Re: FW: Azle ISD
Mike Burns, KE5NCS
Hi Paul. I attended the swap meet last year at the same location (church) where it will be held this year. There were plenty of tables and chairs available. Perhaps Daryl Pate can confirm this. Mike
On Wednesday, September 19, 2018, 3:16:00 PM CDT, AzleComm <AzleComm@...> wrote:
Please note the folding tables on the lower left. Do we need any for the Swapmeet or does the Church have plenty?
Paul
From: Azle Chamber of Commerce <promote@...>




FW: Azle ISD
AzleComm
Please note the folding tables on the lower left. Do we need any for the Swapmeet or does the Church have plenty?
Paul
From: Azle Chamber of Commerce <promote@...>
Sent: Wednesday, September 19, 2018 2:00 PM To: azlecomm@... Subject: Azle ISD




WC5CTech Net  Wed, 9/19/18
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WC5CTech Net  Wed, 9/19/18 7:30am8:30am
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WC5CTech Net  Wed, 9/19/18 7:30am8:30am
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Net Notes 9/13/2018
Jon, N5JLD
  Have fun, Jon N5JLD www.n5jld.net




Event: WC5CTech Net
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TCARC Weekly Net  Thu, 9/13/18 8:00pm8:30pm
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Net Control
Wayne Morris  AC5V
All – I have a class that just came up for tonight and tomorrow. I won’t be able to make the Tech net. Can one of you please take the net?
You can choose whatever you like for the question pool. We were on G0B04 if you want to continue from last week.
Thanks, Wayne




Re: Headphone Amplifier
Michael Heusser, kl7sg
toggle quoted messageShow quoted text
From: Bill Boyer
Sent: Monday, September 10, 2018 9:10 PM To: WC5C Subject: Re: [wc5c] Headphone Amplifier
Yes. The port on the back will only monitor one receiver, whichever one is selected by the menu item. However, this frees up the internal or external speaker for normal use, and does not require adjustment of the radio volume, in addition to the headphone amp volume. It also prevents some bozo from damaging the headphone amp by cranking up the radio volume. I chose this route because I assumed the A side of the radio was going to be used for APRS. We can always add another input for an HT or other radio if needed. External Data Band 1 Enter Menu mode and access Menu 918. 2 Set the data band to ABAND (A band receives and transmits), BBAND (B band receives and transmits), TX:ABAND RX:BBAND (A band transmits and B band receives), or RX:ABAND
On Mon, Sep 10, 2018 at 8:30 PM Michael Heusser, kl7sg <kl7sg@...> wrote:




Re: Headphone Amplifier
Bill Boyer
Yes. The port on the back will only monitor one receiver, whichever one is selected by the menu item. However, this frees up the internal or external speaker for normal use, and does not require adjustment of the radio volume, in addition to the headphone amp volume. It also prevents some bozo from damaging the headphone amp by cranking up the radio volume. I chose this route because I assumed the A side of the radio was going to be used for APRS. We can always add another input for an HT or other radio if needed. Here is the menu info  BBand is the right VFO: External Data Band 1 Enter Menu mode and access Menu 918. 2 Set the data band to ABAND (A band receives and transmits), BBAND (B band receives and transmits), TX:ABAND RX:BBAND (A band transmits and B band receives), or RX:ABAND
On Mon, Sep 10, 2018 at 8:30 PM Michael Heusser, kl7sg <kl7sg@...> wrote:




Re: Headphone Amplifier
Michael Heusser, kl7sg
Thanks Bill,
Will we be able to hear just one of the receivers?
Thanks,
Mike Kl7sg
Sent from Mail for Windows 10
From: Bill Boyer
Sent: Monday, September 10, 2018 12:23 PM To: WC5C Subject: [wc5c] Headphone Amplifier
Forgot to mention you need to change the external data port setting (menu 71, IIRC) to side B  so you will hear whatever is on the right side of the display. Otherwise you will hear the APRS.




Headphone Amplifier
Bill Boyer
Forgot to mention you need to change the external data port setting (menu 71, IIRC) to side B  so you will hear whatever is on the right side of the display. Otherwise you will hear the APRS.




Updated  Radio Output Minus Coax and VSWR Losses Plus Antenna Gain = ERP Calculator
Bob Ballard
Note the Excel file attached above. My thanks go to Mike Heusser (KL7SG) and Wayne Morris (KB5UQ) for their voluntary assistance with this project!
Those two guys not only suggested adding VSWR to the original Calculator worksheet I distributed earlier, they also provided the formulas needed to accomplish that mod. Mike and Wayne also clarified some of the nomenclature I originally used.
The calculator is also renamed as Radio Output Minus Coax and VSWR Losses Plus Antenna Gain = ERP Calculator.xlsx. That is a ridiculously long filename but it describes what the worksheet does.
73, Bob – KG5SQJ




New file uploaded to wc5c@groups.io
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Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the wc5c@groups.io group. File: WC5CMinutes20180804Redacted.pdf Uploaded By: Jay Cox Description: You can access this file at the URL: Cheers,




