Re: Topband: T-loaded vertical

ft >> vertical sections. >> >> Ed N1UR >> >> -Original Message- >> From: Richard (Rick) Karlquist [mailto:rich...@karlquist.com] Sent: >> Wednesday, February 19, 2020 3:04 PM >> To: Ed Sawyer; donov...@starpower.net; topband@contesting.com >

Re: Topband: T-loaded vertical

com] Sent: Wednesday, February 19, 2020 3:04 PM To: Ed Sawyer; donov...@starpower.net; topband@contesting.com Subject: Re: Topband: T-loaded vertical On 2/19/2020 11:50 AM, Ed Sawyer wrote: I have personally found that for Ts that are only 70 ft vertical, like mine, the ground losses of the lon

Re: Topband: T-loaded vertical

g.com Sent: Wednesday, February 19, 2020 7:50:13 PM Subject: RE: Topband: T-loaded vertical Frank, You will have me grabbing my EZNEC tonight and playing around. In my case my tops are around 60 ft long and they are thankfully perpendicular to my 20M yagi and about 120 ft away. However if I beam west

Re: Topband: T-loaded vertical

, 2020 3:04 PM To: Ed Sawyer; donov...@starpower.net; topband@contesting.com Subject: Re: Topband: T-loaded vertical On 2/19/2020 11:50 AM, Ed Sawyer wrote: > I have personally found that for Ts that are only 70 ft vertical, like mine, > the ground losses of the long to

Re: Topband: T-loaded vertical

On 2/19/2020 11:50 AM, Ed Sawyer wrote: I have personally found that for Ts that are only 70 ft vertical, like mine, the ground losses of the long topped L are not as desirable as the cancelled out horizontal lobes of the T. If the T were say 90 ft of vertical, I don’t think the T adds as

Re: Topband: T-loaded vertical

little affect on a 20 meter Yagi. Happy modelling! 73 Frank W3LPL - Original Message - From: "Ed Sawyer" To: donov...@starpower.net, topband@contesting.com Sent: Wednesday, February 19, 2020 7:50:13 PM Subject: RE: Topband: T-loaded vertical Frank, You wi

Re: Topband: T-loaded vertical

@contesting.com Subject: Re: Topband: T-loaded vertical Hi Ed, The affect of the T-vertical on a nearby HF Yagi is easily modeled in EZNEC or your favorite antenna modelling program. You'll be surprised by the results if the horizontal top is +/- 15% of resonance on 40 or 20 meters

Re: Topband: T-loaded vertical

performance -- an inverted-L is imperceptibly worse than a T-vertical. I no longer have any T-verticals... 73 Frank W3LPL - Original Message - From: "Ed Sawyer" To: topband@contesting.com Sent: Wednesday, February 19, 2020 6:13:02 PM Subject: Re: Topband: T-loade

Re: Topband: T-loaded vertical

The answer to the top loading is that the top is essentially the same as if it was an L on the antenna - just with the connection point moved to the center. I would add maybe 5 ft on either side of the top to that equation and see what it looks like when you install. And, like other verticals.

Topband: T-loaded vertical

>"With respect to current distribution with the lowered resonance -- N6BV modeled it in his NEC-4 licensed software, and found no increase in the far field compared to a resonant antenna." Looks like I accidentally cross-posted to the TowerTalk list, so I'll bring it back... Jim, I didn't see

Re: Topband: T-loaded vertical

On 2/18/2020 8:45 AM, N4ZR wrote: I keep seeing references to people using symmetrical wire top loading instead of the single wire of an inverted L.  My question is how to calculate the appropriate length for the two top-loading wires. At least 3 different answers: 1. If you want the

Re: Topband: T-loaded vertical

...@starpower.net Sent: Dienstag, 18. Februar 2020 19:01 To: topband reflector Subject: Re: Topband: T-loaded vertical Hi Pete, Symmetrical T-verticals offer a performance improvement over inverted-L verticals but with a major downside if you operate on the higher bands. If the flat top of the T

Re: Topband: T-loaded vertical

Yet another example of Frank coming up with excellent advice about things we hadn't thought of. At least I hadn't. Thanks Frank. 73, Jim K9YC On 2/18/2020 10:00 AM, donov...@starpower.net wrote: If the flat top of the T-vertical is near resonance on any HF band is will significantly degrade

Re: Topband: T-loaded vertical

hundreds of feet away. 73 Frank W3LPL - Original Message - From: "N4ZR" To: "topband reflector" Sent: Tuesday, February 18, 2020 4:45:27 PM Subject: Topband: T-loaded vertical I keep seeing references to people using symmetrical wire top loading instea

Re: Topband: T-loaded vertical

On 2/18/2020 8:45 AM, N4ZR wrote: My question is how to calculate the appropriate length for the two top-loading wires. An NEC model. It's a pretty simple one, and can be done in the free version that comes with the ARRL Antenna Book. 73, Jim K9YC _ Searchable Archives:

Topband: T-loaded vertical

I keep seeing references to people using symmetrical wire top loading instead of the single wire of an inverted L.  My question is how to calculate the appropriate length for the two top-loading wires. -- 73, Pete N4ZR Check out the Reverse Beacon Network at , now