Don't forget the FCC rules...in this case, I am only to assume (knowing
MCH's identity) that this is taking place in Western Pennsylvania. That
being said, my question is, if the repeater is coordinated by a
governing body (WPRC) why would he/she complain about RC operations?
The FCC rules,
Keep in mind that he believes repeater operation in 52-54 MHz will cause
him interference. I already suggested the 50.800-51.000 MHz RC band.
I have also mentioned that repeaters have been operating on the 52-54
MHz band for decades, coexisting with RC operations. I suggested that he
has
I didn't want to play the coordinated vs uncoordinated card with him at
this time, but that would dictate that he is primarily responsible for
resolving any interference problems - including frequency selection on
his part. There is no way there could be any interference to the
coordinated
On Sun, 11 Oct 2009, MCH wrote:
BTW, he also wants to 'compromise' by offering to relocate the
repeater off the 52-54 MHz segment so they will not impact his RC
operations. Some compromise, huh?
Call a radio shop and get a quote for what it will cost to change the
frequency of the repeater
I operated an RC Aircraft on 53.5 for quite a few years, and the receiver in
the model was wide open. The transmitter used on/off keyed pulses, with the
carrier on the air most of the time and short interruptions (200 milliseconds)
of the carrier being the control method. A reverse pulse
The Academy of Model Aeronautics went through a standards change a
while ago. AM radios are no longer certified for exactly this reason.
If he's using radios that don't meet modern performance standards he is
invalidating both the airfield and his insurance.
I'd like to know how he determined
Good info.
BTW, the repeater isn't even on the air yet.
Joe M.
Oz-in-DFW wrote:
The Academy of Model Aeronautics went through a standards change a
while ago. AM radios are no longer certified for exactly this reason.
If he's using radios that don't meet modern performance standards he is
Can you give me a lead as to what I'm looking for?
Joe M.
Oz-in-DFW wrote:
I'd also suggest he reread the regs on model control in the ham band.
Oz
Can you define very cheap?
Joe M.
Jim Brown wrote:
If the complainant is trying to control a model, there are lots of
options now that do not include a six meter frequency, with the new 2.5
gig systems very cheap. No more frequency interference between models,
since they can all
Hardly anybody used 50 MHz ham in RC anymore since 2.4 GHz digital came
about. Tell him to look at a new system. The cost of changing your system to
another channel would exceed the cost of a new RC transmitter by three fold.
Mike Mullarkey K7PFJ
6886 Sage Ave
Firestone, Co 80504
A nice system you can pick up for under $300 and even under $200 if you want
basic.
Mike Mullarkey K7PFJ
6886 Sage Ave
Firestone, Co 80504
303-954-9695 Home
303-954-9693 Home Office Fax
303-718-8052 Cellular
_
From: Repeater-Builder@yahoogroups.com
Tell him Tower Hobbies has the best deals on the web.
Mike Mullarkey K7PFJ
6886 Sage Ave
Firestone, Co 80504
303-954-9695 Home
303-954-9693 Home Office Fax
303-718-8052 Cellular
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf
So he is looking at $1000, as he has 5 channels/aircraft.
Does that include the TX and RX units?
Joe M.
On Sun 11/10/09 8:04 AM , k7...@skybeam.com sent:
A nice system you can pick up for under $300 and even under $200 if
you want basic.
Mike Mullarkey K7PFJ
6886 Sage Ave
The amateur R/C operator has 2 problems...he is using outdated equipment and
outdated frequencies according to the coordinating body for R/C. Of
course...being an licensed Amateur Radio operator he has the right to do both.
The beginning of the problem is with the outdated ARRL plan for 6 meter
Who is the coordinating body (bodies?) for R/C? Website?
Where can I find the frequency list and mode requirements online?
Thanks,
Joe M.
On Sun 11/10/09 9:09 AM , lenaw12 wa1...@amsat.org sent:
The amateur R/C operator has 2 problems...he is using outdated equipment
and outdated
It's hard sometimes to work out differences between hams when neither ham is
fully versed in the other's chosen activity.
My first exposure to real RC was my brother back in the 70s. he had an FCC
license just for RC.
He saved up to be able to carry rocks in his pocket.
Any time he went to a
No, that price is for a complete replacement - TX, RX and servos.
