Come on guys. Is it really necessary to quote the whole Digest when
replying to a thread? Ever heard of snip?
This morning, digest #7424 was 183kb, 139 pages long! Jeesh!!!
Al, K9SI
Inside every commercial broadcast transmitter is the Jesus Stick that
is used to ground out everything before sticking your hand in the
transmitter.
Al, K9SI
[SNIP}
They were also called Jesus nuts by my coworkers, probably named in a
spontaneously outburst by some guy who was about to
Ah, yes, the (in)famous 567. It could be quite good at what it was designed
to do. The datasheets and application documentation were actually very
helpful. Being TTL compatible they stressed the power supply with current
spikes so a bunch of caps were needed on the supply buss near the chip.
Sounds like George might be living in a microwave oven. Maybe time to do
an RF exposure test?
Al, K9SI
Re: how far
Posted by: George gueorg...@yahoo.com gueorgui2
Date: Sat Apr 24, 2010 5:45 pm ((PDT))
ok the antenna is from cell site 14dbm 4-element in a plastic housing, the
Got my First Phone in 1973. It has generated several employment
opportunities for me. However, having an Amateur license has opened even
more opportunities.
Got out of the Air Force in 1974 and went looking for a job in broadcast
radio. One local station was looking for an engineer.
HAL's number is 217-367-7373. Great folks to deal with.
Al, K9SI
John,
You will save yourself a lot of grief by using real transformer
isolation at each end in addition to balanced lines. The $12 dollar ones at
RS will work fine for communication audio frequencies. If you want to go
first class find some WE111 repeat coils.
For wire CAT 5 will work
One could point out that placing a small inductance to ground in series with
the ungrounded radiator and feeding the junction of the two is quite similar
to tapping up the grounded radiating element to attain a match.
Practically speaking, people have been using 1/4 wave whips on vehicles and
a series
transmission line with a shunt reactance can get a impedance match to a 50
Ohm system.
I would be happy to submit a Smith Chart with the appropriate series
transmission line and location of the shunt stub illustrated.
a.
snip
Al Wolfe k...@... wrote:
The straight skinny about the beta
The straight skinny about the beta or hairpin match can be found in
a QST article, April 1962, by Gooch and Gardiner. It explains how this
matching scheme works. The driven element is shortened making it capacitive.
Then the inductive reactance of the hairpin or beta section re-resonates
Al Wolfe wrote:
Have a Phelps Dodge 526 UHF duplexer that's missing the cables from
the
tee to the cans. Google came up with one vague reference where someone
thought these cables were 12 inches long. Is there a chart or formula
somewhere to determine their proper length?
Thanks,
Al
Have a Phelps Dodge 526 UHF duplexer that's missing the cables from the
tee to the cans. Google came up with one vague reference where someone
thought these cables were 12 inches long. Is there a chart or formula
somewhere to determine their proper length?
Thanks,
Al, K9SI
Thanks, Doug, Skip, and all, for a bunch of ideas about using a PC for a
controller.
Al, K9SI
The other day some of us were discussing replacing the controller in one
of our local repeaters. It is presently an NRHC-4. While throwing ideas
around someone suggested why not just use an old PC and sound card. Then we
could add bells and whistles as needed. This got us to thinking that
Have seen this several times where a transmitter went spurious. The worst
have been Johnsons. It's often temperature related, at least the frequency
of the spur. A spectrum analyzer and a directional antenna are your best
tools. A portable scanner is also very handy.
In one case we tracked
The repeater there in Fairfax, Va on 224.100 has the best audio of any
repeater I ever heard. It is a Kendecom. I dare anyone to tell me that
they can tell the difference between the INPUT audio and the OUTPUT
audio. Very natural, unprocessed, and a pleasure to listen to. - Mike
Then the
Ah, yes, the famous Red Book. I wore out my first copy back in the
late 60's - early 70's. It was the only Motorola information I had to go on
for many years but quite adequate for ham conversions and a general
understanding of what it took to get these radios working. A classic.
Al, K9SI
Jeff,
My dad was a part-time electrician and used friction tape a lot. I
watched him many times twist #14 or 1#12 wires together about an inch, then
solder them with a big soldering iron he had heated with a blow torch. Then
when joint cooled he would wrap it with a rubber tape that was
Pity that the guy selling all this stuff is in China. I think I'll pass.
