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Ideal Voltage & Current for K2
Darryl J Kelly
I am feeding my K2 with a Samlex 1223 PS with variable voltage currently set at 15.0 volts, display shows 14.4 and 0.30 on receive and 14.1 and 1.80 running 5 watts into 50 ohm dummy load. I intend to run mostly 5 watts or less, with an occasional 10 watt max. What would be considered an ideal voltage setting, higher voltage that I have now ( max 15.0) with less current, or lower voltage and more current, or does it matter? Thanks.
Darryl, KK5IB
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Re: Handy vise - good buy
Thanks Ray
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72 Johnny AC0BQ
On Sunday, June 8, 2014, rcadmus@... [4sqrp] <4sqrp@...> wrote:
-- QRP....."more smiles per watt" JOHNNY AC0BQ ..72
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Re: Field Day Questions
Rick Bennett
When I was researching batteries for solar power some number of years ago, I learned a lot about lead acid batteries. The important thing is to understand that the deeper you discharge a lead acid battery, the fewer discharge-charge cycles you will get out of them. Here is a good technical sheet on Power-Sonic batteries. On page 10 is a graph that shows this relationship. http://www.power-sonic.com/images/powersonic/technical/1277751263_20100627-TechManual-Lo.pdf If you do not plan to cycle the batteries that often, deep discharges are not that big a deal. On the other end of the spectrum the batteries I had for my solar power system lasted probably well over 2000 cycles by keeping the discharge depth in the 15% to 20% range. From personal experience, though I would avoid discharging them 100%, I have had some otherwise good batteries not survive that. NiCad and NiMH on the other hand can be generally be almost fully discharged over and over without affecting the life. I have seen the polarity reversal thing happen on a few, but I believe this is a pretty small percentage. de KC0PET, Rick
From: "dave ho13dave@... [4sqrp]" <4sqrp@...>
To: 4sqrp@... Sent: Sunday, June 8, 2014 10:06:27 AM Subject: Re: [4sqrp] Re: Field Day Questions
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OT: Scratchy Dot reducer for Bug type keys, Update#2
For those operators who use bugs and were interested in the mechanical dot stabilizer I make but were told they weren't available for the models with the flat pendulum such as the Vibroplex Champion, Lightning Bug and the various models of Signal Corps J-36 made by both Vibroplex and Lionel, They are now available.
I was able to borrow both a Vibroplex Champion and a Lionel J-36 from a friend's collection to proof the design which is just slightly different from the round pendulum models due to the difference in the geometry of the U shaped movable dot contact.
Same price as the ones for the round pendulum models, $20 post paid domestic and $20 plus necessary postage to international destinations. Theory of operation and some pictures may be seen at http://artifaxbooks.com/dotstabilizer.htm
Models for which the Mechanical Dot Stabilizer is available:
All Vibroplex models with the Round Pendulum (Original, Blue Racer, etc.)
All Vibroplex models with the Flat Pendulum (Champion, Lightning Bug)
Vibroplex WW2 Signal Corps J-36
Lionel WW2 Signal Corps J-36
All McElroy models with the 3/16" Round Pendulum
TAC models (made in collaboration with McElroy) with the 3/16" Round Pendulum
All Les Logan and E.F. Johnson Speed-X models (Same diameter Round Pendulum as Vibroplex)
Some others such as the Alberto Frattini models with the Flat Pendulum may be able to be
fabricated on a one by one custom basis.
I'll be on vacation from Thursday, June 12 through Sunday, June 22 so any orders during that time will have to wait until I get back.
Again, I'll take orders up until this coming Tuesday and resume taking orders after returning from vacation. Order cutoff is Tuesday, June 10th to
allow time to fabricate and ship any orders received by that time. Any orders arriving after the 10th of June will be in the queue and will ship as
quickly as possible after my return.
If ordering, payment may be made by PayPal or USPS Money Order.
BE SURE TO INCLUDE THE MAKE AND MODEL OF YOUR BUG and whether it's for a Flat or Round pendulum. PayPal address is: Aubrey Sheldon w0eb@...
