Date   

Re: Monday Night SSB Net SWL Report

Richard Dickerson
 

I heard someone calling the net but no one heard my answer. Lots of noise though

Richard
WF2F

Sent from my iPhone

On May 11, 2015, at 20:40, dekle@... [4sqrp] <4sqrp@...> wrote:

 

I heard Wayne (KC0PMH) call CQ twice.

He was 59 here, making it over the S7 noise nicely.

Nothing else heard.


73

Bill

KV6Z




Re: Field Day

Charles W. Powell
 

Here it is out of the rules:

7.1. QSO Points:

7.1.1. Phone contacts count one point each. 7.1.2. CW contacts count two points each. 7.1.3. Digital contacts count two points each.

7.2. Power multipliers: The power multiplier that applies is determined by the highest power output of any of the transmitters used during the Field Day operation.

7.2.1. If all contacts are made using a power of 5 Watts or less and if a power source other than commercial mains or motor-driven generator is used (batteries, solar cells, water-driven generator), the power multiplier is 5 (five).
7.2.2. If all contacts are made using a power of 5 Watts or less, but the power source is from a commercial main or from a motor-driven generator, the power multiplier is 2. If batteries are charged during the Field Day period using commercial mains or a motor-driven generator the power multiplier is 2 (two).

7.2.3. If any or all contacts are made using an output power up to 150 Watts or less, the power multiplier is 2 (two).
7.2.4. If any or all contacts are made using an output power greater than 150 Watts, the power multiplier is 1 (one).

7.2.5. The power multiplier for an entry is determined by the maximum output power used by any transmitter used to complete any contact during the event. (Example: a group has one QRP station running 3 Watts and a second station running 100 Watts, the power multiplier of 2 applies to all contacts made by the entire operation).

72,

Chas 

On May 11, 2015, at 19:54, 'Joshua Gould, K8WXA' jg.k8wxa@... [4sqrp] <4sqrp@...> wrote:

 

I'm watching this thread with interest as I'm still trying to decide if I am going to do field day on my own or see what the ARES group I'm active with is doing. Is 5 watts all the ARRL considers QRP?

72,
Joshua Gould
K8WXA
EM89pn

KX3# 7480
NAQCC # 7704
OMISS # 9948
4SQRP # 990

This message was sent from an iPhone. Please excuse any typos and the brevity of responses

On May 11, 2015, at 21:31, Johnny Matlock jomatlock@... [4sqrp] <4sqrp@...> wrote:

 

Hello CHAS

Your on the right track already!
Power your radio from battey and use 5 watts, that's the legal part as far as I know!
Keep your antenna's simple, vertical, inverted VEE, G5rv junior, inverted L all seem to work well. We have tried several through the years and some play better than others.
The idea of having one for close range like a NVIS is good but any the above work well.
Logging can be done on paper, but a computer with logging software sorts out the dupes!
Scott N3JFP sells a great field day logging program, no vested intrest, just a satisfied customer.
I'm not sure the ARRL cares about the power for your computer, but I may stand corrected.
If they do, run it from battery also?
You are correct on telling them your are QRP, some QRO operators go deaf if you do!

Just go set up fight the bugs and have fun!!
Don't forget to bring food, that's the best part!
72
Johnny AC0BQ 

On Monday, May 11, 2015, doctorcwp@... [4sqrp] <4sqrp@...> wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O







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





Re: Field Day

dave <ho13dave@...>
 

I'm not sure the ARRL cares about the power for your computer, but I
may stand corrected.
I can't quote the exact phrase the ARRL uses . . . but . . . if the
computer keys the rig it must be battery powered (or generator, if not
QRP). This assumes you are running as a field station. Would be
different for some of the other categories.

If the computer is used only for logging, no keying of the rig or
otherwise driving the TX, it can run off mains power.

Any digital operations that use the pc sound card would need to be
battery/generator powered.

Read over the rules carefully, all this is in there. Check the FAQ's.