Al, k9si
Re: ATSC pilot frequencies for sig. gen. alignment
Posted by: wb6ymh freebsd...@hotmail.com wb6ymh
Date: Tue Sep 8, 2009 6:56 am ((PDT))
--- In Repeater-Builder@yahoogroups.com, wb6ymh
Back in the late 60's or early 70's we tried this on one of the stations
I was involved with. CP can work with separate antennas but only if the
vertical and horizontal elements are in the same vertical axis and fed in
quadrature or 90 degrees out of phase. And the SWR needed to be
Won't happen with a properly set up system. Think and squelch.
Since there are only four repeater pairs on ten shared with everyone,
shame on anyone for using carrier squelch there.
Because CTCSS falses on the random noise.
Been there, done that, gave
away the t-shirt.
Al, k9si
Originally Decon was just a mixture of corn meal and portland cement,
hardly dangerous poisons. The principle was that rats and mice cannot
regurgitate what they have eaten. Then the cement would harden and the
rodent would starve.
Somewhere along the line Warifin, a blood
This is more of a FWIW comment. When I was in the USAF back in the
1960's we were not allowed to solder any wire splices in airplanes but
rather, used gas-tight crimp connections for the job. The logic was that
when stranded wire was soldered the solder would wick up to a point in the
wire
The amp is a UHF PA off a mobile rig, and I needed about
50 feet of RG58U to attenuate the signal from the repeater
into the amp module.
Not good, probably better to bypass (not use) the 15 watt
amplifier and drive the external amp direct from the exciter.
Not a thing wrong with using a
A friend of mine ran into the same issue with some UHF Fujitsus.
Couldn't get them below 450.000. He wound up changing the master reference
crystal. However, the results were not particularly useful as the channel
spacing was no longer exactly 5 kHz anymore and the five meg offset was
One trick we have used many times is to replace the fuse with a light
bulb for testing the trigger point of the over-voltage crowbar. Or put the
light bulb in series with the SCR's anode. Cheaper than a bunch of fuses and
easier on the power supply. Automotive bulbs or even headlamps can be
value so that when the circuit cuts out with
the
transmitter active, it won't turn back on when the battery voltage
recovers.
Of course, this could be tailored to taste.
Scott
Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Rd
Boswell, PA 15531
- Original Message -
From: Al
Don,
Low battery voltage shut-down can be done quite simply using three or
four parts: a normally open contact relay, a resistor, and a cap. The
battery goes to one side of the N. O. contact and the load (repeater?),
power supply, and relay coil to the other N. O. contact. The other side of
Most of the advice given here about taping antenna connections and the
techniques has been right on. However, I've been using Scotch 88 for sealing
connectors since about 1970 as it is twice as thick as 33+. Supposedly the
same material, just thicker.
I was also taught to spray the
Ian,
A pair of big schotky(sp) diodes works very well for what you are trying
to do with very little voltage drop. Or just get a battery isolator at the
nearest RV place. But then I don't know how many RV places there are in
Biloela.
The negative side of the batteries are tied together
Ron,
I've often used All-Thread for U bolts and V bolts, you know, the
continuously threaded rod often found at the local hardware store. The
all-thread is easily wrapped around a piece of pipe or angle by putting one
end into a vise and inserting the other end part way into a short section
Royce,
I have found a few hi-band circulators on ebay. Most there are for
microwave but once in a while the lower frequencies ones show up.
I've also found some at hamfests. Picked up one at Dayton this year for
440.
Some are fairly broad banded and some are very narrow. Some have
Probably any broadcast engineer could make a CD recording of the duck
farts from the EAS machines at every broadcast facility in the country. This
played into a signal generator should simulate NWS tests nicely.
Al, K9SI
John,
Ebay is your friend here. Look for Mini Circuits there and you will
find dozens of suitable units. I've gotten several two-way splitters there.
Typical and theoretical loss is 3 db, not usually a problem following a
preamp.
The TV type splitters do work as well but can be a bear
Skipp,
I'm very surprised at your experience with clear Krylon. I have been
using it quite successfully since 1964 in many hundreds of commercial as
well as amateur antenna projects. It's been S. O. P. to hose down all
connections and hardware with it after antenna structure and electrical
Tom,
Probably the simplest circuit would be to find an old Amperite time
delay N.O. relay and put it in series with the PTT line. Also, any
industrial electrician could find you a plug-in time-delay relay. Check
Grainger or Mouser for time delay relays.
