Question: what would the efficiency of a helical antenna be compared to a inverted L? 4 bamboo poles with a wire wound in a big helical let's say 20 feet across? Just a thought. De kd4wov Tom EL98 gr
Wow, where is the best place to get info on the D and E class amps? --Original Message-- From: [email protected] [mailto:[email protected]]On Behalf Of Dexter McInty
Wow, so you are able to use this class of amps in AM service? Do these amps require additional filtering for harmonics? de kd4wov I run voltage-mode class D amplifiers (400 watts) on 137 and 505 as w
Thank you, I will take a look. de kd4wov These articles have the information you need to design and tune a class E amplifier: http://www.arrl.org/tis/info/pdf/010102qex009.pdf http://www.cs.berkeley.
I would like a copy of the paper. De kd4wov tom --Original Message-- From: Chris Trayner Sender: [email protected] To: [email protected] ReplyTo: rsgb_lf_group@blacksheep.
Could these help in getting the efficiencies higher in LF amps? Granted, these are low power devices. Looks like they are on the right track. http://electronicdesign.com/article/power/Power-MOSFET-Kn
Thank you John. De KD4WOV Tom Sent via BlackBerry by AT&T From: John Gould <[email protected]> Sender: [email protected] Date: Sun, 27 May 2012 09:44:15 +0100 To: <rsgb_lf_g
Ok, I am looking at all the fun you all are having on LF. I have a few RXers that go down to 100 Kc, what do you all recommend for a receiver for 173 Kc or lower? I have seen many discussions about a
I don't comment much on this group. I enjoy listening and watching what is happening the world if LF radio. I do believe this group has been a huge force in keeping the LF radio art alive. Only thing
I am curious about the grounding systems people are using. Is anyone using multiple ground rods bonded together? Is anyone using a well that is drilled into the water table? Has anyone used sheets of
Yes, keeping the sparks from flying is one major concern i was having. I had a primary coil that resonated very well at 138 KHz, but I never finished making a secondary coil. Other than a Large globe
Hello, I have not experimented in a while with my partially built tesla coil, but has anyone used their Tesla coil as an antenna for ELF or other Freqs? If we try to use it for 137 KHz how do you det
Ahh I see, that must have been an awesome sight to behold. Did you get any pictures? One other note I just thought of. Here in the US displays for Tesla coils must be in a shielded an environment, i.
One other note I just thought of. Here in the US displays for Tesla coils must be in a shielded an environment, i.e. no radiation or EMI released from the shielded enclosure. not sure if that was the
Wow, now that is something I have not heard. I had a Jacob's Ladder set up that created some RFI even into the TV bands. I am amazed that you did not hear anything, but you could be right about the e
in the tube days you directly modulate the finals with actual audio power. For example you have a 100 watt TXer. you would need 50 watts of audio to modulate the 100 watt carrier to 100% modulation.
Must be the lack of solar activity. De kd4wov Tom Sent from my mighty AT&T BlackBerry Z10 smartphone. Original Message From: DK7FC Sent: Saturday, August 3, 2019 10:27 AM To: rsgb_lf_group@blacks