73 de dave
ab9ca/4



On 5/11/15 8:31 PM, Johnny Matlock jomatlock@gmail.com [4sqrp] wrote:


Hello CHAS
Your on the right track already!
Power your radio from battey and use 5 watts, that's the legal part as
far as I know!
Keep your antenna's simple, vertical, inverted VEE, G5rv junior,
inverted L all seem to work well. We have tried several through the
years and some play better than others.
The idea of having one for close range like a NVIS is good but any the
above work well.
Logging can be done on paper, but a computer with logging software
sorts out the dupes!
Scott N3JFP sells a great field day logging program, no vested
intrest, just a satisfied customer.
I'm not sure the ARRL cares about the power for your computer, but I
may stand corrected.
If they do, run it from battery also?
You are correct on telling them your are QRP, some QRO operators go
deaf if you do!

Just go set up fight the bugs and have fun!!
Don't forget to bring food, that's the best part!
72
Johnny AC0BQÂ

On Monday, May 11, 2015, doctorcwp@yahoo.com
<mailto:doctorcwp@yahoo.com> [4sqrp] <4sqrp@yahoogroups.com
<mailto:4sqrp@yahoogroups.com>> wrote:

__
Â

I am free for Field Day this year (how did it happen?) so I’m
going to operate QRP 1B-battery. The lure of 10 points per QSO
is pretty strong. Does anyone have any recommendations for setting
up a station? I have the KX3, so the radio is not a problem. I
need to do a little site survey, but where I am considering I can
set up a near vertical long wire. As a second antenna, I was
thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the
past, i.e., call CQ, don't act like you're QRP, and just go for
it. Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its
battery. It's legal to power the computer with a generator, but
I don't have one. Maybe I should try to find a 12 volt inverter
to charge from the car battery? I checked with ARRL a few years
ago and this is legal, as long as you don't use the motorized
generators to power the radio.


Comments?


Chas - NK8O






--
QRP....."more smiles per watt"
72
JOHNNY AC0BQÂ ..




Re: Field Day

Joshua Gould, K8WXA <jg.k8wxa@...>
 

I'm watching this thread with interest as I'm still trying to decide if I am going to do field day on my own or see what the ARES group I'm active with is doing. Is 5 watts all the ARRL considers QRP?

72,
Joshua Gould
K8WXA
EM89pn

KX3# 7480
NAQCC # 7704
OMISS # 9948
4SQRP # 990

This message was sent from an iPhone. Please excuse any typos and the brevity of responses

On May 11, 2015, at 21:31, Johnny Matlock jomatlock@... [4sqrp] <4sqrp@...> wrote:

 

Hello CHAS

Your on the right track already!
Power your radio from battey and use 5 watts, that's the legal part as far as I know!
Keep your antenna's simple, vertical, inverted VEE, G5rv junior, inverted L all seem to work well. We have tried several through the years and some play better than others.
The idea of having one for close range like a NVIS is good but any the above work well.
Logging can be done on paper, but a computer with logging software sorts out the dupes!
Scott N3JFP sells a great field day logging program, no vested intrest, just a satisfied customer.
I'm not sure the ARRL cares about the power for your computer, but I may stand corrected.
If they do, run it from battery also?
You are correct on telling them your are QRP, some QRO operators go deaf if you do!

Just go set up fight the bugs and have fun!!
Don't forget to bring food, that's the best part!
72
Johnny AC0BQ 

On Monday, May 11, 2015, doctorcwp@... [4sqrp] <4sqrp@...> wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O






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


Re: SSB?

Martin Huyett <huyettmeh@...>
 

I listened for about ten minutes at 8:30pm CDT. I thought I heard a station but not at all copyable.  I had just worked a Maritime Mobile Service Net station in Oklahoma with 5 watts on 14.300 so I know my rig was working!

 

73

 

Martin

K0BXB

www.huyettm.net

 

 

 

 

From: 4sqrp@... [mailto:4sqrp@...]
Sent: Monday, May 11, 2015 4:18 PM
To: 4sqrp@...; Wayne Dillon
Subject: Re: [4sqrp] SSB?

 

 

If you can, try SSB on 7.285 tonight...7:30 and 8:30 CDT.  This Monday night SSB net has been trying to get off the ground.  I plan to try 8:30 for sure and maybe 7:30 if we are finished with supper.


