Date   

Re: Parallel Resistance calculator

Brian Crittendon
 

Try these sites.
allaboutcircuits.com
calculator.net


Re: Parallel Resistance calculator

WA0ITP
 

Thanks Pete.  I had one once.  Think I picked it up at a hamfest back in the 60's. It was very useful.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 6/21/2018 5:09 PM, KB5HRS via Groups.Io wrote:

Radio Shack carried one. It was a plastic, slide rule type.  I still have one.  Catalog number
was 272-1211. Hope this is helpful.

72, de Pete KB5HRS


Re: Parallel Resistance calculator

KB5HRS@...
 

Radio Shack carried one. It was a plastic, slide rule type.  I still have one.  Catalog number
was 272-1211. Hope this is helpful.

72, de Pete KB5HRS


Re: Parallel Resistance calculator

WA0ITP
 

Thank you John, I'd forgotten that calculation.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 6/20/2018 3:47 PM, John T. Fitzer wrote:

You don’t need a specific calculator, Just keep in mind that for parallel values of resistors the equivalent resistance will always be lower than the lowest value of any one resistor in the parallel combination. The easiest way to calculate the needed value of a parallel resistor combination is to convert all values of resistance into conductance. The value of any resistance in mho is equal to 1/R where R is resistance in ohms. As an example let’s say you have an 81 ohm resistor and you want to parallel that with some value to get 50 ohms. 1/50=0.02 – 1/81=0.012345679=0.007654321 mho of additional conductance required =1/0.007654321 ohms =130.6451613 ohms. Nearest standard value = 130 ohm 5%. If you want to find the parallel resistance of 2 or more resistance, simply convert each resistance to conductance, add them all together then convert back to ohms by taking the reciprocal of the total conductance, i.e. R total = 1/ 1/R1+1/R2+1/R3 etc. Example the parallel combination of a 100 ohm, 150 ohm, & 180 ohm resistors in parallel = 1/100 = 0.01 + 1/150 =0.006666667 + 1/180 = 0.005555556 =0.022222222 mho = 1/0.022222222 = 45 ohm. I hope this helps

 

From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Jeff Collins
Sent: Wednesday, June 20, 2018 3:11 PM
To: main@4SQRP.groups.io; 4sqrpio
Subject: Re: [4SQRP] Parallel Resistance calculator

 

Dear WA0ITP,

    Try this: https://gock.net/resistor/

    Or this: parallel resistor calculator reverse

Thank you,
 
Jeffrey R. Collins - W7GRV
FCC(SW) USN, Ret.
BS, EMT-P, FF I/II
Training Oficer -
Birch Tree Volunteer Fire and Rescue
Member of Missouri Region G HazMat Team

On 6/20/2018 2:45 PM, WA0ITP wrote:

A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculator.  Matching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.

-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com

 



Re: Parallel Resistance calculator

WA0ITP
 

works great, tnx Jeff
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 6/20/2018 3:10 PM, Jeff Collins wrote:

Dear WA0ITP,

    Try this: https://gock.net/resistor/

    Or this: parallel resistor calculator reverse

Thank you,

Jeffrey R. Collins - W7GRV
FCC(SW) USN, Ret.
BS, EMT-P, FF I/II
Training Oficer -
Birch Tree Volunteer Fire and Rescue
Member of Missouri Region G HazMat Team
On 6/20/2018 2:45 PM, WA0ITP wrote:
A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculator.  Matching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.
-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com



Re: 40m Net

Lloyd K3ESE
 

Yes, I was hoping that some of the stations I was copying loudly would mention that I was out there...

K3ESE

On Thu, Jun 21, 2018 at 2:09 PM, dekle <dekle@...> wrote:

A reminder:
 
If you hear someone that I don't hear or someone that I am having real trouble copying, wait for a clear spot and send "BK" and offer to QSP. That would be a great help.
 
