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[aprssig] Current path

Rodge Jones g0cjm at live.com
Tue Mar 9 14:08:26 UTC 2010


Current mobile/fixed paths are as follows allowing for excellent Igate and Digi.

Path: APRS,WIDE*,WIDE6-6:  sometimes here i try out CQ,ARISS* but with little success.

Very best wishes/Tres meilleurs sentiments,

Rodge

 

Rodge E. JONES G0CJM G6XCJ [g0cjm at live.com]

07928-252-090 [or] 07805-85-44-26*
*NOT available outside Britain.
Path outside Britain: CQ,ARISS* (Simplex 145.825Mhz)
radio location:    www.aprs.fi/g0cjm-9 (sometimes -12)

Prof. R.E.JONES PJM(1962)HMAF(Vtn) Physics & Solar-flux.
Je parle francais et Chinois de Canton. I am a linguist in SIX languages. these include Cantonese and Malay.
Due to war firefight both legs are amputated and hearing lost (Borneo 1962).
Life-Member:RMPA. Member:CTS.,RGJRA.,G-QRP.,OCA43rd & 52nd.,BRARS.

Private & Confidential to addressee. DPA 1998 HRA 1998

R S V P !! 




> From: aprssig-request at tapr.org
> Subject: aprssig Digest, Vol 69, Issue 9
> To: aprssig at tapr.org
> Date: Tue, 9 Mar 2010 12:00:02 +0000
> 
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> 
> Today's Topics:
> 
>    1. Re: Color Display (Shawn Stoddard)
>    2. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
>       Antenna Now Up (Stephen H. Smith)
>    3. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
>       Antenna Now Up (Lynn W. Deffenbaugh (Mr))
>    4. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
>       Antenna Now Up (Stephen H. Smith)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 8 Mar 2010 08:28:57 -0500
> From: Shawn Stoddard <stoddard at pobox.com>
> Subject: Re: [aprssig] Color Display
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <20100308132907.894EB94955 at b-sasl-quonix.pobox.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> This is research for a new piece of software. I recall having seen something on aprs.org regarding how tro display the icon for station to show more than location. I'll keep digging.
> 
> 
> -----Original Message-----
> From: Curt, WE7U <curt.we7u at gmail.com>
> Sent: Sunday, March 07, 2010 11:04 PM
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Subject: Re: [aprssig] Color Display
> 
> On Sun, 7 Mar 2010, Lynn W. Deffenbaugh (Mr) wrote:
> 
> > Shawn Stoddard wrote:
> >> I recall seeing something about the color of a station indicating how 
> >> recently it has been heard from. Anybody know where I might have seen this?
> >
> > It would help to know what APRS software you are referring to with this 
> > question.  The display of a station, particularly its color, is up to the 
> > software and not part of the APRS protocol spec itself, although Bob 
> > Bruninga's APRSdos had some color coding that it did, but I don't believe it 
> > was based on age, but on capabilities.
> 
> Xastir has a mode: "Display last report age", which displays minutes
> since the station was last heard.  That text starts out green,
> changes to yellow after some number, then red some minutes after
> that.  The intent was to help check up on SAR personnel more often
> via voice-checks if they weren't being heard from on APRS.  If the
> age goes yellow, call then on voice.  If it goes red, perhaps have
> another team check on them.
> 
> -- 
> Curt, WE7U.                         <http://www.eskimo.com/~archer>
>     APRS:  Where it's at!                    <http://www.xastir.org>
>    Lotto:  A tax on people who are bad at math. - unknown
> Windows:  Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me:  I picked the coordinate system!"
> 
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Mon, 08 Mar 2010 14:41:51 -0800
> From: "Stephen H. Smith" <wa8lmf2 at aol.com>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> 	Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B957D2F.3060106 at aol.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> [ 14:30 Pacific Time (02:27 UTC)  Monday 8 Mar]  
> 
> I have successfully built, tuned and erected a homebrew magnetic loop 
> antenna this afternoon.    I now have this antenna connected to the 
> TS-50 that is monitoring 10.149 APRS (Both AX.25 FSK and PSK63).     
> This replaces the homebrew vertical dipole made from two 30M mobile 
> HamSticks that I have been using up til now.    The HF all-us map 
> display on my web server at:
> 
>     <http://wa8lmf.dyndns.org:14439>  
> 
> is now using the new loop antenna.  
> 
> The first thing I noticed is that the natural background hiss and "band 