The simplest would be to find
Actually, the UHF (450 to 470) mobile Micor usually uses an IF of 11.7
Mhz. or 11.8 where multiple receivers are used. A 11.7 Mhz. oscillator is
mixed with the receiver injection frequency for transmitting simplex and a
16.7 Mhz. oscillator for the most common 5 Mhz. offset. The 405 to 420
to know.
73, ron, n9ee/r
From: Al Wolfe [EMAIL PROTECTED]
Date: 2008/03/24 Mon PM 04:36:54 CDT
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: 24 vdc to 12 vdc
This is a very common issue in aircraft. The most obvious question is
does your jeep use 2 each 12 volt batteries
This is a very common issue in aircraft. The most obvious question is
does your jeep use 2 each 12 volt batteries? If so, simply connect
your radio across one of 'em.
This is done all the time but is a very, very bad idea. Ever hear of
Kirchhoff's law? Check it out. It's a very quick way to ruin
Rob,
Never use LMR-400 in a repeater system where you transmit through it. It
would be OK to use in your receiver to duplexer jumper but not for the
transmitter to duplexer jumper. Supposedly, the dissimilar metals of the
foil and braided shield can create broadband micro-arcs when
Keith,
Some of the local guys here had a similar problem and setup as you on
ten meters. It turned out that the transmitter, even though several miles
away, was saturating the extender (noise blanker). Turning off the extender
on the receiver solved the desense problem.
These were not
David,
I suspect that the issue is 104.9 mhz energy coming down the outside of
the feedline and into your receiver. As others have mentioned the maxtrac
has a lot of plastic. A shielded box with no unbypassed wires going in and
out may help. Ferrites on the feedline or a coil in the
Sorry, no. A shorted 1/2 wave stub at your frequency connected to a tee
would be a dead short at your frequency. A 1/4 wave shorted stub at your
frequency may work very well.
Al,
K9SI
A better option in your situation might be a shorted 1/2-wave stub at your
receive frequency. Using good
Having a very high-level flamethrower repeater around is not only
a great communications resource... if the hardware operates well
it's also impressive on your technical resume and a lot of fun to
operate.
So in other words, it's just an ego trip. These repeaters are commonly
known as
Skip,
You bring up a very valid point. I only know of two IBOC listeners in
the area. The local PBS station is trying to hype it so that may generate
some interest, at least for their classical music station. They hope to go
IBOC soon. Yes, keep those cards and letters coming in. How about
Eric,
What a coincidence! I too was Chief Engineer at WLRW which is actually
in Champaign, IL from 1974-81, 1986-92, and consultant from 1992 to present.
Thanks to your and Lee Hickok's (SK last Fall) efforts we have had very few
power issues. Of course it did take thirty years to get the
Thanks, guys, for all the ideas. I really don't like the idea of
ripping into a virginal Quantar because some users' radios aren't
transmitting enough PL tone.
As for the VX6's they are not running in the narrow band mode, at least
on the ones that have been checked.
Although we
. Does the Quantar work
with other radio brands/models? Maybe it doesn't like raspy tones.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Al Wolfe
Sent: Tuesday, September 25, 2007 9:24 PM
To: Repeater
We recently replaced an aging UHF machine with a Quantar for a local ham
repeater. Now it seems that some users are not able to key up the system.
Turns out their radios (all VX6's) have fairly low tone deviation. Tests on
the Quantar show that it needs at least 300 htz to key it. This
It seems Ron, N9EE, is quite proud of the fact that his repeater doesn't
use tone squelch. Ron, you are most fortunate to be able to do that. For the
rest of us lets get real. From my modest station I can normally hear five
or six repeaters on 146.76. Using tone I can work any one of them
Normally, putting ANY concrete under a properly house bracketed tower is
a mistake. There used to be a Rohn letter out about it. Had to do with two
immovable objects, that is, the house and the concrete base and the motion
of the tower between them. Towers do flex in the wind and change
Interesting report on Newsline this week. (Report 1560, July 6, 2007)
Seems the local oscillator of a Hamtronics R901 receiver in Bakersfield, CA
was putting out enough 406 Mhz energy to be a problem for NOAA's rescue
satellite system on that frequency range.