73
Bill
KV6Z
 
 
----- Original Message -----
Sent: Thursday, June 21, 2018 8:08 AM
Subject: Re: [4SQRP] 40m Net

I was in there trying. Bill was about 549.

K3ESE

On Wed, Jun 20, 2018, 10:13 PM dekle <dekle@...> wrote:
Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


Virus-free. www.avast.com



QRP items for sale

Thomas Martin
 

I am terminally ill and my condition has gotten worse and would like to find a good home for the following items 

1:01 PM (2 minutes ago)
KX 2 serial number 1672 has ATU, Lipo battery pac and charger hand mike, Travel bag. I also have an KX3 Helper by w1sfr which is an end fed 35 ft with 9:1 un un also a 12 volt 7 amph battery with solar charger attached as well as AC charger. This a a commercial unit.
I would like 950.00 for the package and will split shipping. 
Will break up if needed. 

An HF-VHF 3mhz-174 mhz base loaded antenna with variable radiator has plug in for various bands. have chart for use.
Asking 45.00 will split shipping

MFJ 2220 Dipole kit for 20 meters  asking 25.00 will split shipping

Caras HF magnetic loop antenna 3-15 mhz this is brand new never had a chance to try out. 
asking 70.00 will split shipping. 
Contact k0amd at arrl. dot net


Re: 40m Net

dekle <dekle@...>
 


A reminder:
 
If you hear someone that I don't hear or someone that I am having real trouble copying, wait for a clear spot and send "BK" and offer to QSP. That would be a great help.
 
73
Bill
KV6Z
 
 
----- Original Message -----
Sent: Thursday, June 21, 2018 8:08 AM
Subject: Re: [4SQRP] 40m Net

I was in there trying. Bill was about 549.

K3ESE

On Wed, Jun 20, 2018, 10:13 PM dekle <dekle@...> wrote:
Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


Virus-free. www.avast.com


Re: 40m Net

Lloyd K3ESE
 

I was in there trying. Bill was about 549.

K3ESE

On Wed, Jun 20, 2018, 10:13 PM dekle <dekle@...> wrote:
Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


Re: Parallel Resistance calculator

Don, W9EBK
 

WA0ITP,
OK, you have me stumped! I remember that resistance calculator exactly as you describe it. I recall seeing it in the past 6 months or so. I have done a search of my Gmail account back to 2007 with all the search terms I can think of and come up with nothing. Now I'm on a mission. This weekend I will try searching my other email and archives to see if I can find it.
Don, W9EBK

On Wed, Jun 20, 2018 at 2:45 PM, WA0ITP <wa0itp@...> wrote:
A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculatorMatching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.
-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com



Re: Parallel Resistance calculator

John T. Fitzer
 

 

 

From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of John T. Fitzer
Sent: Thursday, June 21, 2018 8:19 AM
To: main@4SQRP.groups.io; kennick@...
Subject: Re: [4SQRP] Parallel Resistance calculator

 

Regarding the dummy load idea, Back in the days when I was running QRO (100) watts, I made a dummy load by immersing 20 1Kohm 2 watt carbon resistors in a quart of mineral oil with a SO239 mounted to the top of the can lid. From a practical point of view, and without getting too deep into thermodynamics it is safe to assume that as a rule of thumb, any resistor immersed in oil will increase its dissipation capabilities by a factor of 4. So theoretically my red neck dummy load should be able to handle 160 watts. I never tested it at that power level, but as I remember it never even got warm at 100 watts. Keep in mind I never held the key down for more the a minute or so. I was more concerned about killing the 6146’s.  

 

From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Howard Weinstein
Sent: Wednesday, June 20, 2018 8:23 PM
To: main@4SQRP.groups.io; kennick@...
Subject: Re: [4SQRP] Parallel Resistance calculator

 

Or you could immerse them in oil and make a unique dummy load

"Quis custodiet ipsos custodes?”


