[HCARC] HCARC Digest, Vol 21, Issue 1
Michael R Perez
mikerey.perez at me.com
Sun Jan 6 01:57:02 EST 2013
Gary:
As to your questions on the two types of batteries, I got these 2 paragraphs that were written in a paper.
Link is http://www.unitedstatesaction.com/batteries_for_emergency_communication.htm
Thought it might help explain this a bit better.
I'm learning some if this stuff as well and thoroughly enjoy your probing questions.
Kerrville has a very knowledgeable ham radio group.
Title and credit below:
Batteries for Emergency Communications
by
Brett Hammond - KB3HGP
Talbot County RACES Officer
for
The Easton Amateur Radio Society (EARS)
on
January 21, 2003
http://www.k3emd.com/Technical%20References.htm
****************
"Nickel-metal Hydride (NiMH) rechargeable batteries are generally thought to not suffer from the "memory-effect" of NiCad batteries and can be recharged after very little discharge without affecting the performance of the battery (although one source claims these batteries do suffer from a "memory effect"). They can be recharged 500 to 1000 times and are lighter and smaller than NiCads. They may not function in sub zero temperatures and do not provide as much current as NiCad batteries. If a high current load is applied it may provide less than half the rated AH, and may reduce the lifetime of the battery by 65% or more. These batteries are better than NiCads for low current draw over long periods of time.
Lithium-ion (Li-ion) rechargeable batteries last longer, are smaller and lighter than both NiCad and NiMH batteries, but are more expensive. These batteries have a very good power to weight ratio and are frequently used in laptop computers and cell phones. They do not provide as much current as NiCad batteries and if a high current load is applied they can die within seconds. A big plus to the environmentally conscience is that there is nothing poisonous inside a Li-ion battery (note that some other Lithium batteries besides Li-ion are toxic). They can be disposed of by throwing them in the trash."
Sent from my iPod
On Jan 3, 2013, at 11:00 AM, hcarc-request at mailman.qth.net wrote:
> Send HCARC mailing list submissions to
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>
> Today's Topics:
>
> 1. Best Battery Type?? (Gary and Arlene Johnson)
> 2. Tower Available (Bill Tynan)
> 3. CENTEX RED CROSS RADIO ROUNDUP (Alan Cone)
> 4. Prepper Meeting on Emergency Communications
> (galeheise at windstream.net)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 2 Jan 2013 12:36:11 -0600
> From: "Gary and Arlene Johnson" <qltfnish at omniglobal.net>
> To: <hcarc at mailman.qth.net>
> Subject: [HCARC] Best Battery Type??
> Message-ID: <293A54D7BA754DB2B485DA838963946F at Minnie>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Which of these would be the better battery to add to a Handy Talky?? Which one is most likely to have the max number of recharges and which won't have "memory problems".
>
> Li-ion Battery Pack 7.4V 1600 mAH or Ni-MH Battery Pack 7.2V 2000 mAH
>
> ------------------------------
>
> Message: 2
> Date: Wed, 2 Jan 2013 12:36:31 -0600
> From: "Bill Tynan" <billandmattie at windstream.net>
> To: "HCARC Reflector" <HCARC at mailman.qth.net>, "RMG Reflector"
> <rmg at k5rmg.com>
> Cc: Louis McFadin <w5did at amsat.org>
> Subject: [HCARC] Tower Available
> Message-ID: <58F7E62CD0F84DE297EACE82AEE328BD at MAIN>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
> This from today's 205 Morning Report.
>
> AB-105 is very good tower. It's what most of the PVRC guys use. My only problem with it is that there is no horizontal surface on which to step. All of the cross members are at an angle. I climbed W3TMZ's once and it was very uncomfortable.
>
> FOR SALE 180 feet of Military tower AB-105 $50.00 per 10 foot section, 3 Bases available $50.00 each, Misc lengths of guy
>
> wire and some insulators. No bent sections. Will deliver 150 miles of Seminole, FL (zip 33772) for 20 cents
>
> per mile. $1000 will take it all. MUST SELL, OFFERS CONSIDERED. Can bring it to Orlando Ham Fest if not sold by then.
>
> AB-105C Specs
>
> Max. Height with no additional loads 280 feet
>
> Max allowable bending moment at tower top 20,000 ft-lbs
>
> Max verticle guy span under max loading conditions 35 feet
>
> width of tower face between CG of legs 22.58 inches
>
> projected area of one face per lineal foot
>
> of tower 0.5513 sq. ft.