_ _ ...   .. _ _ _


Doc K5OSA - QTH: EM04sr
ARRL  
4SQRP #801 - NAQCC #7625 - SKCC #10098

FISTS #17157 - OMISS #9886
LFSARC (Lawton/Fort Sill Amateur Radio Club)

Michael T McEwen
Lt Col, US Army, Ret

 

Cellular Phone:  580 919-9205

Residence:  580 529-3412

 

 

On Mon, May 11, 2015 at 7:14 AM, Wayne Dillon wayne.dillon@... [4sqrp] <4sqrp@...> wrote:

 

I'll see if I can persuade my antenna on to 17m and then I'll report back (I'll listen out as well).

have a blessed day

Wayne - KC0PMH

 

--

http://www.qsl.net/kc0pmh/   Under construction but please visit anyway.

 

QRP -  EFFICIENCY AND SKILL, NOT POWER. 

 

I'm British by birth but American by CHOICE!

Jesus came to pay a debt He didn't owe because we owe a debt we cannot pay...

The Lord bless you and keep you
The Lord make His face shine upon you, and be gracious unto you
The Lord lift up his contenance upon you and give you peace.


God Bless from Wayne Dillon - KC0PMH

Joshua 24:14-15
2 Cor 5:17
1 Jn 2:17

 

Membership Chairman - 4SQRP Group
4SQRP #95

FISTS 17184

FPQRP #342 (Flying Pigs QRP Club)

NAQCC # 0759
QRP-ARCI #11505
SKCC #1155T

CW Ragchewers Anonymous #40
SOC #848
30MDG#1176

NEQRP #693

GORC #192

DMC (Digital Modes Club) # 06686

 


Re: Field Day

Johnny AC0BQ
 

Hello CHAS
Your on the right track already!
Power your radio from battey and use 5 watts, that's the legal part as far as I know!
Keep your antenna's simple, vertical, inverted VEE, G5rv junior, inverted L all seem to work well. We have tried several through the years and some play better than others.
The idea of having one for close range like a NVIS is good but any the above work well.
Logging can be done on paper, but a computer with logging software sorts out the dupes!
Scott N3JFP sells a great field day logging program, no vested intrest, just a satisfied customer.
I'm not sure the ARRL cares about the power for your computer, but I may stand corrected.
If they do, run it from battery also?
You are correct on telling them your are QRP, some QRO operators go deaf if you do!

Just go set up fight the bugs and have fun!!
Don't forget to bring food, that's the best part!
72
Johnny AC0BQ 

On Monday, May 11, 2015, doctorcwp@... [4sqrp] <4sqrp@...> wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O






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


Re: Monday Night SSB Net SWL Report

Joshua Gould, K8WXA <jg.k8wxa@...>
 

I would have been there, but I have the radios unhooked because of storms rolling through. 

72,
Joshua Gould
K8WXA
EM89pn

KX3# 7480
NAQCC # 7704
OMISS # 9948
4SQRP # 990

This message was sent from an iPhone. Please excuse any typos and the brevity of responses

On May 11, 2015, at 20:44, 'John R. Lonigro' jonigro@... [4sqrp] <4sqrp@...> wrote:

 

I heard nothing.  I'll listen at 8:30 as well.

72, John AA0VE

On 05/11/2015 07:40 PM, dekle@... [4sqrp] wrote:
 

I heard Wayne (KC0PMH) call CQ twice.

He was 59 here, making it over the S7 noise nicely.

Nothing else heard.


73

Bill

KV6Z





Re: Low Cost Dummy Load

dekle <dekle@...>
 


HI.
 

----- Original Message -----
Sent: Monday, May 11, 2015 7:45 PM
Subject: [4sqrp] Re: Low Cost Dummy Load

 

New development. I usually do resistance measurements with the setting on my meter that zeros out the lead resistance. The meter has another resistance setting that does not remove the lead resistance. I used that setting with a set of very short clip on leads. and the meter read 50.0 ohms. I think the resistance is close enough. I am working on a bigger heatsink though.
Darryl, KK5IB


Re: Low Cost Dummy Load

Darryl J Kelly
 

New development. I usually do resistance measurements with the setting on my meter that zeros out the lead resistance. The meter has another resistance setting that does not remove the lead resistance. I used that setting with a set of very short clip on leads. and the meter read 50.0 ohms. I think the resistance is close enough. I am working on a bigger heatsink though.
Darryl, KK5IB


Re: Monday Night SSB Net SWL Report

John Lonigro
 

I heard nothing.  I'll listen at 8:30 as well.