On Jun 20, 2018, at 20:45, Nick Kennedy <kennnick@...> wrote:

This reminds me of an article in QST in July 1963 called "Euclid and a quart of resistors". It showed how to take a quantity of resistors of a single value (say you have a quart of 47 ohm, 1% resistors ...) and combine them to produce any value, exactly.

 

I guess I'm regressing to my youth because I looked up that 55 year old article and ran though a couple examples to see that it worked. I don't think it really has much practical value - it's just an interesting demonstration of a technique.

 

73-

 

Nick, WA5BDU

 

On Wed, Jun 20, 2018 at 2:45 PM WA0ITP <wa0itp@...> wrote:

A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculator.  Matching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.

-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com


Re: Parallel Resistance calculator

John T. Fitzer
 

Regarding the dummy load idea, Back in the days when I was running QRO (100) watts, I made a dummy load by immersing 20 1Kohm 2 watt carbon resistors in a quart of mineral oil with a SO239 mounted to the top of the can lid. From a practical point of view, and without getting too deep into thermodynamics it is safe to assume that as a rule of thumb, any resistor immersed in oil will increase its dissipation capabilities by a factor of 4. So theoretically my red neck dummy load should be able to handle 160 watts. I never tested it at that power level, but as I remember it never even got warm at 100 watts. Keep in mind I never held the key down for more the a minute or so. I was more concerned about killing the 6146’s.  

 

From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Howard Weinstein
Sent: Wednesday, June 20, 2018 8:23 PM
To: main@4SQRP.groups.io; kennick@...
Subject: Re: [4SQRP] Parallel Resistance calculator

 

Or you could immerse them in oil and make a unique dummy load

"Quis custodiet ipsos custodes?”


On Jun 20, 2018, at 20:45, Nick Kennedy <kennnick@...> wrote:

This reminds me of an article in QST in July 1963 called "Euclid and a quart of resistors". It showed how to take a quantity of resistors of a single value (say you have a quart of 47 ohm, 1% resistors ...) and combine them to produce any value, exactly.

 

I guess I'm regressing to my youth because I looked up that 55 year old article and ran though a couple examples to see that it worked. I don't think it really has much practical value - it's just an interesting demonstration of a technique.

 

73-

 

Nick, WA5BDU

 

On Wed, Jun 20, 2018 at 2:45 PM WA0ITP <wa0itp@...> wrote:

A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculator.  Matching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.

-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com


Re: 40m Net

Mike D
 

I was traveling this week but tried from my hotel balcony in Toronto with no luck.  Will be back in Tulsa next week.

73 de KD5RJZ/VE3

On Wed, Jun 20, 2018, 9:20 PM Ruth A Mumaw <k3nlt@...> wrote:

I was there, but very rough copy. Your report was 339 with QSB and QRN. I will be on next week again, then back to alternate weeks. Radio K2 at 5 watts.   Russ



On June 20, 2018, at 10:13 PM, dekle <dekle@...> wrote:


Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


Re: 80 meter net

Johnny AC0BQ
 

Hello Gary
I understand.
We have boomers moving in tonight.
We’re just hoping for some rain!!
72
Take care 
Johnny AC0BQ 

On Wed, Jun 20, 2018 at 9:45 PM gary Lyons <gary.w0gx@...> wrote:
Johnny & gang,

I tried but a no go tonite. Strong thunderstorm over the county next to with impressive lightning displays. I left my antenna unhooked. Maybe next week. (Fingers crossed)

73,
Gary/w0gx

On Wed, Jun 20, 2018, 9:53 PM Johnny Matlock <jomatlock@...> wrote:
Well 
80 meters was a little thin and a lot noisy, static crashes were strong.