Might be something to
Rusty,
A lot of us only transmit PL tone during COR. There is little reason to
send tone during ID's or the tail. For situations like Echolink, etc. it is
the only way to go. Just gate the ctcss tone with R-COR. Problem solved.
Al, K9SI
Maybe as a side question, can you run two CTCSS
Group,
I recently aquired a VoCom UHF amplifier, model UVC100-18R, with some
other stuff. It is presently tuned to 464 mHz, at least according to its
nameplate and its former usage.
Can it be easily tuned to 444 mHz? Is tech data available somewhere? It
seems that VoCom was
Re: Spectrum Communications
Posted by: Joel Nadler [EMAIL PROTECTED] nn6j
Date: Tue Apr 24, 2007 11:53 am ((PDT))
skipp,
thanks for the idea. Do you have any suggestions as to which compay to
order a receiver from. Our repeater is near other repeaters and we don't
want any rf
Not trying to be a spoil-sport, but since Mototrbo isn't a documented
public protocol doesn't it fall under the encrypted transmission
rules, and wouldn't be allowed in the Amateur bands?
Actually, Mototrbo is based on a European digital standard using TDMA.
Motorola is selling it here.
Re: Service Monitors with D-Star
Posted by: Nate Duehr [EMAIL PROTECTED] wy0x
Date: Mon Apr 23, 2007 1:24 pm ((PDT))
On 4/23/07, Shanon Herron [EMAIL PROTECTED] wrote:
There are several Death Star repeaters popping up in Michigan. The P25
repeaters have been around much
Guess I'm just lucky. I have used and use ARR preamps in all sorts of
situations with cavities and without, with many random pieces of feedline
and cabling, on bands from 29 to 470 mhz. and have never had an oscillation
problem. They have been very stable in my experience. (Of course, I never
Don,
I have been using UHF and N tees with the center conductor on one side
of the tee removed as RF sample ports for more than forty years. Also make
great way to inject RF into a system for receiver tests with the antenna and
other hardware in place. Cheap enough to leave in line for
Tim,
An old rule of thumb is that you get as many lobes in the pattern as the
number of 1/4 wavelegths from the tower. This was reflected in the antenna
literature in the old PD cataloges. At 1/4 wave spacing you get one fat main
lobe away from the tower. At 1/2 wave spacing you get a
Tony, et al.
1) Yes
2) I believe one of the main causes it that there are just too many
repeaters! This causes fragmentation of the users. Case in point: Here in
Champaign County, IL, there are presently three UHF machines and two VHF
machines. There have been at least three other two
Yes, the Vatican does have a lot of influence around the world.
Sorry, couldn't resist.
73,
Al, K9SI
Re: coordination question for the seasoned owners
Posted by: Coy Hilton [EMAIL PROTECTED] ac0y8
Date: Tue Jan 23, 2007 2:57 am ((PST))
Contrary to some beliefs, putting CTCSS on a repeater DOES NOT MAKE
IT A CLOSED mschine!
Group,
As Coy said, CTCSS does not make a repeater
A long time ago I happened to find a crowbar bar made by Lambda at the
local TRW swap meet. I added it to a supply without built-in OVP to add
said protection to the equipment. I wonder if similar devices are
commonly
available somewhere? That a fuse on the output of an SEC-1223 I think
. Super Sataionmaster Disassembly
Posted by: Steve [EMAIL PROTECTED] spassmo
Date: Fri Jan 12, 2007 3:35 pm ((PST))
Anyone have info on the proper way to disassemble a VHF Super Stationmaster
antenna (PD220?) This one has 3 flat-head allen screws in the aluminum base
section about an
Ian,
If the PR-25 is anything like the PR-40 then it uses the ubiquitous 723
regulator circuit that has been around for 30 years. Most of the highly
touted Astrons use the 723 circuit so an Astron circuit might be a good
place to start. Data sheets for the 723 are available on the web.
From: Mathew Quaife [EMAIL PROTECTED]
Date: Wed May 3, 2006 8:19am(PDT)
Subject: Re: OT: 155.190 intereferes with Ham Radio Frequencies
You are right Gary, the last thing I want to do is get a police cheif
upset with the ham community, especially if it caused by something other
From: Dave VanHorn [EMAIL PROTECTED]
Date: Mon Apr 24, 2006 8:56pm(PDT)
Subject: Re: telco and ctcss tones
--- In Repeater-Builder@yahoogroups.com, DCFluX [EMAIL PROTECTED] wrote:
Here is an age old question that has yet to be answered satisfactorly.
