Date   

Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 02/05/2020 8:00pm-9:00pm #cal-reminder

main@4SQRP.groups.io Calendar <main@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When: Wednesday, 5 February 2020, 8:00pm to 9:00pm, (GMT-06:00) America/Chicago

Where:40 and 80 Meters

View Event

Organizer: jomatlock@...

Description: The 40 Meter Net will be at 8:00 pm central time  on 7.122 +-. QRM
NCS is WQ5RP Operator to be determined.

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday). 
The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operators are Johnny AC0BQ or Paul N0NBD.

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 0300 UTC (9:00PM Central Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: W0RW @ Ice Station Zebra, 25 Jan. 20, 1800z

w0rw
 

After the Winter FD Ops at Ice Station Zebra,
Don, AA6GA, told me that i was not responding to some calls on 7032 kHz.
i checked my BC-221 and found that my transmit frequency was 400Hz lower than my receive frequency. So the only guys i worked were those who didn't zero beat me.
i was not 'transceiving', i was working 'split'.
The base transceiver i am using in my Re-Purposed BC-221 is the '1 Watter'.

i checked out the 1 Watter and found that the 10V regulator (U1, 78L10) on the VXO was not regulating well enough. i tried 3 different 78L10's but they were all inadequate to regulate the 10v line. My 12V battery was dropping down too close to the top requirement of the 10V regulator.
So i replaced U1 with a LM2940T-10, 1A, 10V, Low Drop Out regulator in a TO-220 package.
It also has a 22MF capacitor on the output.
The LDO regulator will keep working as my battery discharges.
(ps: My 'Tune' pot is 50K ohms).
Now  my RX freq is the same as my TX freq. My 10V line is steady now.
i will be back on the air with the BC-221 again testing it on   5 Jan  2020, 1600z, 7032 kHz.
So if you called me and i didn't answer, here is your chance to get your special "Dino" QSL card. 

The description of my Re-Purposed BC-221 is in the  NAQCC Newsletter: 

  "A Skin Deep BC-221", 

http://naqcc.info/newsletter/newsletter_257.pdf

Paul   w0rw


Re: HF Magnetic Loop and Pacemaker

WB9BKJ <dmason@...>
 

Check out the MFJ-212.


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main@4SQRP.groups.io Group Moderators <main@...>
 

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Re: HF Magnetic Loop and Pacemaker

W4OED
 

Although it is true that tuning a loop antenna while transmitting is bad for your help, it is also true that you may very well be able to tune the antenna in reception mode by listening to the noise coming from the speaker: the higher the noise level becomes the closer to the receiving frequency the antenna is.
I saw a modification for a loop antenna that used two pieces of garden hose set around the knobs that seemed to work despite of being cumbersome to setup.

Oscar
W4OED


Re: HF Magnetic Loop and Pacemaker

John
 

please send me a copy or upload into the groups?
John VE3IPS

Ham Radio is a lifestyle not a Hobby!
Take the radio outside and operate from the Field




On Fri, Jan 31, 2020 at 1:29 PM John - KK4ITX via Groups.Io <jleahy00=yahoo.com@groups.io> wrote:
Here’s a photo of a spreadsheet that I made up last October for making the QST Loop.  

image1.png

Visit:  www.zaarc.org.   👁

On Jan 31, 2020, at 13:02, John - KK4ITX via Groups.Io <jleahy00@...> wrote:

So far I have only put it through the receiving paces.  As far as I know the only time any appreciable RF would be present is when transmitting.  You coarse and then fine tune by ear, not by keying up and transmitting.  I only use the analyzer for checking as my hearing is very directional.

I took it out yesterday afternoon for an hour or so at a RF quiet park and was quite pleased with the reception.

MFJ has details and a video to explain how it works on their website.  Also QST had an article a couple of months ago dealing with making a neat loop using 450 ladder line...... you might give that a read.  I plan to try it also.

John
KK4ITX 

Visit:  www.zaarc.org.   👁

On Jan 31, 2020, at 11:30, Dan Reynolds <on30ng@...> wrote:

On Thu, Jan 30, 2020 at 09:24 AM, John - KK4ITX wrote:
MFJ-9232 QRP Pocket Loop tuner
That's pretty interesting - have you had good luck with it? And yes, I would have to tune it with an analyzer - LOL. No way I'd want to be close enough to touch those knobs with real RF going through it.  I'll bet it would work well with a loop made of hard line. Heck I could make one for each band almost. 

