HDTenEightyP/NetNews huggingface dataset:
From: gary@ke4zv.uucp (Gary Coffman)
Newsgroups: rec.radio.cb
Subject: Re: where to buy swr meter ?
Date: 18 Nov 92 16:37:56 GMT
Article-I.D.: ke4zv.1992Nov18.163756.10661
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group

In article <1992Nov17.223745.22702@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
>jxs18@po.CWRU.Edu (Jerry Sy) writes:
>: > any tricks from cb experts in the net ?
>
>Yes. Mount the SWR meter AT THE ANTENNA.  Mounting it at the tranceiver
>may produce misleading results. 

This could use some amplification. VSWR is a condition of the transmission
line. Theoretically it should be the same at *every* point along the line.
The two main reasons it may not be are both reasons requiring action be
taken. The first reason is currents on the *outside* of the coax. This is
very bad and will distort the radiation pattern and should be fixed. The
second reason is feedline loss. The loss of the line will cause the reflected
component of the signal to be weaker than the theoretical VSWR should be
for a given mismatch. For reasonable lengths of good grade coax at CB
frequencies, this should result in negligble VSWR error at the transmitter
end of the feedline. If it is substantial, then better coax should be 
installed since you are wasting power to heat the dielectric.

So, if you measure the VSWR at the antenna end, and again at the transmitter
end, and the readings vary by more than a slight amount, corrective action
is required. Remember that the only reasons you care about VSWR at all are
that the transmitter may not produce maximum power when it looks into a 
non-50 ohm load, or that the antenna may not be resonant at the measurement 
frequency which can *slightly* reduce it's efficiency as a radiator. Good 
grade coax will be perfectly happy with a VSWR as high as 10:1 and the power 
loss from this VSWR will be negligble for modest lengths of cable.

Gary KE4ZV
Newsgroups: rec.radio.cb,rec.radio.noncomm,rec.radio.shortwave,de.comm.ham,dnet.ham
From: rawass@rhrk.uni-kl.de (Alexander Rawass)
Subject: central question / FAQ needed
Organization: University of Kaiserslautern, Germany
Date: Thu, 19 Nov 1992 22:24:13 GMT


Hi,

I have some central questions about connecting
two hosts via some protocol, without using
the telephone-net :

I want to connect two or more hosts (running
Unix) with either TCP/IP or ka9q or something
by transmitting the data 'through the air'!

So I wanted to know, what hardware equipment
I will need, and I also wanted to know what
is the correct term for this (ham-radio?
packet-radio? cb?)

Anyway, I don't want to spend too much money
on the radio hardware (less than DM 300, that
are US$ 200).

I intended to use so called CB-units (don't
know the correct english term).


So, if you have some material about this
or if you can answer my questions or if
you can tell me where to find a FAQ for
tis group, please emal me or post to this
group...



Rawalex
--------------------------+--------------------------------------------------
Alexander Rawass          | "Life's a piece of shit ... when you look at it."
rawass@sun.rhrk.uni-kl.de | Monty Python's Life of Brian                     
--------------------------+--------------------------------------------------

-- 
Rawalex
--------------------------+--------------------------------------------------
Alexander Rawass          | "Life's a piece of shit ... when you look at it."
rawass@sun.rhrk.uni-kl.de | Monty Python's Life of Brian                     
Newsgroups: rec.radio.cb
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: where to buy swr meter ?
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Date: Sun, 22 Nov 1992 10:45:51 GMT

ah301@yfn.ysu.edu (Jerry Sy) writes:
: 
: >Yes - at least two. You could use a field strength meter or a grid-dip
: >meter (although a modern gdm would not have a grid to dip).
: >
: what is the procedure using a fsm ?

You are better off using the SWR meter. The field strength meter is likely
to be far less precise.

: the swr meter at radio shack has a female connector input saying Tx
: and another female connector saying Antenna.  Do I need anything else
: (say an extra cable ? since the antenna line has male and the cb has
: female)

Yes, you need a short cable to connect the CB radio to the SWR meter.
It will have male connectors at both ends. The proper place for the
SWR meter is right at the feedpoint on the antenna, but that is not
really practical on your antenna. Don't worry about it, for the short
length of coax you have, it won't matter.

