900/1.2 link to other SUV - 2M TX
If the link radio TX was very low (few hundred mW?) a smallish deep
3M Mastic tape?
Just remember, it'll end up sticking to anything else you stick it to
*eventually*, often in ways that are quite amazing and not reasonably
removed. I suggest a layer of standard electrical tape between anything
you care about and the mastic tape layer (and another layer of
I think the larger problem is a lack of standardization in receive
antenna systems for broadcast FM.
The late 60s/70s brought along ignorant antenna designs, like the
windshield-integrated dipole and the 45-degree swept-back dipole. Now
we've got even more ignorant designs like the 45 degree
From what I've gathered from on-site reports and the press, they'd much
rather the ham guys get out of the way so they can pull in their
kickback-paying overpriced corporate suppliers in ASAP to collect as
much DHS/FEMA money as they can get (and kick back...)
Ham guys are useful for
Around here, it raised the cost of tower rental which caused all the
local PD/FD/etc traffic to move to the water towers!
JS
kc8fwd wrote:
Hello,
Has anyone had experience with repeaters at water tower sites now that
homeland security is involved? I would like to hear your experience.
My views on this:
#1 - If you want a closed repeater then you should get a private
repeater pair coordinated in an appropriate private-communication pool.
will happily assign you a private repeater pair for a reasonable price.
Plain and simple. Amateur radio is not a replacement for a cell
The FCC sucked up *all* his gear vs just the gear he was using to break
the law, which I believe is allowed since the defendant was a licensed
operator of some sort. While my radio geek side likes this, my US
citizen side kinda freaks out at the idea...
The problem with the $24k FCC fine is
Not that impressive really. Whats all this crap worth, maybe $20k? Not
really that much money. FM broadcast parts pop up in rather strange
places these days for cheap since theres really not much legitimate
commercial market for a boat-anchor transmitter.
You'd think someone smart/slick
Theres a lot to account for in this:
A side-mounting on self-standing towers with significant amounts of leg
angle will reduce the 'total blockage' of the antenna in any direction
at one time. As long as one dipole is visable on your antenna you can
still calculate for that one dipole's gain
Now if they could tax for unused/held spectrum.
JS
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Plack
Sent: Thursday, April 30, 2009 7:19 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Taxes On Antennas
by a strobe. It also shouldn't be causing a
problem/reaction with the WISP gear (it may be causing damage to it!) so I'd
definitely find out what is going is going on with the strobe.
Good luck!
Jacob Suter
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com
The serious question is
does the county have the legal right to prohibit
such operations?
Radio transmissions are federal jurisdiction only, at least from every
document I can quickly Google up.
How many ham radio operators actually transmit more than 3 hours/day on
shortwave?
JS
I agree entirely on the RF part of your article.
But. Digital modes somehow eliminate feedback? Echo cancelation exists but
a great deal of the time it fails miserably. You end up with
voice-frequency delayed retransmission in the audio which IMHO is harder to
understand 'through' than
Even Times Microwave disagrees with you.
JS
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Patrick Patterson
Sent: Friday, March 20, 2009 3:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: LMR-400 and Belden
I suspect you could use this for your needs:
http://app-rpt.qrvc.com/
and a USB-equipped Linux capable system - doesn't need much horsepower since
you're not forced to additionally compress the audio.
I suggest using a small 'embedded' type Linux-running system, like the
Ubiquiti
It matters a lot when you're looking to purchase an antenna.
All UHF/VHF antennas are a compromise. Get what you need or get both and
run multiple feed-lines or an RF switch.
JS
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On
Sounds mechanically similar to Times Microwave LMR-400 to me. I agree with
the other poster on using silver crimp-type connectors. I don't like the
cheaper chrome/nickel plated crimp connectors. The threaded portions tend
to flake when being screwed/unscrewed, which leads to odd results.
I
Narrow-banding is making Japan and China rich (they don't make many radios
in the USA anymore) and giving hams a whole lot of equipment to pick
through.
JS
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On Behalf Of skipp025
Sent:
Is this the reason for the move to UHF? Back when I lived in the city I
never really saw much/any 'ghosting' on UHF stations, but horrible ghosting
on some VHF (all the transmitters were within a couple miles of each other,
so it wasn't an issue of transmitter/receiver site). Seems like if the
I find it horribly inaccurate since it doesn’t take into account receiving
height. What height are they calculating for? Set-top first-story height?
Rooftop? Tower top? At the dirt? I know they didn’t compensate for the 20 ft
altitude change between the end of my driveway and the front
How much RF does it take to get a clear NTSC picture? Usable?
I know the local cable tower tried to get at least a -20 dBm signal (!!!) on
analog TV inputs.
Most DTV converter units with published spec's need between -82 dBm and -86
dBm at the antenna jack on the back of the unit to capture a
Outlook needs a 'trigger lock' on the send button... Also, I have no idea
why outlook decided to add a bunch of crap to my email. Guess I should be
using a decent mail program!
edits below:
C Most preamps I run into are at least 10 years old. Sure they might still
work, but RF transistor
Seriously...
What is today's market for pagers? I can't imagine there's any real reason
for them to continue to exist. If the FCC can force you to quit using your
perfectly good 25 khz rig, force the multi-billion-dollar-a-year OTA TV
industry onto HD, or the zillion other examples of the FCC's
Here in East Texas (near Crockett to be exact) I have to use APRS to see if
my 2m antenna/rig still works. I'm RX only (no license) so I can't see if
the area's listed repeaters actually still work. My old Kenwood TR7400A
doesn't have PL anyways :)
One of these days I'll get around to taking
I suggest a Linksys PAP2-NA (an unlocked ethernet-based ATA)
I personally use vitelity.net for my business's voip service. I tested
Teliax with good results also. If all you need is termination (outgoing
calls) you're only billed per minute (and it's not like the average
autopatch is THAT
Are these units plugged into the same circuit? I'm guessing the wireless
internet gear installed has a dirty power supply or a large amount of
vhf-band noise being pushed back down.
A lot of cheap wall-wart power supplies (or cheap Chinese 'project'
supplies) are crap. This is getting
I'm guessing that'd be the national weather service transmitter at 162 MHz.
Close enough to look like FM broadcast, but the ridiculous power
requirements aren't there. The NWS site north of me uses antennas that
resemble slightly smaller FM transmitter 'loops'.
FM commercial stations use very
Was this from shearing or vibration? If they're merely vibrating off, I'd
have to say this is an application for Loctite, blue grade.
The nice part with the blue stuff is you can inspect the torque and/or
dismantle the tower later without having to use a torch. Higher grades of
Loctite are
Err, I meant, coax center pin and ground. Oops.
JS
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Jacob Suter
Sent: Monday, October 20, 2008 12:17 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder
DC Grounded, in my experience, means the center pin and the coax will show
a dc short when tested with a DMM.
Lightning? Corrosion? Manufacturing defect?
JS
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Cort Buffington
I've never worked with cans or repeaters, but I've witnessed similar issues
caused by oxidation/corrosion. Have you tried using a conductive grease on
the housing joints and the rods?
It appears silver-based grease is suggested for all applications above 50
mhz.
Good luck!
Jacob
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