Unless his system uses mechanical reeds and germanium transistors all he
will need is an RX per plane (~$65) and a new TX, so buy a $200 Kit and
four RX's $500 tomorrow, $350 if you shop.
m...@nb.net wrote:
So he is looking
Hi again,
We are looking to replace that used antenna after getting 100 feet of new
Andrews 1/2 donated to our club.
Now I realize that the DB type antenna is the best, but we do not have 800
bucks to buy one.
So, my question is should we just get a new G7-144 to replace the used G7 or is
Buy a commercial one and cry once.
Failing to have the funds you may want to build a colinear out of coax
sections. It don't get much cheaper than that.
http://www.repeater-builder.com/antenna/wa6svt.html
tom
[Original Message]
From: W3ML w...@arrl.net
To:
W3ML wrote:
Hi again,
We are looking to replace that used antenna after getting 100 feet of new
Andrews 1/2 donated to our club.
Now I realize that the DB type antenna is the best, but we do not have 800
bucks to buy one.
So, my question is should we just get a new G7-144 to replace the
John,
It sounds like you already have a G7? How old is it and how does it
operate? I am trying to figure out how it stood up to your WX Elements. My
two cents
.In WNY on the highest hill in Allegany County I had and still
have a G7. I had it up for about seven years at 160 until I got a used
On the RB website at
http://www.repeater-builder.com/antenna/pdf/420-welded-yagi.pdf, Skipp
graciously posted the measurements for a welded 420MHZ link antenna. I was
thinking of taking a stab at building one.
Questions:
1.Anyone have a detail drawing or photograph detailing how the driven
Again, operating in the Ham Bands doesn't hold the R/C guy to these specs as he
can or might have rolled his own.
However the specs show good engineering practice which as an Amateur he should
aim toward. He really has no recourse except that others try to work with him.
Crystals are often
John,
My suggestion is simple: Find the money to buy a decent antenna. Unless
your time has no value, your gasoline is free, and you enjoy tower climbing,
don't mess with cheap antennas.
The great majority of available funds should go into the antenna, feedline,
and outdoor mounting hardware-
task 2 is
isolate ptt line from control logic by cutting trace next to j2 pin 6
can anyone give me a clue? as task one is remove r22 which is on j2 pin 6 and
there is no trace next to this connector
Thanks everyone for the advice.
When we got the antenna it had been up for 10 years or more at 350 feet.
The fiberglass on the coil section was practically destroyed and the joints
were very loose.
We cleaned all the corrosion off the metal, re-fiber-glassed the section to
seal it and used
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 every week/month/year. Are
No, this is VERY typical. The antenna is bad.
Chuck
WB2EDV
- Original Message -
From: W3ML w...@arrl.net
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, October 11, 2009 1:15 PM
Subject: [Repeater-Builder] Re: Antenna question
It still wobbles and I believe there is something
Agreed. This is a classic sign of an antenna that's gone bad, and unless
you've got a good isolator with sufficient load you're probably doing
bad things to your transmitter... not to mention all the noise you're
likely generating for other site users when you're transmitting.
Needs to be
That is the conclusion that I have come to as everybody has said that GE Mastr
II should not be bad.
Thanks and 73
John
--- In Repeater-Builder@yahoogroups.com, Matthew Kaufman matt...@... wrote:
Agreed. This is a classic sign of an antenna that's gone bad, and unless
you've got a good
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
At this point, you've got a the smoking gun. It's as good as DNA ;-)
Chuck
WB2EDV
- Original Message -
From: W3ML w...@arrl.net
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, October 11, 2009 2:33 PM
Subject: [Repeater-Builder] Re: Antenna question
That is the conclusion that I
Have a G7-144 on our ARMY MARS repeater here and has been up since 1998 with
no antenna issues. We removed the clamps and drilled holes after tuning the
antenna to our frequency and used sheet metal screws to secure the tubing.
The antenna is mounted on the top of a building about 180 ft.
Your assertions are true as far as they go, but AMA insurance is then
invalid, and most other insurers follow their lead. The AMA standards
are the litmus test for insurabilty and represent 'good practice'
If the guy is rolling his own, he would understand enough to avoid this
problem entirely.
Have you ever seen 53.400 or 53.500 MHz used?
Also keep in mind that changing the frequency is not an option for him, as:
1. He is using 5 of the 9 6M RC frequencies available on 6M.
2. He believes that any repeater within 100 kHz is in his passband.
3. He doesn't want a repeater anywhere in
Hi
What type of cap. filter IC is used in AP-50 audio processor?