72, John AA0VE

On 05/11/2015 07:40 PM, dekle@... [4sqrp] wrote:
 

I heard Wayne (KC0PMH) call CQ twice.

He was 59 here, making it over the S7 noise nicely.

Nothing else heard.


73

Bill

KV6Z





Re: Monday Night SSB Net SWL Report

Wayne Dillon
 

Good to know that, A) I found the Mic and B) it works, though the spiders got pretty ticked off at being yelled at!
Blessings
Wayne - KC0PMH

On Mon, May 11, 2015 at 7:40 PM, dekle@... [4sqrp] <4sqrp@...> wrote:
 

I heard Wayne (KC0PMH) call CQ twice.

He was 59 here, making it over the S7 noise nicely.

Nothing else heard.


73

Bill

KV6Z






--
http://www.qsl.net/kc0pmh/   Under construction but please visit anyway.
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
I'm British by birth but American by CHOICE!

Jesus came to pay a debt He didn't owe because we owe a debt we cannot pay...

The Lord bless you and keep you
The Lord make His face shine upon you, and be gracious unto you
The Lord lift up his contenance upon you and give you peace.

God Bless from Wayne Dillon - KC0PMH

Joshua 24:14-15
2 Cor 5:17
1 Jn 2:17
 
Membership Chairman - 4SQRP Group
4SQRP #95
FISTS 17184
FPQRP #342 (Flying Pigs QRP Club)
NAQCC # 0759
QRP-ARCI #11505
SKCC #1155T
CW Ragchewers Anonymous #40
SOC #848
30MDG#1176
NEQRP #693
GORC #192
DMC (Digital Modes Club) # 06686


Re: Field Day

Wayne Dillon
 

Chas,
You're in seriously good company!
Blessings
Wayne - KC0PMH

On Mon, May 11, 2015 at 7:36 PM, Charles Powell doctorcwp@... [4sqrp] <4sqrp@...> wrote:
 

I’m a crazy old CW op.  No PSK or RTTY for me.


72,

Chas - NK8O


On May 11, 2015, at 18:26, John R. Lonigro <jonigro@...> wrote:

Chas:

1) Calling CQ at 5W might be tough.  If you can do it, go for it, but chances are someone else won't hear you, will think the frequency is clear, and will be on top of your signal.  The bands are very crowded on Field Day.  Our club (St. Louis QRP Society) uses "Search and Pounce" almost exclusively.

You are correct that you can power the laptop from the mains, as long as you aren't using it for digital communication.  Performing logging using commercial mains or a generator won't affect your 10 pts/QSO.  If you use it for PSK or RTTY or other digital modes, that's a different story.

Good luck and 72,

John AA0VE

On 05/11/2015 06:53 PM, doctorcwp@... [4sqrp] wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O









--
http://www.qsl.net/kc0pmh/   Under construction but please visit anyway.
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
I'm British by birth but American by CHOICE!

Jesus came to pay a debt He didn't owe because we owe a debt we cannot pay...

The Lord bless you and keep you
The Lord make His face shine upon you, and be gracious unto you
The Lord lift up his contenance upon you and give you peace.

God Bless from Wayne Dillon - KC0PMH

Joshua 24:14-15
2 Cor 5:17
1 Jn 2:17
 
Membership Chairman - 4SQRP Group
4SQRP #95
FISTS 17184
FPQRP #342 (Flying Pigs QRP Club)
NAQCC # 0759
QRP-ARCI #11505
SKCC #1155T
CW Ragchewers Anonymous #40
SOC #848
30MDG#1176
NEQRP #693
GORC #192
DMC (Digital Modes Club) # 06686


Monday Night SSB Net SWL Report

dekle@...
 

I heard Wayne (KC0PMH) call CQ twice.

He was 59 here, making it over the S7 noise nicely.

Nothing else heard.


73

Bill

KV6Z




Re: Field Day

Charles W. Powell
 

I’m a crazy old CW op.  No PSK or RTTY for me.