Checking in were:
KK5IB in AR
N0EVH portable
And 
KV6Z from OK.
Thanks guys 
Cu next week 
72
Johnny AC0BQ 
--
Check out the 4SQRP website at 4sqrp.com

--
Check out the 4SQRP website at 4sqrp.com


Re: 80 meter net

gary Lyons
 

Johnny & gang,

I tried but a no go tonite. Strong thunderstorm over the county next to with impressive lightning displays. I left my antenna unhooked. Maybe next week. (Fingers crossed)

73,
Gary/w0gx


On Wed, Jun 20, 2018, 9:53 PM Johnny Matlock <jomatlock@...> wrote:
Well 
80 meters was a little thin and a lot noisy, static crashes were strong.

Checking in were:
KK5IB in AR
N0EVH portable
And 
KV6Z from OK.
Thanks guys 
Cu next week 
72
Johnny AC0BQ 
--
Check out the 4SQRP website at 4sqrp.com


Re: 40m Net

Ruth A Mumaw
 

I was there, but very rough copy. Your report was 339 with QSB and QRN. I will be on next week again, then back to alternate weeks. Radio K2 at 5 watts.   Russ



On June 20, 2018, at 10:13 PM, dekle <dekle@...> wrote:


Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


40m Net

dekle <dekle@...>
 

Not too bad tonight.
QNIs were:

W7KFI        Susan     MS
N0XM         Mike        KS
KA8ONW   Mark        MI
WA9PWP   Paul        WI
AC0BQ      Johnny    KS

I also think I got K3NLT - Russ in VA  - but the SSB QRM came up so bad that I'm not 100% positive.
I got the K3 part clearly but every time he sent the rest of his call the SSB ducks started quacking.
The KS stations were the loudest ones tonight.

Thanks all for trying.
See you next week.

73
Bill
KV6Z


80 meter net

Johnny AC0BQ
 

Well 
80 meters was a little thin and a lot noisy, static crashes were strong.

Checking in were:
KK5IB in AR
N0EVH portable
And 
KV6Z from OK.
Thanks guys 
Cu next week 
72
Johnny AC0BQ 
--
Check out the 4SQRP website at 4sqrp.com


Re: Parallel Resistance calculator

Howard Weinstein <wa3mck@...>
 

Or you could immerse them in oil and make a unique dummy load

"Quis custodiet ipsos custodes?”

On Jun 20, 2018, at 20:45, Nick Kennedy <kennnick@...> wrote:

This reminds me of an article in QST in July 1963 called "Euclid and a quart of resistors". It showed how to take a quantity of resistors of a single value (say you have a quart of 47 ohm, 1% resistors ...) and combine them to produce any value, exactly.

I guess I'm regressing to my youth because I looked up that 55 year old article and ran though a couple examples to see that it worked. I don't think it really has much practical value - it's just an interesting demonstration of a technique.

73-

Nick, WA5BDU

On Wed, Jun 20, 2018 at 2:45 PM WA0ITP <wa0itp@...> wrote:
A while back someone  posted, on some list, a link to a calculator that provided abt 15 or so parallel resistor combination which matched a desired value that was entered into the calculatorMatching parallel values were tabulated as were error deviations in percent. Alas I lost the email with the link.

Google is not my friend on this.  Did anyone here see and save that email/link?  Thanks for checking, appreciate it.
-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com


Wednesday Evening 40 and 80 meter Nets - Wed, 6/20/18 #cal-notice

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

Wednesday Evening 40 and 80 meter Nets

When:
Wednesday, 20 June 2018
8:00pm to 9:00pm
(GMT-05:00) America/Chicago

Where:
40 and 80 Meters

Description:
The 40 Meter Net will be at 8:00 pm central or 0100 UTC on 7.122 +-.
NCS will be Bill KV6Z.

Wednesday evening 80 Meter CW Net. will be at 0130 UTC Thursday (8:30PM Central Time Wednesday). 
The net will be called on 3.564 MHz +/- QRM.



Net control operators are Johnny AC0BQ or Paul N0NBD.

6561 - 6580 of 23922