What are the CTCSS frequencies
Date: Sat, 01 Apr 2006 01:30:03 -
From: n9lv [EMAIL PROTECTED]
Subject: Need Plan info on handheld coverage in Business Band for 60 miles
or so
We have four stores that is spread over nearly a 60 mile radius. The
first store is about 40 air miles from my store, and then from my
it is
to make.
73,
Dick W1NMZ
- Original Message -
From: Al Wolfe
To: Repeater-Builder@yahoogroups.com
Sent: 16 March, 2006 05:31
Subject: [Repeater-Builder] Re: 6mtr duplexer
Most of the discussion I've seen for the 6 meter Heliax duplexer has
been centered around using 1 5/8 Heliax
Most of the discussion I've seen for the 6 meter Heliax duplexer has
been centered around using 1 5/8 Heliax. Has anyone used 3 1/8 stuff?
Would there be any advantage to using the larger size? I have some
available.
Has anyone used the foam 1 5/8 instead of air line for a duplexer?
Date: Thu, 02 Mar 2006 14:51:03 -
From: Stephen Rice [EMAIL PROTECTED]
Subject: lightning arrestors
Hi all, I had a question that I believe some of you can answer! I have
a repeater with an antenna only about 20 feet off the ground here in
Florida and am now looking for a budget
Date: Sun, 05 Feb 2006 20:39:33 -
From: Dave VanHorn [EMAIL PROTECTED]
Subject: Comet GP-9
Question: I see that the top section is INSULATED from the rest of the
antenna. No mistake, no defect, it's built that way.
How then does that top section actually work?
Looks like a 1/4 wave
Perhaps we should note that Ian is talking about a radio service in
Australia. I doubt that discussions about standard repeater splits in the US
are particularly useful to him.
Al, K9SI
- Original Message -
From: Ian [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Chuck,
There is an old DOS program, rfs.exe, from rfspec.com that works OK. Old
and clunky but it's free.
73,
Al, K9SI
Date: Thu, 29 Dec 2005 09:08:43 -0500
From: [EMAIL PROTECTED] [EMAIL PROTECTED]
Subject: Intermod program
I'm looking for a decent intermod program. I'm aware of
snip you may consider drilling a 1/8 inch hole aprox 1/2 inch above earth
level.
Bad idea. While it is true that water will condense inside the tower,
the right way handle it is to install the tower so that water can drain out
the bottom by extending the pipe or base section far enough
Date: Wed, 28 Dec 2005 16:05:30 -0500
From: Mark A. Holman [EMAIL PROTECTED]
Subject: Re: Re: Tower Installation
Say AL W. I have a Q. what is the wind survival speed on a house bracket
? just curious?
most installs up here in MI. are cement our wind avgs. are 75 mph.
non-straight line
Doug,
For what you plan to do there is no reason at all to use concrete. Back
in the Sixties I helped install dozens of thirty and forty foot Rohn towers
for TV receivers and never used the first bag of cement when using a house
bracket. Many of these towers are still in use today.
Thanks to all who commented. Sounds like the tower top UHF preamp
project will go on hold. I have about 480 feet of 7/8 line and it would be
nice to overcome the loss but don't think it's in the budget for a while.
Merry Christmas,
Al, K9SI
Yahoo! Groups Links
* To visit your
Vincent,
Take everyone's advice about preselectors and preamps with appropriate
gain. Then go to ebay and look for Mini-Circuits there. You will find
probably dozens of suitable devices, with 2 to 24 or more ports. Many tend
to use SMA connectors which are excellent but not everyone can
Speaking of UHF preamps, does anyone have any experience/recommendations
for tower mounted preamps? I have a receiving only site at 425 feet AGL,
DB420 antenna, 7/8 line, that feeds five receivers at present. Tried an ARR
on the ground before the splitter but it seemed to overload from UHF
I think we've been had. This is obviously a joke isn't it?