Money Orders should be made out to Aubrey J. Sheldon
and sent to:
Jim Sheldon - W0EB
2029 East Evanston Dr.
Park City, KS 67219-1618
Thank you for your consideration,
Jim Sheldon - W0EB
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Re: Field Day Questions
John Lonigro
People sometimes forget how the A. H. rating is determined. It is based on a 20 hour constant discharge. As an example, I'm looking at a PowerSonic spec sheet for a 5.0 A.H. SLA. It gives the A.H. rating based on 20, 10, 5, and 1 hour discharge rates. At 20 hours, it is rated at 5.0 A.H. At 1 hour, it is rated at 3.2 A.H. (almost 40% less). The battery gurus have determined many years ago to use a 20 hour discharge rate. If all batteries use the same standard, you can fairly compare various capacities when determining what size you need.
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Who knows how long a battery will last when your receiver draws around 350 ma, your transmitter draws around 2 Amps, and your transmit duty cycle is 20-40%? So, as indicated by the battery calculator referred to earlier, you divide by two to get an approximation and to add a margin of safety. It's a rule of thumb, nothing more. You probably won't damage the battery if you abide by what it says. 72, John AA0VE P.S. Don't forget the SSS later tonight!
On 06/08/2014 11:07 AM, dave ho13dave@gmail.com [4sqrp] wrote:
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Updated Banner
OK.....now the Date header is changed, June vs May ! Thanks guys that had my back so the change could be made. If you forward the Banner or keep copies, then you may want
to download the corrected copy. Going back to bed cuz these pneumonia meds are making me a little weird......72...WAlter - K5EST
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Re: Field Day Questions
dave <ho13dave@...>
I certainly would not consider it dishonest to rate a battery at its maximum available power. The capacity is there should the user choose to use it. It may not be the smartest thing to do, but the capacity is there and available. Nothing in the world wrong with that.
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And in the great majority of cases a fully discharged lead acid battery will recharge fine. One local ham thought it nuts not to use full capacity. AFAIK he never lost one, although I did. As for other chemistries having the same characteristic, I am not aware of that. Ni-Cad's were famous for occasionally requiring full discharge to reduce or eliminate the memory effect. And, yes, the possibility of cell reversal does affect all chemistries as they approach full discharge. At 50% discharge there is essentially no possibility of cell reversal. The 50% discharge recommendation has more to do with insuring a long life. You are free to take a small gamble and fully discharge a lead acid. A lot of guys do. Only rarely do they lose that bet. 73 de dave ab9ca/4
On 6/8/14 10:13 AM, Bill Cromwell wrcromwell@gmail.com [4sqrp] wrote:
Hi Dave,
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Re: QRP Banner is online
AG1P Ron
You did good, Walter!! Another great edition. Thanks for all you do for 4SQRP Ron – AG1P
From: 4sqrp@... [mailto:4sqrp@...]
Sent: Saturday, June 07, 2014 9:01 PM To: 4sqrp@... Subject: [4sqrp] QRP Banner is online
GE 4SQRP'ers, the June 2014 edition of the "Ozark QRP Banner" is now online.
Sorry to be a little late, but unavoidable.
Please don't forget that the 2nd Sunday Sprint, SSS, Is Sunday Night. If you can support the Sprint maybe your signal would be the one that opens up propagation!!!!!
Till next time.....72....Walter - K5EST
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Handy vise - good buy
Ray Cadmus
Some time back the builders among us were excited about the closeout Panavise at RS. Not quite the same but Lowes is closing out Bessey clamps and I saw their vacuum base swivel vise (like Panavise) for $6.95 if I recall correctly. Since I already have a Panavise Ididn't need one - however, I did scoop up a bunch of the small clamps for my woodworking. Regards, ray W0PFO
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Re: QRP Banner is online
On 6/8/2014 12:00 AM, Walter - K5EST walter.k5est@gmail.com [4sqrp] wrote:
Another teriffic Banner Walter. Thanks so much! 72, Jim, K8IQY
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Re: QRP Banner is online
Another FB Banner, Walter.