72,

Chas - NK8O


On May 11, 2015, at 18:26, John R. Lonigro <jonigro@...> wrote:

Chas:

1) Calling CQ at 5W might be tough.  If you can do it, go for it, but chances are someone else won't hear you, will think the frequency is clear, and will be on top of your signal.  The bands are very crowded on Field Day.  Our club (St. Louis QRP Society) uses "Search and Pounce" almost exclusively.

You are correct that you can power the laptop from the mains, as long as you aren't using it for digital communication.  Performing logging using commercial mains or a generator won't affect your 10 pts/QSO.  If you use it for PSK or RTTY or other digital modes, that's a different story.

Good luck and 72,

John AA0VE

On 05/11/2015 06:53 PM, doctorcwp@... [4sqrp] wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O







Re: Field Day

John Lonigro
 

Chas:

1) Calling CQ at 5W might be tough.  If you can do it, go for it, but chances are someone else won't hear you, will think the frequency is clear, and will be on top of your signal.  The bands are very crowded on Field Day.  Our club (St. Louis QRP Society) uses "Search and Pounce" almost exclusively.

You are correct that you can power the laptop from the mains, as long as you aren't using it for digital communication.  Performing logging using commercial mains or a generator won't affect your 10 pts/QSO.  If you use it for PSK or RTTY or other digital modes, that's a different story.

Good luck and 72,

John AA0VE

On 05/11/2015 06:53 PM, doctorcwp@... [4sqrp] wrote:
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O






Re: SSB?

Richard Dickerson
 

I'll try but QRN9+

Sent from my iPhone

On Apr 20, 2015, at 20:48, Michael McEwen mcewenk5osa@... [4sqrp] <4sqrp@...> wrote:

 

Am on 7.285 and vicinity...do no hear anyone from 4sqrp.  Also, nothing on QRPSPOTS...Is the net running?
72,
Doc K5OSA - QTH: EM04sr
ARRL  
4SQRP #801 - NAQCC #7625 - SKCC #10098 - FISTS #17157 - OMISS #9886
LFSARC (Lawton/Fort Sill Amateur Radio Club)

Michael T McEwen
Lt Col, US Army, Ret

Cellular Phone:  580 919-9205
Residence:  580 529-3412


Re: Low Cost Dummy Load [1 Attachment]

dekle <dekle@...>
 


To maintain the 100w power rating, the 2133.3 Ohm parallel resistor only has to be rated for 1.84 w.
 
Bill
KV6Z
 
 

----- Original Message -----
Sent: Monday, May 11, 2015 1:49 PM
Subject: [4sqrp] Low Cost Dummy Load [1 Attachment]

 

This is my new low cost dummy load, made with a Caddock thick film non-inductive resistor. This one is 50 ohms at 1%, and rated at 100 watts, and costs about $11.00 from Mouser or Digikey. I realize the current heat sink will not be adequate for 100 watts, but it will suffice for the 5 and 50 watt calibrations of my K3, it does get warm to the touch. Only problem is resistance measures 51.2 ohms. What value of a parallel resistor would bring that down to 50 ohms? I calculate 1234.56 ohms or 1.2 K. Is that right? Also what would the power rating of the resistor need to be? Thanks.

Darryl, KK5IB


Field Day

Charles W. Powell
 

I am free for Field Day this year (how did it happen?) so I’m going to operate QRP 1B-battery.  The lure of 10 points per QSO is pretty strong. Does anyone have any recommendations for setting up a station?  I have the KX3, so the radio is not a problem.  I need to do a little site survey, but where I am considering I can set up a near vertical long wire.  As a second antenna, I was thinking about hanging a very large horizontal loop for NVIS.


I read some of the information that Terry WA0ITP posted in the past, i.e., call CQ, don't act like you're QRP, and just go for it.  Sound advice.


Also, my laptop, a Macbook Air, only lasts 5 or 6 hours on its battery.  It's legal to power the computer with a generator, but I don't have one.  Maybe I should try to find a 12 volt inverter to charge from the car battery?  I checked with ARRL a few years ago and this is legal, as long as you don't use the motorized generators to power the radio.


Comments?