73,
Al, K9SI
Date: Mon, 28 Nov 2005 01:10:07 -
From: us_communications1 [EMAIL PROTECTED]
Subject: Re: trying to build my first repeater
the fact that they are mobiles and the design of the power supply
make little
Jim,
As a general rule, you will get as many lobes in the antenna's pattern
as you have numbers of 1/4 waves spacing from the tower. That is, at one 1/4
wave spacing you get one major lobe away from the tower, two 1/4 wave
spacing (1/2 wave) gives two mojor lobes roughly perpendicular to
Don,
I am using a thermostat that I believe was for an attic fan in an
earlier life to control a fan in a repeater. It plugs into 120 VAC and is
mounted on the power amp heatsink. The fan only runs when the heatsink gets
warm and is needed. This may be overkill for your application.
Anthony,
You may have to put your receiver in a shielded box and bypass all the
lines going in and out. I had to do this with a UHF station receiver that
picked up cell phone transmitters several miles away, even with no antenna
on the receiver. Drove me nuts for a while.
Al, K9SI
At 8/3/2005 06:14 AM, you wrote:
Bruce,
One common method of combining two receivers is to use a coax tee at
the
antenna feedline and 1/4 wave pieces of 75 ohm coax from the tee to each
receiver. This can be expanded to four receivers using six pieces of 75
ohm
coax, but probably isn't
Bruce,
I don't think you will be happy with an amplified splitter from Radio
Shack. Your concept is valid but the RS amp will probably have much too high
a noise figure to be useful for off the air use in repeater service.
I would be leary of any Radio Shack device hooked to an outside
Bruce,
One common method of combining two receivers is to use a coax tee at the
antenna feedline and 1/4 wave pieces of 75 ohm coax from the tee to each
receiver. This can be expanded to four receivers using six pieces of 75 ohm
coax, but probably isn't worth the effort.
If the received
Nick,
Many states/regions have an SNP, or test pair, or nonprotected pair of
UHF frequencies for conceptual studies, experimenting, etc. If your area has
such a pair then that would be a natural for your mobile repeater.
That being said, please pay attention to the advice already given
As others have mentioned, the Moxy was the bottom of the barrel
Motorola radio. They came out about thirty years ago to compete with the
rice boxes that were showing up in commercial service.
They may be OK for playing garage repeater or maybe even some linking,
but I don't think I
From a digest reader,
Thank you, thank you.
73,
Al, K9SI
[ 7k of repeat-repeat-repeat snipped: hope y'all don't mind ]
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* To unsubscribe from this group, send an email
Walter,
See if you can find a local two-way shop with an old low band antenna
laying around. I found a two bay, 43 mhz unit for free. The 30 to 50 mhz
band is being abandoned by many users for cell phones and 800 mhz stuff.
Often the shops can't give away the equipment and have to pay to
Don't make this project a bigger deal than it needs to be. As long as
the repeater is a few degrees above the ambient temperature (even assuming
100 % humidity at ambient) then it will be OK. The standby power the
repeater uses will probably be enough to maintain this temperature
Chris,
The best thing you can do is make sure the temperature inside the
repeater stays higher than outside the repeater. This will lower the
relative humidity inside the repeater. In a similar situation I just ran a
60 watt lightbulb in the bottom of the repeater. You may want to seal most
OK, here's the deal about tornado detectors. This info circulated in the
ESDA wx spotting comunity back in the late 60's. Don't know where it
actually started.
Turn TV set to unused mid channel (5, 6. etc.) Set contrast to max.
Back off on brightness until raster (picture) just
Hi, all,
One of the few Dayton acquisitions this years was a Motorola APCOR unit.
Apparently it was designed for medical/EMT use and is supposed to be able to
do full duplex. Does anyone have any technical info on this unit they would
care to share? It looks like it might make a decent
I have a L1158A patch, also made by IAI, and no info on it. It has two
modular phone cords coming out of it as well as a cord marked radio. It was
once hooked to a low-band Micor base station. There is also a wall-wart
attached. If anyone comes up with any info I'd like to know as well.
73
Mark,
I don't know why you discount the idea of using a length of coax as an
attenuator. I have used coax many times for this exact application. For the
power level you mentioned you can wrap up a length of RG58 (or one of the
double shielded varieties) into a managable coil. Darn sight
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
I have two Measurements signal generators that if you talk into them it
modulates the signal. Have actually had QSO's on two meters using this
technique. Figured it must be a feature. Can be a challenge, though,
aligning a receiver with the volume tuned up very high.
73,
Al, K9SI
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