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The Mag Loop from John was very intresting! 72 Johnny AC0BQ
On Saturday, June 7, 2014, Walter - K5EST walter.k5est@... [4sqrp] <4sqrp@...> wrote:
-- QRP....."more smiles per watt" JOHNNY AC0BQ ..72
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Re: Field Day Questions
Bill Cromwell
Hi Dave,
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The same thing is true of the Lithium batteries according to the manufacturers. That's where there is an internal controller to prevent it from happening in their batteries. It is possible for one of the cells to run down before the others and then it will be reverse charged by the remaining cells. That is destructive. It can happen to any battery technology. It is dishonest for the lead-acid manufacturers to rate batteries beyond that useful discharge point. Maybe some of them do that. 73, Bill KU8H
On 06/08/2014 11:06 AM, dave ho13dave@gmail.com [4sqrp] wrote:
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Re: Field Day Questions
dave <ho13dave@...>
I suspect he was referring to fact that most manufacturers of lead acid batteries recommend that the batteries not be discharged beyond about 50% of stated capacity.
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According to the manufacturers, fully discharging a lead acid battery is not a good idea. Occasionally it will completely kill a battery that ought to survive the discharge. I have had this happen one time. Dunno why. Most all the time they recharge OK, but occasionally one will die. 73 de dave ab9ca/4
On 6/8/14 9:55 AM, Bill Cromwell wrcromwell@gmail.com [4sqrp] wrote:
Hi AJ,
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Re: Field Day Questions
Bill Cromwell
Hi AJ,
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Ampere-hours is Ampere-hours regardless of the source. Just as a ton of feathers weighs the same as a ton of lead. If the lead-acid battery in your example has half the capacity of the Lithium battery it will be rated as such. There are some differences in the discharge voltage curves inre the slope of such but that doesn't change the math. An Ampere- hour is still an Ampere-hour. 73, Bill KU8H
On 06/08/2014 06:40 AM, email4utoo@yahoo.com [4sqrp] wrote:
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Final reminder for SSS this evening!
John Lonigro
This is your final reminder that the SSS is tonight (SUNDAY), from 7:00 - 9:00 pm CDT.
Send your results to secondsundaysprint@4sqrp.com and put "Sprint" in the subject line. Good luck in the contest and 72, John AA0VE SSS Coordinator
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Re: QRP Banner is online
ohhh Dale....ya can't be riding a bicycle in the snow.......or a buffalo herd.....it was once said.. :-) Say, is it ok to publish your CW nets in the QRP Banner. I really feel bad for not asking you a long time ago. Besides you always support the 4State Group. .........Walter . K5EST.........
On Jun 8, 2014 7:15 AM, "Dale Putnam daleputnam@... [4sqrp]" <4sqrp@...> wrote:
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Re: QRP Banner is online
Dale Putnam
Another Super edition, thank you Walter, very nice read!! Now.. where'd that bicycle go? Have a great day, --... ...-- Dale - WC7S in Wy To: 4sqrp@... From: 4sqrp@... Date: Sat, 7 Jun 2014 23:00:41 -0500 Subject: [4sqrp] QRP Banner is online GE 4SQRP'ers, the June 2014 edition of the "Ozark QRP Banner"
is now online. Sorry to be a little late, but unavoidable. Please don't forget that the 2nd Sunday Sprint, SSS, Is Sunday Night. If you can support the Sprint maybe your
signal would be the one that opens up propagation!!!!! Till next time.....72....Walter - K5EST
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Re: Field Day Questions
email4utoo@...
Terry, or whomever wants to chime in on this - Does this Battery Life Estimator take in to consideration different types of Batteries in Example of SLA verses LiFePO4 s ? Ah- amp hours of lead acid actual duration is 50% compared to LiFePO4 s , from what i have read so far , is this correct ?
Thanks, AJ W5heh
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Re: Field Day Questions
email4utoo@...
Jim, thanks for asking about Battery capacity , i did not know about that handy resource page either , that will help . Also consider coming to Field Day this way , better than the big city , hihi. Enjoy all, 73s , AJ W5heh
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QRP Banner is online
GE 4SQRP'ers, the June 2014 edition of the "Ozark QRP Banner" is now online. Sorry to be a little late, but unavoidable. Please don't forget that the 2nd Sunday Sprint, SSS, Is Sunday Night. If you can support the Sprint maybe your
signal would be the one that opens up propagation!!!!! Till next time.....72....Walter - K5EST
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