Regards
LA4PMA
Does anybody know how to field tune an sg217 omniodirectional antenna? I moved
the radials down and got a better SWR but not sure if this is the correct way?
Thanks
Mike VE7SML
Greetings all,
I joined this group because since earning my license I've wanted to set up a
repeater. I think I'm getting close to that now. Let me tell you what I
have and what I think I need. I ask that all of you smart, experienced
repeater owners would help me along in my path. Please
At 04:54 PM 10/11/2009, you wrote:
Have you ever seen 53.400 or 53.500 MHz used?
Not part of the usual coordinated frequency set
Also keep in mind that changing the frequency is not an option for him, as:
More accurately, it not what he *WANTS* to do. His options, however, may vary.
2. He
I am in the market for (2) UHF 438-470 Maxtrac or Radius mobiles. I would
prefer to have 16 pin radios but if you have some 5 pins at a bargain price
make me a price on those as well. I would need them to have the mobile mounting
brackets if possible. No need for a speaker or microphone. I
Eric, right off, I'll challenge the assumption that you need 25 miles
separation. You'll have too many users who can her the output but not get in,
and vice versa. A mile or two should be plenty.
Linking via the internet can be done, but making a ham repeater reliant on two
internet
Eric -
Have you been to the Repeater Builder website yet? There are lots of articles
there to assist you in learning more.
25 miles separation for 6 meters is way too much, however, I'm not sure what
the minimum recommended separation is for a split site. This is somewhat
dependant on the
Wattmeter
ME-82/U (military version of M. C. Jones Elect Co model MM-625). 50 - 600
mhz,52-ohm, 120w (metered). Tested OK, unmodified, good condition.
From an estate. Price: $60.00 plus shipping from northern Florida.
No extra charge for packing and taking to shipper (UPS?USPO).Pictures
Standard broadcast AM is 10KHz, and is wider than most other
forms of AM
(except CB, where they will do anything they want with the signal).
Standard AM *audio*, in the US, is low-pass filtered at about 10 kHz, so the
RF bandwidth is about 20 kHz (double sideband).
CB is substantially
So an AM signal (20 kHz) should only be slightly wider than a NBFM
signal (16 kHz), and the receiver, properly designed, should work fine
with an FM signal 30 kHz away that is 20 miles distant? (even
line-of-sight?)
Joe M.
Jeff DePolo wrote:
Standard broadcast AM is 10KHz, and is wider than
It is a custom chip, manufactured to our specifications.
Kevin Custer
la4pma wrote:
Hi
What type of cap. filter IC is used in AP-50 audio processor?
Regards
LA4PMA
I Definitely agree, go with a commercial antenna built to perform for may years.
Another good omni antenna is the ComTelco XL series antennas. I have several of
these up and working very well in both VHF and UHF Ham and commercial.
Matthew Kaufman ... wrote:
Given that last statement, I
Maxtrac and Radius mobile radios only come in the 449.9- 470 mHz frequency
range. So if you need 440 band you want a GM300 radio.
--- In Repeater-Builder@yahoogroups.com, iam4thapack iam4thap...@... wrote:
I am in the market for (2) UHF 438-470 Maxtrac or Radius mobiles. I would
prefer to
It might be worth while to build a couple pole L/C band pass filter
for the 6m model band.
Still About the only reasons I can see for using 6m:
1W transmitter power could be useful for drones and aircraft with 440
ATV back haul.
Gain somewhat more protection from 72 MHz operators. see again the
No, the number of channels in an RC system refers to controlled functions
of the aircraft, not RF channels. For example, a plane with rudder,
elevator, ailerons, throttle, and retractable landing gear would need 5
channels. The system still only occupies ONE RF channel.
George, KA3HSW /
--- In Repeater-Builder@yahoogroups.com, W3ML w...@... wrote:
Now I realize that the DB type antenna is the best, but we do not have 800
bucks to buy one.
You can do FAR better than that price. Primus Electronics, Joliet, IL.
800.435.1636. I have no connection with them other than
John,
You may want to look into Morad Antennas. They make a 10db 2 Meter antenna that
works very well.
From www.morad.com
VHF-146 10dB High performance 2 meter VHF 10dB gain @ 146 MHz #9114
$593.00
I have had a pair of them up on the Oregon Coast for 20 years with top support
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