> noise" heard with the new antenna dropped about 1 S-unit compared to the 
> dipole.    However, the TV sync hash from a leaking cable TV trunk, and 
> AC hum and buzz that I was hearing on the dipole has completely 
> disappeared.   I appear to have a far higher signal-to-noise ratio than 
> before.    
> 
> I expect that the small (1 meter diameter) resonant loop will have far 
> better high-angle reception than the vertical dipole.  I should be able 
> to hear stations up and down the west coast (i.e. a relatively short 
> haul of 400-1000 miles) much better.   
> 
> Eagerly awaiting the stations from the midwest and east coast that 
> normally start showing up about 16:00 local time.  
> 
> Details on this dirt-cheap easy-to-build compact antenna  for 30 meters 
> (that could be stealthed in an attic) will follow in a week or so.
> 
> ------------------------------------------------------------------------
> 
> --
> 
> Stephen H. Smith    wa8lmf (at) aol.com
> EchoLink Node:      WA8LMF  or 14400    [Think bottom of the 2M band]
> Skype:        WA8LMF
> Home Page:          http://wa8lmf.net
> 
> NEW!    Universal HF/VHF/UHF Antenna Mounting System
>   http://wa8lmf.net/mobile/UniversalAntMountSystem.htm
> 
> "APRS 101"  Explanation of APRS Path Selection & Digipeating
>   http://wa8lmf.net/DigiPaths
> 
> Updated "Rev H" APRS            http://wa8lmf.net/aprs
> Symbols Set for UI-View,
> UIpoint and APRSplus:
> 
> 
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Mon, 08 Mar 2010 17:53:27 -0500
> From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> 	Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B957FE7.2020003 at homeside.to>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Stephen H. Smith wrote:
> > Eagerly awaiting the stations from the midwest and east coast that 
> > normally start showing up about 16:00 local time. 
> > Details on this dirt-cheap easy-to-build compact antenna  for 30 
> > meters (that could be stealthed in an attic) will follow in a week or so.
> 
> And I'm eagerly awaiting the antenna details!  I just posted a request 
> for 30m antenna suggestions to another group and received some 
> suggestions, but I'm looking to go cheap, dirt-cheap is even better!  
> Any early hints or links so I can start to get a handle on what to 
> expect?  Even if it's a reference to a page number or article title at 
> arrl.net or the 2010 Handbook, I'm all eyes!
> 
> Lynn (D) - KJ4ERJ-1 - IGating 10.147.600 both AX.25 and PSK-63 from Palm 
> Bay, FL  USA (EL97qx)
> 
> PS. See http://tinyurl.com/IGATE-KJ4ERJ-1 for recently heard stations
> 
> 
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Mon, 08 Mar 2010 16:01:10 -0800
> From: "Stephen H. Smith" <wa8lmf2 at aol.com>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> 	Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B958FC6.3080506 at aol.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Lynn W. Deffenbaugh (Mr) wrote:
> > Stephen H. Smith wrote:
> >> Eagerly awaiting the stations from the midwest and east coast that 
> >> normally start showing up about 16:00 local time. Details on this 
> >> dirt-cheap easy-to-build compact antenna  for 30 meters (that could 
> >> be stealthed in an attic) will follow in a week or so.
> >
> > And I'm eagerly awaiting the antenna details!  I just posted a request 
> > for 30m antenna suggestions to another group and received some 
> > suggestions, but I'm looking to go cheap, dirt-cheap is even better!  
> > Any early hints or links so I can start to get a handle on what to 
> > expect?  Even if it's a reference to a page number or article title at 
> > arrl.net or the 2010 Handbook, I'm all eyes!
> >
> > Lynn (D) - KJ4ERJ-1 - IGating 10.147.600 both AX.25 and PSK-63 from 
> > Palm Bay, FL  USA (EL97qx)
> >
> > PS. See http://tinyurl.com/IGATE-KJ4ERJ-1 for recently heard stations
> >
> >
> >
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> I'd do a web page on it now, but I'm getting ready for the IWCE 
> (International Wireless Communications Expo) in Las Vegas this week.   
> 
> 
> Basically, a "magnetic loop" antenna is a very small (relative to 
> wavelength) single-turn loop tuned to resonance with a series 
> capacitor.   A second, much smaller loop connected directly to a coax 
> feed line is placed inside the larger loop, nearly tangent to the first 
> loop at the side opposite the capacitor.   This small loop forms the 
> primary winding of an air-core RF transformer with the larger loop 
> forming the secondary winding
> 
> 
> Such a device can be nearly as efficient on transmit as a full-sized 
