Date   

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



Re: Handy vise - good buy

Johnny AC0BQ
 

Thanks Ray
72
Johnny AC0BQ


On Sunday, June 8, 2014, rcadmus@... [4sqrp] <4sqrp@...> wrote:
 

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




--
QRP....."more smiles per watt"
72
JOHNNY AC0BQ  ..


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

 


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.

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@... [4sqrp] wrote:
> Hi AJ,
>
> 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@... [4sqrp] wrote:
>>
>> 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
>>
>>
>>
>
>
>
> ------------------------------------
> Posted by: Bill Cromwell > ------------------------------------
>
> 4SQRP Website: http://4sqrp.com
> OzarkCon is coming April 4-5, 2014 in Branson, MO
> View Details at http://www.ozarkcon.com/index.phpYahoo Groups Links
>
>
>
>



OT: Scratchy Dot reducer for Bug type keys, Update#2

Jim Sheldon
 

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


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.

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:


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.

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,

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:


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.

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


------------------------------------
Posted by: Bill Cromwell <wrcromwell@gmail.com>
------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 4-5, 2014 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo Groups Links




Updated Banner

Walter - K5EST
 

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


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.

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,

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:


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.

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


------------------------------------
Posted by: Bill Cromwell <wrcromwell@gmail.com>
------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 4-5, 2014 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo Groups Links




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

 

 


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



Re: QRP Banner is online

Jim Kortge
 

On 6/8/2014 12:00 AM, Walter - K5EST walter.k5est@gmail.com [4sqrp] wrote:


GE 4SQRP'ers, the June 2014 edition of the "Ozark QRP Banner"
is now online.

http://www.4sqrp.com/TheBanner.php

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
Another teriffic Banner Walter. Thanks so much!

72,

Jim, K8IQY


Re: QRP Banner is online

Johnny AC0BQ
 

Another FB Banner, Walter.
The Mag Loop from John was very intresting!
72
Johnny AC0BQ 


On Saturday, June 7, 2014, Walter - K5EST walter.k5est@... [4sqrp] <4sqrp@...> wrote:
 

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




--
QRP....."more smiles per watt"
72
JOHNNY AC0BQ  ..


Re: Field Day Questions

Bill Cromwell
 

Hi Dave,

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:


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.

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


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.

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,

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:

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




------------------------------------
Posted by: Bill Cromwell <wrcromwell@gmail.com>
------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 4-5, 2014 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo Groups Links




Re: Field Day Questions

Bill Cromwell
 

Hi AJ,

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:

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


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


Re: QRP Banner is online

Walter - K5EST
 

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.........
Editor - Ozark QRP Banner
.............4sqrp.com............

On Jun 8, 2014 7:15 AM, "Dale Putnam daleputnam@... [4sqrp]" <4sqrp@...> wrote:
 

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




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




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


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


QRP Banner is online

Walter - K5EST
 

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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