Bill
From: gary@ke4zv.uucp (Gary Coffman)
Newsgroups: rec.radio.cb
Subject: Re: where to buy swr meter ?
Date: 18 Nov 92 16:21:52 GMT
Article-I.D.: ke4zv.1992Nov18.162152.10569
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group

In article <1eb3naINN8jo@usenet.INS.CWRU.Edu> jxs18@po.CWRU.Edu (Jerry Sy) writes:
>
>what is the price range of swr meters ?

Professional instruments range from $100 to several $1000s of dollars.
A nice cheapy that will work well enough for your purposes is in the
$10-$25 range from Rat Shack.

>where can I buy one that will work decently ? is it something one
>can construct from parts from a Radio Shark store ?

Building a VSWR meter that will give accurate results is not a job
for a neophyte. If you wish to try your hand, there is a design
in the ARRL Handbook using the micromatch printed transmission line
circuit that is fairly foolproof.

>is there a way to fine tune an antenna without using an swr meter ?
>any tricks from cb experts in the net ?

Sure. The *best* way is to tune for maximum field strength while totally
ignoring the VSWR. You don't care about standing waves anyway. The only
waves you care about are the ones going out to other radios. Your radio
*may* care about VSWR, but almost all units nowadays will reduce output
automatically when the VSWR is out of range. That'll show up as reduced
field strength, so you don't need to measure VSWR. 

Most cheapy VSWR bridges will also double as field strength meters so
you can still buy one of those. However, a NE2 and a small wire loop
will work as a field strength indicator. Simply tune for maximum
brilliance of the bulb with the bulb as far from the antenna as it
will still glow.

Gary KE4ZV
Newsgroups: rec.radio.cb
From: ad838@yfn.ysu.edu (Michael Rolfes)
Subject: REACT Team members
Organization: Youngstown State University/Youngstown Free-Net
Date: Mon, 23 Nov 1992 21:05:24 GMT


Are there any REACT team members out there?  Ohio Valley REACT
Inc is monitoring this area.... just like CB 9.


Michael P. Rolfes  OVR Unit #43, usr2879a@tso.uc.edu
**********************************************************
            Ohio Valley REACT Inc. #2601 
CB Channel 9 KHY-1303 ***** VHF-FM 151.625 WPBC-440.
 
Hamilton County Disaster and Emergency Services  
American Red Cross --Standard First Aid 
American Heart Association -- Basic Life Support Certified
**********************************************************
-- 
***********************
*Michael "Mike" Rolfes*
*usr2879a@tso.uc.edu  *
*Cincinnati, OH  USA  *
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Tue, 17 Nov 1992 19:32:53 GMT
Subject: Re: Basic Advice
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.radio.cb

> Nope. It may be a half-wave vertical, but it is not a half wave dipole.
> It is end fed, not fed in the middle. Look at the sensitivity of end
> fed antennas, you will see that it is high for all lengths.

It still might be a vertical half-wave dipole - remember the "bazooka"
design, in which the feed is *through* the end, with the feedline going
through a cylindrical element to the mid-point, and then the outer conductor
ties to the "pipe" you just passed through, while the inner conductor ties
to the upper element.  In this case, no radials would be required or
desired.  The point is, your blanket statement regarding radials needs
some disclaimers - there ARE vertical designs which fit the description
given but which SHOULD NOT be used with radials.  The first place to check
in this case, given that it's a commerical design, would be in the owner's
manual, or lacking that, a call to Shakespeare.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: john.denison@yob.sccsi.com (John Denison) 
Newsgroups: rec.radio.cb
Subject: CB ANTENNA + LIGHTNING ST
Date: 22 Nov 92 13:27:00 GMT
Distribution: world
Organization: Ye Olde Bailey BBS - Houston, TX - 713-520-1569
Reply-To: john.denison@yob.sccsi.com (John Denison) 

TO: cmeans@mcs213i.cs.umr.edu (Chad J Means)
-> I have a K40 magnetic mount whip antenna and notice that it picks up
-> a lot of "static" during lightning storms.  My question: "Is it a
-> good idea to use

You would most likely pick up static from lightning with any antenna on
CB. AM seems to be prone to lighting and other kinds of interference,
whereas FM isn't.
                 
