KE8DO
| Joined: | Sat, Apr 4th 1998, 00:00 | Total Topics: | 0 | Roles: | N/A |
| Last Login: | Never | Total Posts: | 0 | Moderates: | N/A |
Latest Posts
| Topic | Author | Posted On |
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| Lighting Protection | Jartoc | on 13/1/12 |
| Can you give more details? What band are you using, HF, VHF or UHF? How is your antenna mounted for base station use? The bigger and higher that your antenna is, the more inportant a good ground system and lighting surpression is. In your case, it may be just easier to disconnect the radio when it is not in use. For your best signal, it would be better for you to also have a base station antenna. 73 Don KE8DO |
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| Butternut HF6V Vertical antenna how much far from a fence? | vassile52 | on 10/1/12 |
| Can you mount the antenna on top of the fence and use the fence as part of the ground system? Otherwise I would keep it as far away as you can, but more important, keep it away from your house and overhead wires. No antenna system is perfect, you just have to do the best with what you have to work with. 73 Don KE8DO |
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| antenna coax hook-up question | K4PHI | on 3/12/11 |
| You did not say what bands the beams are for or the type of beam. You may get away with just using a T connector and 1 coax. It is best to use a balun if the beam uses a balanced feed system, so if a balun was used before then I would use one again, or at least roll up some coax to make a choke. It is best to run a coax cable from each antenna to an antenna switch in the shack, or you could use a remote switch at the top of the tower. 73 Don KE8DO |
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| The "JUNKER" AMP | N8CHR | on 1/11/11 |
| I have not read the QST article but I will comment anyway. I remember the big heavy transformers that the big old black and white TV's had from back in the 1960s. My dad worked for a Philco TV dealer and he would bring home junk TVs for me that they had taken in on trade. They had a center tapped winding for a full wave tube type rectifier for a B+ of about 350V or maybe more, if my memory is correct. You could use the same winding to get about 1500 V or more using a voltage doubler circuit and solid state rectifiers. I never did build a homebrew amplifier, but I did built a SB-220 from a kit, and I did use a used TV transformer to build a power supply for my HW-100 and HW-32. It may be very hard to find one of the old tube type TVs today. Be careful working with the HV. Let us know how it turns out. 73 and good luck - Don KE8DO |
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| Mounting HF Vertical to leg of tower | N8CHR | on 14/10/11 |
| Hello Tom Can you give more information about your tower and antenna? What is the model of the antenna? How high is your tower? What antennas do you already have on it? How high to you plan to side mount the vertical? The tower can take the place of having radials or you could still use the radials. The tower is going to have a big effect on the antenna matching and pattern. I would try and get it as far from the tower as you can. You could use a computer antenna modeling program to see what the effects would be. You may be better off just mounting it on your roof and putting down the radials on your roof or just above it, as I did at my last house. That way the matching and pattern would still be more like you have now. 73 Don KE8DO |
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