TriCounty ARC Meeting  Sat, 9/8/18 7:00pm8:00pm
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Re: Coax Attenuation Loss and Antenna Gain Calculator
Bob Ballard
Thank you Wayne and Mike for the mathematics and reference text clarifications. I’ll replace the use of the term “Power Factor” and replace it with something more explanatory and work on adding an SWR option.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Michael Heusser, kl7sg
Sent: Friday, September 7, 2018 10:01 AM To: wc5c@groups.io Subject: Re: [wc5c] Coax Attenuation Loss and Antenna Gain Calculator
Great answer.
You might consider briefly explaining the power factor as you have done here. Something like “actual antenna gain not in decibels”. Normally, in electronics, power factor is a number between 1 and +1, and it is related to the real power vs the apparent power (the phase difference between voltage and current).
I have attached a document concerning return loss by Steve Stearns, K6OIK. I think page 37 has the equations you need.
Thanks for taking the time to answer my questions.
Mike
Sent from Mail for Windows 10
From: Wayne Morris
Here is a formula for Excel for the mismatch loss where VSWR is the name of the cell containing the vswr value:
=10*(LOG10(1(((VSWR1)/(VSWR+1))^2)))
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Bob Ballard
The antenna’s gain is 3.5 dB / 10 = .35 which is then applied as the exponent of 10 (i.e., 10^{.35 }= 2.23872) which is the Power Factor. The Power Factor is multiplied times the watts getting to the antenna. After coax losses, the watts getting to the example antenna is 63.39 Watts. The 63.39 * 2.23872 = 141.9058 Watts Effective Radiated Power.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Michael Heusser, kl7sg
Hi Bob,
How do you define “ Antenna’s gain (@ Freq) power factor”? Also, have you accounted for the standing wave ratio?
Mike
Sent from Mail for Windows 10
From: Bob Ballard
Many online sites can be found to do these calculations but I built one for myself with Excel and decided to share it with any interested.




Re: Coax Attenuation Loss and Antenna Gain Calculator
Michael Heusser, kl7sg
Great answer.
You might consider briefly explaining the power factor as you have done here. Something like “actual antenna gain not in decibels”. Normally, in electronics, power factor is a number between 1 and +1, and it is related to the real power vs the apparent power (the phase difference between voltage and current).
I have attached a document concerning return loss by Steve Stearns, K6OIK. I think page 37 has the equations you need.
Thanks for taking the time to answer my questions.
Mike
Sent from Mail for Windows 10
From: Wayne Morris
Sent: Friday, September 7, 2018 9:36 AM To: wc5c@groups.io Subject: Re: [wc5c] Coax Attenuation Loss and Antenna Gain Calculator
Here is a formula for Excel for the mismatch loss where VSWR is the name of the cell containing the vswr value:
=10*(LOG10(1(((VSWR1)/(VSWR+1))^2)))
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Bob Ballard
The antenna’s gain is 3.5 dB / 10 = .35 which is then applied as the exponent of 10 (i.e., 10^{.35 }= 2.23872) which is the Power Factor. The Power Factor is multiplied times the watts getting to the antenna. After coax losses, the watts getting to the example antenna is 63.39 Watts. The 63.39 * 2.23872 = 141.9058 Watts Effective Radiated Power.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Michael Heusser, kl7sg
Hi Bob,
How do you define “ Antenna’s gain (@ Freq) power factor”? Also, have you accounted for the standing wave ratio?
Mike
Sent from Mail for Windows 10
From: Bob Ballard
Many online sites can be found to do these calculations but I built one for myself with Excel and decided to share it with any interested.




Re: Coax Attenuation Loss and Antenna Gain Calculator
Wayne Morris  AC5V
Here is a formula for Excel for the mismatch loss where VSWR is the name of the cell containing the vswr value:
=10*(LOG10(1(((VSWR1)/(VSWR+1))^2)))
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Bob Ballard
Sent: Thursday, September 6, 2018 8:35 PM To: wc5c@groups.io Subject: Re: [wc5c] Coax Attenuation Loss and Antenna Gain Calculator
The antenna’s gain is 3.5 dB / 10 = .35 which is then applied as the exponent of 10 (i.e., 10^{.35 }= 2.23872) which is the Power Factor. The Power Factor is multiplied times the watts getting to the antenna. After coax losses, the watts getting to the example antenna is 63.39 Watts. The 63.39 * 2.23872 = 141.9058 Watts Effective Radiated Power.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Michael Heusser, kl7sg
Hi Bob,
How do you define “ Antenna’s gain (@ Freq) power factor”? Also, have you accounted for the standing wave ratio?
Mike
Sent from Mail for Windows 10
From: Bob Ballard
Many online sites can be found to do these calculations but I built one for myself with Excel and decided to share it with any interested.




Re: Coax Attenuation Loss and Antenna Gain Calculator
Wayne Morris  AC5V
Source:
https://www.everythingrf.com/rfcalculators/vswrcalculator
r is the reflection coefficient RL is the return loss ML is the mismatch loss.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Bob Ballard
Sent: Thursday, September 6, 2018 8:35 PM To: wc5c@groups.io Subject: Re: [wc5c] Coax Attenuation Loss and Antenna Gain Calculator
The antenna’s gain is 3.5 dB / 10 = .35 which is then applied as the exponent of 10 (i.e., 10^{.35 }= 2.23872) which is the Power Factor. The Power Factor is multiplied times the watts getting to the antenna. After coax losses, the watts getting to the example antenna is 63.39 Watts. The 63.39 * 2.23872 = 141.9058 Watts Effective Radiated Power.
From: wc5c@groups.io <wc5c@groups.io> On Behalf Of Michael Heusser, kl7sg
Hi Bob,
How do you define “ Antenna’s gain (@ Freq) power factor”? Also, have you accounted for the standing wave ratio?
Mike
Sent from Mail for Windows 10
From: Bob Ballard
Many online sites can be found to do these calculations but I built one for myself with Excel and decided to share it with any interested.


