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Additional Info on ECO-4, new feeder, Shivley 6813

Posted: Fri Jun 29, 2018 8:33 am
by abwdvm
1. Licensed ERP of 3600? Effective Radiated Power 3600 Watts
Polarization: Horizontal Vertical
Effective Radiated Power (ERP): 3.6 3.6 kW ERP

2. How many antenna bays? Can you tell who made them? (shot a picture) 4 bays, 2 section, Shivley 6813

https://www.shively.com/product/6813/

3. How many feet of coax from the base of the tower to where it goes into the antenna? 280

4. How many feet of coax from the base of the tower into the shack and to the transmitter? 15
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Re: Additional Info on ECO-4, new feeder, Shivley 6813

Posted: Fri Jun 29, 2018 8:44 am
by TPT
OK, your required TPO--using the Shively 4 bay antenna and the 1 5/8th foam line--is 1,980 watts.

Is this the new site or the existing site? If it is the existing site, for the 3" line--the TPO (surprisingly!) is 1,900 watts. Since the foam line is rated for 8 kw, there really isn't much point to use a larger line at the new installation.

I used the calculator from RF Specialties, and used Andrew Heliax for the 3" calculations.

I'm send a PM

Re: Additional Info on ECO-4, new feeder, Shivley 6813

Posted: Fri Jun 29, 2018 8:47 am
by abwdvm
All images are of the old site, 3 1/8 feeder. Heading out right now to remove the transmitter.

Re: Additional Info on ECO-4, new feeder, Shivley 6813

Posted: Fri Jun 29, 2018 9:09 am
by Nathaniel Steele
You still didn't specify if the bays are full wave spaced or half wave spaced, which will affect the TPO. Howver, if that TX is operating properly, you will still have plenty of transmitter power.

Re: Additional Info on ECO-4, new feeder, Shivley 6813

Posted: Fri Jun 29, 2018 10:34 am
by abwdvm
I'll try to find that out asap