Now an arduino controlling that would be pretty darn cool. 
 
--
Dan Reynolds -- KB9JLO
<><


Re: HF Magnetic Loop and Pacemaker

John - KK4ITX
 

Here’s a photo of a spreadsheet that I made up last October for making the QST Loop.  

image1.png

Visit:  www.zaarc.org.   👁

On Jan 31, 2020, at 13:02, John - KK4ITX via Groups.Io <jleahy00@...> wrote:

So far I have only put it through the receiving paces.  As far as I know the only time any appreciable RF would be present is when transmitting.  You coarse and then fine tune by ear, not by keying up and transmitting.  I only use the analyzer for checking as my hearing is very directional.

I took it out yesterday afternoon for an hour or so at a RF quiet park and was quite pleased with the reception.

MFJ has details and a video to explain how it works on their website.  Also QST had an article a couple of months ago dealing with making a neat loop using 450 ladder line...... you might give that a read.  I plan to try it also.

John
KK4ITX 

Visit:  www.zaarc.org.   👁

On Jan 31, 2020, at 11:30, Dan Reynolds <on30ng@...> wrote:

On Thu, Jan 30, 2020 at 09:24 AM, John - KK4ITX wrote:
MFJ-9232 QRP Pocket Loop tuner
That's pretty interesting - have you had good luck with it? And yes, I would have to tune it with an analyzer - LOL. No way I'd want to be close enough to touch those knobs with real RF going through it.  I'll bet it would work well with a loop made of hard line. Heck I could make one for each band almost. 

Now an arduino controlling that would be pretty darn cool. 
 
--
Dan Reynolds -- KB9JLO
<><


Re: HF Magnetic Loop and Pacemaker

John - KK4ITX
 

So far I have only put it through the receiving paces.  As far as I know the only time any appreciable RF would be present is when transmitting.  You coarse and then fine tune by ear, not by keying up and transmitting.  I only use the analyzer for checking as my hearing is very directional.

I took it out yesterday afternoon for an hour or so at a RF quiet park and was quite pleased with the reception.

MFJ has details and a video to explain how it works on their website.  Also QST had an article a couple of months ago dealing with making a neat loop using 450 ladder line...... you might give that a read.  I plan to try it also.

John
KK4ITX 

Visit:  www.zaarc.org.   👁

On Jan 31, 2020, at 11:30, Dan Reynolds <on30ng@...> wrote:

On Thu, Jan 30, 2020 at 09:24 AM, John - KK4ITX wrote:
MFJ-9232 QRP Pocket Loop tuner
That's pretty interesting - have you had good luck with it? And yes, I would have to tune it with an analyzer - LOL. No way I'd want to be close enough to touch those knobs with real RF going through it.  I'll bet it would work well with a loop made of hard line. Heck I could make one for each band almost. 

Now an arduino controlling that would be pretty darn cool. 
 
--
Dan Reynolds -- KB9JLO
<><


Re: Portable Battery Recommendations

John Lonigro
 

Don:

Not designed as a QRP radio, your IC-706 draws as much current on receive as many QRP radios do on transmit.  Another important factor is the display backlight.  Measure the current with the backlight turned on and then turned off and you will see that a lot of battery life is consumed lighting the display, not operating the radio.

72,
John, AA0VE 

On 1/31/20 8:42 AM, Don, W9EBK wrote:
Based on what I'm seeing here about battery life it's time for me to get some new batteries.  I have only done 2 portable operations in the past few years with my Hilltopper 20 and Black and Decker battery.  When I did more portable work a 7.5 amp hour gel cell would only run my IC-706 set to its lowest power setting for about 90 minutes of typical operating. My 20 amp hour gel cell would go about 4 hours. 
Looks like it's time to go shopping for lithium batteries and maybe a more efficient radio.
Don, W9EBK 

On Thu, Jan 30, 2020, 12:52 PM Jim <n0oct@...> wrote:
On Thu, Jan 30, 2020 at 11:28 AM, Don, W9EBK wrote:
You are going to need 30 to 40 amp hours to do what you want,  with no worries.
For an Argonaut IV or KX2, a 30Ah battery will last a couple of weeks!  For an afternoon's operating, see what other folks who are running QRP on this thread have mentioned.  I have an old Hawker Cyclon cell (4Ah) and a couple of newish SLA (4.5Ah), and in my busiest SOTA operating day I have never drained them enough for the power to cut back on my KX3, running 5-10W.