----
Ye Olde Bailey BBS
Houston,Texas
Node 1: 1 713 520 1569
yob.sccsi.com
Newsgroups: rec.radio.cb
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: RFI Problem
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Distribution: na
Date: Tue, 17 Nov 1992 22:31:33 GMT

maika@bnr.ca (Jan Maika) writes:
: I recently installed a 5/8 ground plane on the side of my house. It
: is and older style with 3 ground radials. It is only about about 13 feet
: from the ground to the bottom of the radials. Last night my neighbour
: came over and complained that I could be heard talking on his telephone lines,
: radio and believe it or not his computer keyboard. I am about 15 feet from his
: phone lines and hydro lines. The ground radials measure about 5-6 feet below 
: these two lines. I am using a mobile set rated at 4 watts out which I have 
: measured. No work has ever been done on the finals so the filters are 
: all intack and unmodified.
:  
: My questions are,
: 
: 1. Will raising the height of my antenna cut down on the RFI etc.?
:    If so how high should I be about the lines?

Possibly. You will be raising the feed point above the neighbor's lines.
You would be better off to move the antenna further away, if possible.

I can understand the signal on the phone line - a bad connection in the
phone wiring causing audio rectification - not too unusual. Also, rf
overload could easily cause the problems on his radio - mainly inthe
FM band. The keyboard has a speaker in it - apparently, the signal is
getting into the computer somewhere.

All the above may be faults of your neighbor's equipment. However, you
should feel duty bound to help eliminate/minimize the problem. Moving
the antenna as far away as possible would be the first step.

: 2. I beleive my signals is clean with no harmonics but will installing
:    a 27MHz bandpass filter help any?

You radio will always transmit harmonics - however, they should be well
down. 

A 27Mhz low-pass filter may help. It will depend on what is causing
the problem. It the problem is harmonics, it will help. If it is due
to rf overload, then it will not do any good. It would probably not
be a bad political move to install one anyway. You could then show
your neighbor that you were doing what you could to eliminate any
such interferance.

: Any help is appreciated as I am off the air until I can resolve this 
: problem.

Good luck. Sometimes, it is impossible to find a solution, unless the
neighbor takes some steps to modify his own equipment. For example,
the ac inputs of the equipment can be bypassed (for rf) to ground.

Sometimes, the equipment can be placed in a shielded enclosure. Or,
better quality antenna lead-in can be used.

Bill
Newsgroups: rec.radio.cb
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: Basic Advice
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Date: Sun, 22 Nov 1992 10:06:30 GMT

myers@hpfcso.FC.HP.COM (Bob Myers) writes:
: > Nope. It may be a half-wave vertical, but it is not a half wave dipole.
: > It is end fed, not fed in the middle. Look at the sensitivity of end
: > fed antennas, you will see that it is high for all lengths.
: 
: It still might be a vertical half-wave dipole - remember the "bazooka"
: design, in which the feed is *through* the end, with the feedline going
: through a cylindrical element to the mid-point, and then the outer conductor
: ties to the "pipe" you just passed through, while the inner conductor ties
: to the upper element.  In this case, no radials would be required or
: desired.  The point is, your blanket statement regarding radials needs
: some disclaimers - there ARE vertical designs which fit the description
: given but which SHOULD NOT be used with radials.  The first place to check
: in this case, given that it's a commerical design, would be in the owner's
: manual, or lacking that, a call to Shakespeare.

You are right - I had forgotten about the bazooka, although it is not
end fed.

I did state that radials were not desired on dipoles.

Bill
From: wells@hpfcso.FC.HP.COM (John Wells)
Date: Tue, 17 Nov 1992 23:03:15 GMT
Subject: Re: RFI Problem
Organization: Zanzor of the CLOUDS
Newsgroups: rec.radio.cb

> My questions are,
> 
> 1. Will raising the height of my antenna cut down on the RFI etc.?
>    If so how high should I be about the lines?

Maybe, but your best bet might be to move the antenna to the other side of 
the house.  Height may make a diff. but usually it is the strong RF feild
associated with the antnenna and it's mast.  If the antenna is old, make sure
that the SWR is very low and that the connections at all the  joints are 
clean and very tight.  Every so often (every 2 to 3 years depending on how the
SWR is doing or if there is any unusal RFI things happening) I will disassemble
my antenna joints and lightly sand the tubing with #600 sandpaper and 
reassemble.  To keep the tubing tight I use automotive hose clamps.