>
> wind pressure per lineal foot of tower 27.99 lbs (RS-222A no ice)
>
> radius of gyration (least) of tower 9.04 inchs
>
> cross sectional area of one leg 0.603 sq. inches
>
> moment of inertia (least) of tower 14.76
>
> distance from center of tower to CG leg 13.04 inches
>
> section modulus (least) of tower 11.33"
>
> section modulus of one leg 0.171" (least)
>
> radius of gyration of one leg 0.560" (least)
>
> flyin' Bryan
>
> K3AAF
>
> 727-235-0115 land line
>
> eat more moose. 10,000 wolves can't be
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 2 Jan 2013 14:46:19 -0600
> From: "Alan Cone" <alan at primecone.com>
> To: <hcarc at mailman.qth.net>
> Subject: [HCARC] CENTEX RED CROSS RADIO ROUNDUP
> Message-ID: <0DDCCF6B9D23471E90FEB4FC5810148A at AlanLaptop>
> Content-Type: text/plain; charset="us-ascii"
>
> Help is needed, because of my inexperience with such things, and we need
> more participation for the HCARC.
> Three events: ECHOLINK/IRLP NET
> HF NET
> DIGITAL NET - WINLINK
>
> All help will be gratefully received. Please see me at the meeting tomorrow
> (Thursday) night.
>
> ALAN CONE K5AFC
> 830 890-5815
> 214 244-7382 Celllular
> 830 890-5817 Fax
> -----Original Message-----
> From: hcarc-bounces at mailman.qth.net [mailto:hcarc-bounces at mailman.qth.net]
> On Behalf Of hcarc-request at mailman.qth.net
> Sent: Sunday, December 30, 2012 11:00 AM
> To: hcarc at mailman.qth.net
> Subject: HCARC Digest, Vol 20, Issue 21
>
> Send HCARC mailing list submissions to
> hcarc at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/hcarc
> or, via email, send a message with subject or body 'help' to
> hcarc-request at mailman.qth.net
>
> You can reach the person managing the list at
> hcarc-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of HCARC digest..."
>
>
> Today's Topics:
>
> 1. Re: Antenna (Kerry Sandstrom)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 29 Dec 2012 19:52:33 -0600
> From: "Kerry Sandstrom" <kerryk5ks at hughes.net>
> To: "H. Vordenbaum" <tower2 at stx.rr.com>, <HCARC at mailman.qth.net>
> Subject: Re: [HCARC] Antenna
> Message-ID: <17970138A6044D6D8FAFA24A30BFAEEC at NumberCruncher>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Hi Harvey,
>
> Do you have a few details on the particular G5RV antenna you're thinking
> about. There seem to be more than a few versions. Also any info on the
> feedline/matching sections used.
>
> I have a MiniNEC G5RV model that runs on NEC2 with no problems. It is one
> someone else created and published. It is a center fed 102' long and 50'
> off the ground. Unfortunately, the SWR plot showed over 10:1 across the
> whole band on 80 meters.. By the digital portion of the band I assume you
> mean 3580 kHz and by the upper SSB band I assume you mean 3900 kHz and up.
>
> 3580 - 3900 kHz is an awful lot to expect. My vertical which is about half
> size for 80 meters and is fairly simple design (HF2-V) does a good job from
> 3500 - 3530 kHz. If I feeling lucky I can sometimes get up to 3540 or so.
> Thats with a 2:1 SWR. I think the best you could ever expect is about 100
> kHz bandwidth with a full size dipole on 80 m. For a G5RV with its sub-size
>
> and crazy feed scheme, I believe you would be lucky to get 50 kHz for a 2:1
> SWR.
>
> The broadband dipoles such as thye B&W broadband dipole is notoriously
> lossy, like -6dB and is fullsize on 80 m. Loss appears to be from the
> "matching circuit" at the feedpoint.
>
> If I was in your situation, I would have a two parallel dipoles connected at
>
> the center. One would be cut for 3580 and the other for 3950. Yoiu could
> probably cover 50 kHz or so around both those frequencies with a 2:1 SWR.
>
> Have fun,
>
> Kerry
>
>
>
>
>
> ------------------------------
>
> _______________________________________________
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>
> End of HCARC Digest, Vol 20, Issue 21
> *************************************
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 3 Jan 2013 07:04:31 -0600
> From: <galeheise at windstream.net>
> To: "HCARC Reflector" <HCARC at mailman.qth.net>
> Subject: [HCARC] Prepper Meeting on Emergency Communications
> Message-ID: <18A9EEF63F244CD09FD4C6A54F866094 at GalePC>
> Content-Type: text/plain; charset="UTF-8"
>
> To All:
>
> For those who may be interested, I?m passing along this notice:
>
>
>
> Happy New Year!
>
> The next Hill Country Prepper Meeting is January 10 at Buzzie?s BBQ in Kerrville. 6:30 p.m.
>
> We will be discussing Communications in Emergency Situations. Bring a friend or neighbor. Or a friend and a neighbor.
>
> Come early for some great BBQ before the meeting! Congratulations to Buzzie for winning "Pitmaster". Take note of the banner hanging in the main dinning room.
>
>
>
> ------------------------------
>
> _______________________________________________
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> HCARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/hcarc
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>
> End of HCARC Digest, Vol 21, Issue 1
> ************************************
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