Re: Portable Battery Recommendations

Greg Troxel
 

"John" <johnk5mo@...> writes:

The other consideration with large lithium batteries is that they're
potentially (!) a bomb. I'd be pretty careful about transporting and using
them so as not to damage them and cause an explosion/fire. Then there's
expense.
Because of this, I avoid lithium ion batteries. When I do use them, I
only charge them while I am around, and I have careful to avoid
mechanical damage. I would not want to use polymer cells without full
mechanical protection. I have heard many horror stories about lithium
ion batteries and fires.

Lithium iron phosphase (LiFePO4) is a different chemistry and is far
safer. I have not heard about these being implicated in
fires/explosions.

I have two Bioenno LiFePO4 batteries, and they have behaved well. They
have an internal controller for balancing and overcharge/overdischarge
protection.

73 de n1dam


Re: HF Magnetic Loop and Pacemaker

Dan Reynolds
 

On Thu, Jan 30, 2020 at 09:24 AM, John - KK4ITX wrote:
MFJ-9232 QRP Pocket Loop tuner
That's pretty interesting - have you had good luck with it? And yes, I would have to tune it with an analyzer - LOL. No way I'd want to be close enough to touch those knobs with real RF going through it.  I'll bet it would work well with a loop made of hard line. Heck I could make one for each band almost. 

Now an arduino controlling that would be pretty darn cool. 
 
--
Dan Reynolds -- KB9JLO
<><


Re: HF Magnetic Loop and Pacemaker

Dan Reynolds
 

Yeah, I knew you guys were joking. And I have spoken with the MFR. The major "danger" is not that it will fail but more that the electrical "interference" will screw up the programming. I'm on my 2nd one (atrial fib) and actually just about due for my 3rd. I'm sure they have backups but I don't want to mess with the programming. It works well now. And magnetic fields and sparking/arcing are the things most worrisome. For example if you do arc weld you're never to put the leads over your shoulder - keep them as far away from your chest as you can. And with a running car - you shouldn't get your hands near the spark plug leads. I don't weld anymore. It was only a hobby thing at best. Working on cars I obey that rule to max. 

I know the suggestion was to talk to the MFR but I can't imagine many of them understanding what a transmitting mag loop antenna is. I have a Medtronics device, single lead. I am 100% paced and in the procedure they ablated the AV mode to "disconnect" the top from the bottom parts of the heart.  I had mine implanted before they had come up with better alternative treatments for a-fib. A pacemaker is not very common for that now. Other than those few precautions I would say I'm better than new! 
--
Dan Reynolds -- KB9JLO


Re: Portable Battery Recommendations

John
 

I use the Bioenno batteries from the 3a up to 12A. I love that they are 13.8V
John VE3IPS

Ham Radio is a lifestyle not a Hobby!
Take the radio outside and operate from the Field




On Fri, Jan 31, 2020 at 9:52 AM John <johnk5mo@...> wrote:
30 AH is way overkill for a QRP rig (the 706, which i have too, is NOT thrifty with power).   An efficient QRP rig will run 4 hours off a 7AH gel cell without any problem at all. 

The other consideration with large lithium batteries is that they're potentially (!) a bomb. I'd be pretty careful about transporting and using them so as not to damage them and cause an explosion/fire. Then there's expense.

Thrifty current sipping radios make for small battery needs.  Things like digital displays, synthesized tuning, etc are power hogs without a lot of value in QRP field operations, compared to the significant value of being battery efficient.

John K5MO

On Fri, Jan 31, 2020 at 9:42 AM Don, W9EBK <donw9ebk@...> wrote:
Based on what I'm seeing here about battery life it's time for me to get some new batteries.  I have only done 2 portable operations in the past few years with my Hilltopper 20 and Black and Decker battery.  When I did more portable work a 7.5 amp hour gel cell would only run my IC-706 set to its lowest power setting for about 90 minutes of typical operating. My 20 amp hour gel cell would go about 4 hours. 
Looks like it's time to go shopping for lithium batteries and maybe a more efficient radio.
Don, W9EBK 

On Thu, Jan 30, 2020, 12:52 PM Jim <n0oct@...> wrote:
On Thu, Jan 30, 2020 at 11:28 AM, Don, W9EBK wrote:
You are going to need 30 to 40 amp hours to do what you want,  with no worries.
For an Argonaut IV or KX2, a 30Ah battery will last a couple of weeks!  For an afternoon's operating, see what other folks who are running QRP on this thread have mentioned.  I have an old Hawker Cyclon cell (4Ah) and a couple of newish SLA (4.5Ah), and in my busiest SOTA operating day I have never drained them enough for the power to cut back on my KX3, running 5-10W.