> 2. I beleive my signals is clean with no harmonics but will installing
>    a 27MHz bandpass filter help any?

More than likely not,  your neighbor is picking up the fundimental frequency.
If there was strong interferance on one of the TV channels then it might be
likely a filter would help.  It very well may be that your neighbor needs to 
have a filters installed on the devices that are picking up your signal.
This is more common in cases of RFI than is imagined.  

I believe that the ARRL has a hand book on resolving RFI problems and
that this would shed a bit of light on the whole process.

		Have fun!	John in the Fort
Newsgroups: rec.radio.cb
Subject: Re: central question / FAQ needed
From: jonc@status.gen.nz (Jon Clarke)
Date: Sun, 22 Nov 92 12:53:51 GMT
Organization: The Z*NET Global News Gateway in Parnell New Zealand.

myers@hpfcso.FC.HP.COM (Bob Myers) writes:

> What you're describing sounds like amateur packet radio; you will need
> an amateur radio ("ham") license and equipment.  At least in the U.S.,
> packet transmission is not allowed in the CB band.
 
 Here in New Zealand Packet is allowed on the citizen service. For those
 of you with a good reciever and the help of god (propergation is great
 at the moment) listen on 26.650 USB for the local Auckland Packet BBS
 using the call AK500 .

  
  Jon  Clarke                                        Z*NET Pacific
  ================================================================
  Phone (+649) 358-5589  GEnie   : J.CLARKE6      CI$ : 75300,1642
  Fax   (+649) 302-2672  Hexagon : HSBC NZ EBD    IFNA: 3:772/105
  ----------------------------------------------------------------
  "The problem is between the chair and the Keyboard"  JimT NCR'91
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 20 Nov 1992 19:20:06 GMT
Subject: Re: central question / FAQ needed
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.radio.cb

> Hi,
> 
> I have some central questions about connecting
> two hosts via some protocol, without using
> the telephone-net :
> 
> I want to connect two or more hosts (running
> Unix) with either TCP/IP or ka9q or something
> by transmitting the data 'through the air'!
> 

What you're describing sounds like amateur packet radio; you will need
an amateur radio ("ham") license and equipment.  At least in the U.S.,
packet transmission is not allowed in the CB band.

I would suggest that you contact a local amateur radio club for further
information on both ham radio and licensing in general, and packet in
particular.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: rec.radio.cb
Subject: Re: where to buy swr meter ?
From: jonc@status.gen.nz (Jon Clarke)
Date: Mon, 23 Nov 92 07:22:39 GMT
Organization: The Z*NET Global News Gateway in Parnell New Zealand.

billn@hpcvaac.cv.hp.com (bill nelson) writes:

> 
> Yes, you need a short cable to connect the CB radio to the SWR meter.
> It will have male connectors at both ends. The proper place for the
> SWR meter is right at the feedpoint on the antenna, but that is not
> really practical on your antenna. Don't worry about it, for the short
> length of coax you have, it won't matter.
> 
> Bill

 
 Bill,
 
 While this may be a good idea to attach your swr meter to the feed point
 you then stand to effect the SWR readings it self. Take a quad for 
 example. If you mount the test equipment near the feed point it does 
 indeed effect the feed point.
 
 In my experiece if match and tune your areial with all the feed line
 in place and at an SWR of 1:1 you will have no problem.

  
  Jon  Clarke                                        Z*NET Pacific
  ================================================================
  Phone (+649) 358-5589  GEnie   : J.CLARKE6      CI$ : 75300,1642
  Fax   (+649) 302-2672  Hexagon : HSBC NZ EBD    IFNA: 3:772/105
  ----------------------------------------------------------------
  "The problem is between the chair and the Keyboard"  JimT NCR'91
Newsgroups: rec.radio.cb
From: ad838@yfn.ysu.edu (Michael Rolfes)
Subject: Re: class c
Organization: Youngstown State University/Youngstown Free-Net
Date: Sat, 21 Nov 1992 20:07:33 GMT


Class B is also known as General Mobile Radio Service (GMRS)
462.500 Mhz-462.725 Mhz....