> dipole -IF- the loop and capacitor are very efficient and low loss.   
> The MFJ "Super-HI-Q Loop" antenna and the old AEA "IsoLoop" are 
> commercial versions of such an antenna that are tunable between 10 to 30 
> MHz.   With a 100 watt transmitter, HUNDREDS of RF amps circulate in the 
> loop and 4,000-to-10,000 volts can appear across the capacitor. 
> 
> 
> My loop is constructed of 3/8" soft copper "refrigeration tubing" from 
> Home Depot.   Ten feet of this are bent into a circular loop about 1 
> yard in diameter.    The support is a vertical mast  made from a piece 
> of 1" Sched 40 PVC water pipe. with two 3/8" holes drilled through it's 
> diameter about 37" apart.   
> 
> 
> The trick was the capacitor.  Normally, mag loop ants use motorized 
> high-voltage butterfly, split-stator variable caps or variable vacuum 
> caps to tune the loop to resonance while withstanding very high RF 
> voltages.  (I.e. the kind of variable caps you see in high power antenna 
> tuners.)  Since I didn't need the antenna to be tunable (it's going to 
> set to a single spot frequency (10.149 MHz) permanently, I calculated 
> the required capacitance and set out to create a cheap fixed-value cap 
> with 4-5 KV breakdown.
>  
> 
> The inside diameter of the 3/8" tubing is an EXACT fit for the center 
> conductor and dielectric of RG-8 or RG-213 coax.   I stripped the outer 
> jacket and braid off 37" of RG-213 cable and then stripped the 
> dielectric off half an inch of the remaining insulated center 
> conductor.   I soldered the exposed half-inch of the cable to the INSIDE 
> of one end of the  loop tubing.   (You'll need a old-fashioned  150 
> soldering iron  or a Berz-O-Matic torch to heat up the copper tubing 
> (not a wimpy electronics pencil or temp-controlled soldering station) 
> since the copper is such a good conductor of heat!    I then jammed the 
> remaining 36 1/2" of dielectric-covered center conductor into the open 
> other end of the copper tubing.  Push it in until the loop is nearly 
> closed with only a 1/4" so so gap between the two ends.
>      
> 
> This construction creates a coaxial capacitor with the coax cable center 
> conductor being one plate and the INSIDE of the copper tubing being the 
> other plate.  The 36" or so of cable inside the tubing creates a 
> capacitance of about 75pF required to resonate the loop.  Normal 50-ohm 
> coax has a capacitance of about 30-33 pF/foot.   The snug fit between 
> the center conductor/dielectric, and the inside diameter of the tubing, 
> very closely duplicates the geometry, and thus capacitance of the 
> original coax .   (You could literally make your own copper hardline 
> from this tubing by pushing yards and yards of center 
> conductor/dielectric from RG/8, RG/213 or RG/214 into it.) 
> 
> 
> You tune the loop to exact resonance by pulling the loop apart, or 
> pushing the loop together exposing more or less of the coax cable.  
> (Only the portion of the coax opposite the tubing's inside diameter 
> contributes to the capacitor value.)  In my model, I had to expose about 
> 3/8" of the dielectric to get to 10.149 MHz.  The tuning is VERY sharp 
> (indicating hi Q and high efficiency).  A change of 1/8th inch moves the 
> resonance about 100Kz.  The bandwidth for 2:1 SWR is only about 12 
> KHz.    This is actually an advantage for single frequency operation - 
> the antenna is so selective that transmitting on other HF bands 
> simultaneously won't desensitize the 30M receiver at all. 
> 
> 
> Finally, create the coupling loop. I cut 22" of normal  #14 THHN copper 
> house wire, formed it into a loop approximately 7-1/2" diameter and 
> soldered the ends to the center conductor and braid of any convenient 
> length of 50-ohm coax to reach to the radio.   This loop is then placed 
> so that it is about 1/4" away from the inside circumference of the large 
> loop on the side opposite the open-ends/capacitor.  I drilled a couple 
> of additional holes in the PVC pipe to support the small loop in the 
> proper orientation. By bending (distorting this circle) so that more or 
> less of it is closely parallel to the big loop, you fine-tune the SWR at 
> resonance.  Mine  has an SWR of under 1.5:1 at resonance.  
> 
> ------------------------------------------------------------------------
> 
> 
> 
> 
> ------------------------------
> 
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> 
> End of aprssig Digest, Vol 69, Issue 9
> **************************************
 		 	   		  
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