Re: Portable Battery Recommendations

John
 

30 AH is way overkill for a QRP rig (the 706, which i have too, is NOT thrifty with power).   An efficient QRP rig will run 4 hours off a 7AH gel cell without any problem at all. 

The other consideration with large lithium batteries is that they're potentially (!) a bomb. I'd be pretty careful about transporting and using them so as not to damage them and cause an explosion/fire. Then there's expense.

Thrifty current sipping radios make for small battery needs.  Things like digital displays, synthesized tuning, etc are power hogs without a lot of value in QRP field operations, compared to the significant value of being battery efficient.

John K5MO

On Fri, Jan 31, 2020 at 9:42 AM Don, W9EBK <donw9ebk@...> wrote:
Based on what I'm seeing here about battery life it's time for me to get some new batteries.  I have only done 2 portable operations in the past few years with my Hilltopper 20 and Black and Decker battery.  When I did more portable work a 7.5 amp hour gel cell would only run my IC-706 set to its lowest power setting for about 90 minutes of typical operating. My 20 amp hour gel cell would go about 4 hours. 
Looks like it's time to go shopping for lithium batteries and maybe a more efficient radio.
Don, W9EBK 

On Thu, Jan 30, 2020, 12:52 PM Jim <n0oct@...> wrote:
On Thu, Jan 30, 2020 at 11:28 AM, Don, W9EBK wrote:
You are going to need 30 to 40 amp hours to do what you want,  with no worries.
For an Argonaut IV or KX2, a 30Ah battery will last a couple of weeks!  For an afternoon's operating, see what other folks who are running QRP on this thread have mentioned.  I have an old Hawker Cyclon cell (4Ah) and a couple of newish SLA (4.5Ah), and in my busiest SOTA operating day I have never drained them enough for the power to cut back on my KX3, running 5-10W.


Re: Portable Battery Recommendations

Don, W9EBK
 

Based on what I'm seeing here about battery life it's time for me to get some new batteries.  I have only done 2 portable operations in the past few years with my Hilltopper 20 and Black and Decker battery.  When I did more portable work a 7.5 amp hour gel cell would only run my IC-706 set to its lowest power setting for about 90 minutes of typical operating. My 20 amp hour gel cell would go about 4 hours. 
Looks like it's time to go shopping for lithium batteries and maybe a more efficient radio.
Don, W9EBK 

On Thu, Jan 30, 2020, 12:52 PM Jim <n0oct@...> wrote:
On Thu, Jan 30, 2020 at 11:28 AM, Don, W9EBK wrote:
You are going to need 30 to 40 amp hours to do what you want,  with no worries.
For an Argonaut IV or KX2, a 30Ah battery will last a couple of weeks!  For an afternoon's operating, see what other folks who are running QRP on this thread have mentioned.  I have an old Hawker Cyclon cell (4Ah) and a couple of newish SLA (4.5Ah), and in my busiest SOTA operating day I have never drained them enough for the power to cut back on my KX3, running 5-10W.


Re: Recommendations for electronics books

Tommy Henderson
 

Nice Thread,

I would also have to say, RF Circuit Design by Bowick is in my top 3. Here are my top 8:

  1. RF Circuit Design: Bowick, ISBN# 0-672-21868-2 (this is my first one I picked up in 1986)
  2. RF Circuit Design: Bowick, #9780750685184. (second ed ~ 2005, some added material, either one will do the job)
  3. The Art of ElectronicsHorowitz and Winfield # ISBN 978-0521809269 (3rd Ed, however any old edition will due!) Great book, It could be first in this list, I just placed it here as it is used as a reference book, not part of a class. The book is written through a teaching perspective.)
  4. Radio Frequency Design: Hayward, #0-87259-492-0
  5. Experimental Methods in RF Design: Bob Larkin, Rick Campbell, and Wes Hayward, #978-0-87259-923-9 (Either of these Design Books, this one covers a bit more). 
  6. Principles of Electric Circuits: Thomas L. Floyd; David M. Buchla, #9780134879482 (good basic coverage text book of DC and AC theory w/o calculus).
  7. Principles of Electronic Communication Systems: Frenzel, #9780073373850 (another good basic coverage, text book)
  8. Older ARRL Handbooks, I keep 2 from every decade beginning from the 70's, they come in handy

Tommy - WD5AGO


Re: 40 AND 80 METER NET REPORT

w2sh@...
 