It is no longer open to nbusiness users... Family only!

-- 
***********************
*Michael "Mike" Rolfes*
*usr2879a@tso.uc.edu  *
*Cincinnati, OH  USA  *
Newsgroups: rec.radio.cb
From: barry@geovision.gvc.com (Barry Comer)
Subject: items for sale
Organization: Not officially GeoVision Systems Inc., Ottawa, Ontario, Canada
Distribution: na
Date: Sat, 21 Nov 1992 01:55:53 GMT

Folks:

	I have the following items for sale.  All include orginal packing and
	manuals.  Each item is in prime condition.

	1 - TRC 221 40 channel WT	$100.00 CDN 
		Includes 	- 10 nicads and charger
					- hand held mike
					- adapter for PL-259
					- 12 volt adapter for car

	1 - TRC 465 40 channel mobile sidebander $150.00 CDN
		Includes	- Mag. mount base loaded ant.
					- Trunk mount base load ant.

	Buyer covers shipping.

thanks for your time
Barry Comer
1-(613)-727-1681 home
1-(613)-722-9518 Ext. 226 work

-- 

===========================================================================
	I would write a signiture file but I don't have the time.  Then again
	I guess I just did, go figure.  Funnier things have happened.....
From: pfein@remus.rutgers.edu (Peter Fein)
Newsgroups: rec.radio.cb
Subject: CB FOR SALE
Keywords: FOR SALE
Date: 23 Nov 92 20:58:05 GMT
Organization: Rutgers Univ., New Brunswick, N.J.


For Sale Lafayette SSB-140 base CB radio.
This is a fully loaded unit with: 
Upper and lower side band.
Full meters including SWR, modulation, signal strength, etc.
Full controls including Mike Gain, Noise balnker, and much more.
Can run of 120 volt AC or 12 volt DC.
I have no Mic for it but it takes what appears to be a DIN type plug
It works great and I must sell it soon.
Asking $75 or best offer.
I also have uniden mobile I'll sell for $30.

unit is in North/central New Jersey 

email at pfein@remus.rutgers.edu
	 pfein@romulus.rutgers.edu

or call at (908) 220-1346
Newsgroups: rec.radio.cb
Subject: Re: where to buy swr meter ?
From: jonc@status.gen.nz (Jon Clarke)
Date: Wed, 18 Nov 92 07:31:04 GMT
Organization: The Z*NET Global News Gateway in Parnell New Zealand.

jxs18@po.CWRU.Edu (Jerry Sy) writes:

> 
> what is the price range of swr meters ?
> where can I buy one that will work decently ? is it something one
> can construct from parts from a Radio Shark store ?
> 
> is there a way to fine tune an antenna without using an swr meter ?
> any tricks from cb experts in the net ?
 
 Jerry, yes there are many ways to do it without a SWR meter the most
 common was with a Field Strength Meter which I still use with a SWR.
 
 regards from division 41

  
  Jon  Clarke                                        Z*NET Pacific
  ================================================================
  Phone (+649) 358-5589  GEnie   : J.CLARKE6      CI$ : 75300,1642
  Fax   (+649) 302-2672  Hexagon : HSBC NZ EBD    IFNA: 3:772/105
  ----------------------------------------------------------------
  "The problem is between the chair and the Keyboard"  JimT NCR'91
From: gary@ke4zv.uucp (Gary Coffman)
Newsgroups: rec.radio.cb
Subject: Re: Basic Advice
Date: 22 Nov 92 15:54:46 GMT
Article-I.D.: ke4zv.1992Nov22.155446.5378
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group

In article <1992Nov22.103738.17183@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
>
>Can you even use an end-fed half-wave antenna. I cannot find my old
>Radio Amateur Handbooks - the newer ones have precious little on antenna
>theory, so I have to trust my memory. 

Sure. All the "thru the glass" systems for 2 meter ham use are 1/2 wave
antennas being end fed. Lots of AM broadcast verticals are end fed 1/2
wave antennas (lots more are 5/8 wave, but that's a different can of
worms). The feed point will be very high impedance, but that's just
a matching network design issue.

Gary KE4ZV