Re: LF: Re: GB4FPR 502 KHZ INTERNATIONAL MARCONI DAY 30/4/2011

[Gary - G4WGT <g4wgt@tiscali.co.uk>]

Hi Dennis,

Alan G3NYK has an ERP spreadsheet calculator which should be a good estimate & make the calculations easier. Calculators at the bottom of the page & you will find the page here :-

http://www.alan.melia.btinternet.co.uk/programs.htm#Programs

73

Gary - G4WGT.

On 1 May 2011 09:49, DENNIS EASTERLING <dennis.easterling@btinternet.com> wrote:

Hi Luis

 

In answer to your question, I calculated using the following web site:

www.smeter.net/antennas/simple-t-antennas.php and then followed the link to TAntenna which provided a simple Basic program tantenna.exe by A.J.Edwards G4GGQ.   Probably the easiest way is to use a google search for T Antennas and follow the links.

 

The outcome is probably inexact as my antenna is really of the unbrella type with the tops sloping down, however when I converted from true 'T' to the present setup, no difference was noticed or reported.   See attached sketch.

 

73 Dennis M0JXM

----- Original Message -----

From: Luis EA3WX

To: rsgb_lf_group@blacksheep.org

Sent: Saturday, April 30, 2011 7:32 PM

Subject: Re: LF: Re: GB4FPR 502 KHZ INTERNATIONAL MARCONI DAY 30/4/2011

Hi Dennis,

 

A question, please. I am beaconing on 502,25 KHz. My transmitter puts 35 W into a T antenna, high 20 m and an horizontal capacitor top of 10 m.

 

With others ham fellows we are discussing what ERP I am sending, but we have no results. Can you tell me how measure or are you calculating or estimating this ERP?

 

Thanks, 73

 

Luis, EA3WX

 

From: DENNIS EASTERLING

Sent: Saturday, April 30, 2011 8:55 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Re: GB4FPR 502 KHZ INTERNATIONAL MARCONI DAY 30/4/2011

 

Hi Graham

 

I tried sending to you 1630-1635 and 1940-1945 local times today Saturday 30 04 2011, but no reply.   I guess you could not hear me, or I you.   I send CW 25watts into a 'T' aerial 20m top and 10m vertical.   Estimated erp 250mW max.   Anyway, I hope you had a good day with plenty of DX.

 

73 Dennis M0JXM