xof7fox
| Joined: | Sat, Jul 7th 2012, 16:27 | Roles: | N/A | Moderates: | N/A |
Latest Topics
| Topic | Created | Posts | Views | Last Activity |
|---|---|---|---|---|
| If I am Tx'ing a VHF GrndWave of how much value is a Beam Antenna? | Jan 6th, 16:54 | 4 | 159 | on 14/1/14 |
| Impedance per current General Manual p.6-6/fig.6-5 ? | Nov 13th 2013, 16:48 | 1 | 117 | on 13/11/13 |
| Why is 72 Ohm Impedance center feed point desireable? | Oct 2nd 2013, 21:10 | 3 | 238 | on 3/10/13 |
| Impedance Matching HF | Aug 1st 2013, 22:18 | 3 | 417 | on 3/8/13 |
| Folded Dipole 40M | Aug 1st 2013, 22:04 | 3 | 420 | on 17/9/13 |
Latest Posts
| Topic | Author | Posted On |
|---|---|---|
| If I am Tx'ing a VHF GrndWave of how much value is a Beam Antenna? | xof7fox | on 14/1/14 |
| Thank you Zack. Thank you Martin. - Fred K4XXK. |
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| If I am Tx'ing a VHF GrndWave of how much value is a Beam Antenna? | xof7fox | on 6/1/14 |
| I am struggling to understand the value of a Beam Antenna for 2 Meters IF I am Transmitting an FM Vertically Polarized Groundwave. And, in advance, I thank you for taking the time to read this Post and, further, trying to advise me if you can. HERE IS MY QUESTION: Does a Beam/Directional help me push the FM Groundwave past the otherwise LOS limitation by some anticipate-able % greater amount? Meanwhile, with regard to all of the above I do understand that: 1. A Beam will help me Receive (this Q is exclusively about Transmitting). 2. If I am going after a bounce off of Meter/or 'equivalent' Scatter, or making it to a satellite or the space station then the Beam adds to my effective Transmit distance.(this Q is exclusively about Groundwave/LOS, not Skywave). MANY thanks, Fred k4xxk. |
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| Impedance per current General Manual p.6-6/fig.6-5 ? | xof7fox | on 13/11/13 |
| While in the current General/Level 2 Licensing Manual (7/1/11-6/30/15) on Page 4-18 "Impedance" is defined as: "...a general term for the opposition to current flow in an AC circuit caused by Resistance, Reactance or any combination of the two."... the Figure 6-5 (GLM0003) on Page 6-6 graphs Impedance over perfect ground per height of a Half-Wave Dipole in Wavelengths, yet it does not say, unless I am missing it, IF the Impedance is that of Resistance OR Reactance. Should the reader assume that the Impedance in Fig. 6-5 is purely Resistance (i.e., that Reactance is zero)? Many thanks in advance to anyone who can offer to me some guidance on this matter.... Fred K4XXK |
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| Why is 72 Ohm Impedance center feed point desireable? | xof7fox | on 3/10/13 |
| Thank you for your time, your thoughts and your guidance Zack. Am heading to Amazon for Antennas by Jack D. Kraus. |
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| Why is 72 Ohm Impedance center feed point desireable? | xof7fox | on 2/10/13 |
| Hello - I have read more than one ARRL article that report that the typical 40 M coax single wire center feed dipole in theoretical 'free space' can be expected to provide a 72-73 Ohm Impedance at the center feed point. My confusion has to do with wondering why I would want that if I should be matching the center feed point with the 50 Ohm Impedance signal coming at it from my Transceiver. In other words, if there were some other wire design/composition that would offer 50 Ohms at the center feed point would that not be more desireable? Thx, Fred K4XXK |
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