Thank you,Jeff.

We were in CA visiting our daughter, so missed the January SSS.  It appears that condx were really awful.

I'll try to add some excitement to February's event.  Hope to BCNU then.

72,

Charles (aka Chas), W2SH


From: main@4SQRP.groups.io <main@4SQRP.groups.io> on behalf of Jeff Logullo N0̸MII <jeff@...>
Sent: Wednesday, January 29, 2020 23:55
To: main@4sqrp.groups.io <main@4sqrp.groups.io>
Subject: Re: [4SQRP] 40 AND 80 METER NET REPORT
 
Hi Chas! Good to hear from you!

Missed you on last month’s Sexond Sunday Sprint. I always could count on hearing you... alas, no Chas. Hope all is well! And i hope to work you next month :-)

72,
Jeff N0̸MII 

On Jan 29, 2020, at 9:42 PM, w2sh@... wrote:


Prior to the start of the 40m net, WNØWWY was heard with 579.  Also N4MJ with whom I had short exchange was 579.  WB1GYZ exchanged briefly with WNØWWY.  I could hear WB!GYZ's signal but it was not readable here, being only 100 miles distant.

On 80m The QNI procedure was pretty ragged and things sounded like a QRM fest for much of he time.  N4HAY was 589 here (note his correct call sign).

72,

Charles (aka Chas), W2SH


From: main@4SQRP.groups.io <main@4SQRP.groups.io> on behalf of Johnny Matlock <jomatlock@...>
Sent: Wednesday, January 29, 2020 22:11
To: 4sqrpio <4SQRP@groups.io>
Subject: [4SQRP] 40 AND 80 METER NET REPORT
 
GE GROUP 
40 WAS ONLY FAIR AS USUAL. 

CHECK IN'S WERE:
WB1GYZ
W2SH

80 METER CHECK IN'S WERE 
N0YJ 
N4MJ
WB0CFF
N4HAM 
W2SH 
THANKS EVERYONE 
CU AT OZARKCON SOON! 


--
QRP....."More smiles per Watt"
72
JOHNNY AC0BQ  ..



--
Charles Moizeau, W2SH

--
Jeff N0̷MII

--
Charles Moizeau, W2SH


Re: HF Magnetic Loop and Pacemaker

Jim Sheldon
 

Hey John, I was actually just joking with you, but your point even though humorous was well spoken.  Thanks for thinking of those of us who are getting older and have such accessories as pacemakers keeping us active.  No need to apologize.  

Jim - W0EB

------ Original Message ------
From: "John Lonigro" <jonigro@...>
Sent: 1/30/2020 12:50:47 PM
Subject: Re: [4SQRP] HF Magnetic Loop and Pacemaker

I'm sorry.  I didn't intend to be morbid.  My point was that, to be safe, the person with a pacemaker should check with the manufacturer of his device as well as with his doctor.

Reminder: The February Second Sunday Sprint is a little more than a week away.

72,

John, AA0VE

On 1/30/20 10:00 AM, Jim Sheldon wrote:
Morbidly funny John, but really, a good point.  Some info on at least one brand of pacemaker (the one I have).

I too have a pacemaker.  I often run 500 watts and one end of the 160-80-40 meter antenna runs right over the shack, about 3 feet above the house roof.  My pacemaker is from "Boston Scientific", has bluetooth connectivity to a remote monitor that lets my cardiologist know immediately if something goes wrong with either ME or the pacemaker.  I'm on the air almost daily for at least one QRO contact on 40 meters and in over 12 years, have had no RF episodes with the pacemaker.

My Boston Scientific rep said the main thing to avoid is high magnetic fields as a coded magnetic signal is used to trigger diagnostic mode in their pacemakers so a Mag Loop might be a different ball game entirely.  I don't have one here but then I have a 40' telescoping vertical that collapses down to 3 feet for my portable operations when I even go portable anymore - LOL.