Chas - NK8O





Re: Low Cost Dummy Load

Don Wilhelm <w3fpr@...>
 

A quick approximation is that the 2133 ohm resistor will carry approximately 1/40th of the total power - so for a full 100 watt rating a 2.5 watt resistor will do.
5 426 ohm 1/2 watt resistors will do the job fine.  You might just want to use 5 470 ohm resistors in series and call it 'good enough' (50.13333 ohms).

73,
Don W3FPR


On 5/11/2015 7:28 PM, 'dekle' dekle@... [4sqrp] wrote:
 



Darryl:,
 
Let 'x' = the value of a resistor in parallel with a 51.2 Ohm resistor to yield 50 ohms equivalent resistance.
 
50 = 51.2 x / (51.2 + x)     (Product over the sum for 2 resistors in parallel.)
2560  +  50 x = 51.2 x       (Multiply both sides by (51.2 + x)).
2560 = 1.2 x                      (Subtract 50 x from both sides.)
x = 2133.3 ohms                (Divide both sides by 1.2)
 
Power rating coming soon........
 
73
Bill
KV6Z
 
 
 
 
----- Original Message -----
Sent: Monday, May 11, 2015 1:49 PM
Subject: [4sqrp] Low Cost Dummy Load [1 Attachment]

 

This is my new low cost dummy load, made with a Caddock thick film non-inductive resistor. This one is 50 ohms at 1%, and rated at 100 watts, and costs about $11.00 from Mouser or Digikey. I realize the current heat sink will not be adequate for 100 watts, but it will suffice for the 5 and 50 watt calibrations of my K3, it does get warm to the touch. Only problem is resistance measures 51.2 ohms. What value of a parallel resistor would bring that down to 50 ohms? I calculate 1234.56 ohms or 1.2 K. Is that right? Also what would the power rating of the resistor need to be? Thanks.

Darryl, KK5IB



Re: Low Cost Dummy Load

davemrtn
 

I am not saying it isn't, but I have never heard 'Resistor Tolerance' related to standard deviations.

I am sure it's it used by the manufacturer to control their manufacturing process, but I think at lot of precision resistors (< 5% tolerance) manufactured these days use laser trimming to bring the parts to within rated tolerance.

Maybe there is an engineer in our group that works for a resistor mfg that can give us the full skinny ??


On 5/11/2015 6:12 PM, 'John R. Lonigro' jonigro@... [4sqrp] wrote:
 

I could be wrong, but I don't think a 1% resistor necessarily means the value is within +/- 1%.  I think there are some statistics involved which might say, for example, that the standard deviation is 1%, meaning there are about 40% of the resistors in a particular lot that would fall outside the 1% value and a few percent even falling outside the 2% value.

And, of course, David is right that the error (or at least some of the error) could be coming from the measuring device itself.  As they say, if you have one clock, you know what time it is.  If you have multiple clocks, you have no idea...

72,
John AA0VE


On 05/11/2015 02:20 PM, David Martin davemrtn@... [4sqrp] wrote:
 

Yes but, as you can see from his photo, he paid for a 1% resistor !!

For $11 (+ shipping), I would be calling the vendor.

OR MAYBE, the error is in the device he is using to measure the resistance ??


On 5/11/2015 2:05 PM, Wayne Dillon wayne.dillon@... [4sqrp] wrote:
 
Hi Darryl
Should be 2K2, this equates to 50.0355 Ohms total effective resistance. Not sure on power as the 51.2 is only about 3% of the 2K2. Anyway why worry about the error? the error is less that 3% and that's better than most commercial dummy loads.
Just my $0.02 worth.
Be blessed
Wayne - KC0PMH

On Mon, May 11, 2015 at 1:49 PM, kk5ib01@... [4sqrp] <4sqrp@...> wrote:
 

This is my new low cost dummy load, made with a Caddock thick film non-inductive resistor. This one is 50 ohms at 1%, and rated at 100 watts, and costs about $11.00 from Mouser or Digikey. I realize the current heat sink will not be adequate for 100 watts, but it will suffice for the 5 and 50 watt calibrations of my K3, it does get warm to the touch. Only problem is resistance measures 51.2 ohms. What value of a parallel resistor would bring that down to 50 ohms? I calculate 1234.56 ohms or 1.2 K. Is that right? Also what would the power rating of the resistor need to be? Thanks.

Darryl, KK5IB




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