That being said, I agree with the need to use CAUTION when operating close to radiated fields of any kind when one has a pacemaker implant as I'm sure the manufacturers all use different RF and Magnetic exposure standards from each other and results will surely vary.  Best to err on the side of safety.


Jim, W0EB

------ Original Message ------
From: "John Lonigro" <jonigro@...>
Sent: 1/30/2020 9:42:39 AM
Subject: Re: [4SQRP] HF Magnetic Loop and Pacemaker

Start with 1 Watt, then go with 2 Watts, etc.  If you die, back down a Watt (hi).

John, AA0VE

On 1/30/20 9:24 AM, John - KK4ITX via Groups.Io wrote:
I use the MFJ-9232 QRP Pocket Loop tuner and find it a useful setup to eliminate the local noise.  There are several YouTube videos showing good results but beware...... they were made when there were sun spots.  I had great fun rigging up the expansion arrangement to allow for various lengths of wire.  To get a broader bandwidth I used trailer hookup wire, seems to work better than the wire that came with it.

The supports are driveway markers and I really lucked out at a Flea Market with the $4.00 heavy duty tri-pod.  I have attached a picture of the assembled unit if anyone is interested I have more and some additional hints and details to offer.

As for use with a pacemaker ?  You will know if it is bothering you or anyone else I believe.  When I tune up I am listening (RX) or using my Sark 100 so there’s no large amount of RF present....... Operating (TX) one would be several feet away so at 5w I doubt that you would be affected but just go at it slow (1-2w) and see what happens.

Enjoy,

John
KK4ITX 
image1.jpeg

Visit:  www.zaarc.org.   👁

On Jan 29, 2020, at 22:18, Dan Reynolds <on30ng@...> wrote:

I have access to some hardline and I'm thinking about making  a transmitting loop. I know there was a design out there that used an Arudino to tune the loop at frequency changes... 
Anybody have some decent designs - I do not want to design it myself. I'm not too proud to borrow someone else's work. 

Also, does anyone know about any problems with a transmitting mag loop and a pacemaker (QRP levels only). 

--
Dan Reynolds -- KB9JLO



Re: Recommendations for electronics books

John Clements
 

I like RF Circuit Design by Christopher Bowick.  He includes design exercises to go along with the theory.  There are a couple of the same title so make sure to also look for the author.
72 John kc9on


Re: Portable Battery Recommendations

John - KK4ITX
 

Larry, we enjoy the effort that's put in to benefit the QRP world by all of the organizers and it's all way too much fun even if contacts are minimal.

Thanks for what you do,

John
Skeeter 38 (2019)
KK4ITX





Larry Makoski <w2ljqrp@...>
To:main@4SQRP.groups.io
Jan 30 at 1:58 PM

I'm lovin' the logo that's in the top of that ammo box!

Just sayin'.

Larry W2LJ




Click Here for Zephyrhills Area Amateur Radio Club
Many of life's failures are people who
did not realize how close they were to
success when they gave up.
       Thomas A. Edison     


On Thursday, January 30, 2020, 01:58:29 PM EST, Larry Makoski <w2ljqrp@...> wrote:


I'm lovin' the logo that's in the top of that ammo box!

Just sayin'.

Larry W2LJ

On Thu, Jan 30, 2020 at 1:19 PM Tim N9PUZ <tim.n9puz@...> wrote:
In terms of battery technologies disregarding cost I'd rank them:
1. LiFePO4 (Bioenno, Dakota Lithium)
2. LiPo
3. NiCd
4. Sealed Lead Acid

You can use this calculator to estimate your battery needs:


"Depth of Discharge" is an important factor for run time. Use these values:

LiFePO4 - 90%
LiPo - 80%
NiCd - 75%
SLA - 50%

I have a 3Ah Bioenno LiFePO4 pack that I use with my KX2.

Tim N9PUZ


On Thu, Jan 30, 2020 at 10:43 AM Richard AG5M via Groups.Io <ag5m=yahoo.com@groups.io> wrote:
I loved the discussion about Portable Antennas, learned quite a few new ideas to try out.  Now for another.  To power my Ten-Tec Argo IV QRP rig (or a KX2 if I ever get one) out in the field, what kind of light weight battery would you all recommend that could power the rig, running 5 watts, for up to four hours CW and SSB.  I have a sealed Gel-Cell but it's kinda heavy.  Appreciate all your thoughts.  72, Richard AG5M.