** That there is no reason to switch to not-linear bias during a spoken word. I can spot RF-actuated EBS on the air by the rough sound and increased splatter. - There is no reason to ever switch the
RF, ** With no input RF, there is always zero RF circulating current, no matter what type of bias switch is used. -- . When SSB RF drive drops below the EB-switch threshold level during soft-syllabl
Amen, Phil. For 24A (2A x Q=12) of circulating current at 10m, 3/8" Cu tubing is not too large. Rich, AG6K, 805-386-3734, www.somis.org / new e-mail adr r@somis.org
The fly in the ointment is that the AL-1500 tank L gets mucho hot with one 8877. With two tubes and 2x the I-anode, figure c. 4-times as much tank loss. _ A tetrode with handles is a practical solut
** The best place for a high-power amplifier is in front of the vehicle's radiator with short leads to the battery. Rich, AG6K, 805-386-3734, www.somis.org / new e-mail adr r@somis.org
** To find out for yourself, place a black cast-iron frypan and an aluminum frypan side by side in the sun, Wait 10 minutes and touch each. The material that aborbs and gives up radiant heat the bes
? Do you need to go faster than 35wpm? If you do, delete this reply. ? the circuit at Figure 7 on my web site is fairly simple. The cost is c. $60. . However, the SB-200's neg. 110vdc supply needs t
** I would check the input reed-relay first off. If it's bad, the Matsushita RSD RF reed relay is an upgrade since it has Rh-Au contacts. In single-lots, these relays cost $11 ea. Rich, AG6K, 805-38
** Why not buy a tetrode with handles from Svetlana, build an ugly amplifier, and obtain 6x more P with half the drive? Rich, AG6K, 805-386-3734, www.somis.org / new e-mail adr r@somis.org
** Removing plates from the original tune-C would work. ** Converting a parallel circuit to an equivalent series circuit (admittance to/from impedance) is not a piece of cake. For an explanation see
** Yakking about current events on SSB is more fluid than doing such via finger-talking. Rich, AG6K, 805-386-3734, www.somis.org / e-mail adr r@somis.org
** ... an operator who thinks (?) 5w is excessive power on 75m during the summer. It seems as though the weaker they are, the longer they talk. cheerz, Pat Rich, AG6K, 805-386-3734, www.somis.org /
** due to the slight play in the gears of the ordinary RAD, it is more suiteable for driving vacuum variable capacitors because it less sensitive to shaft misalignment binding.. Rich, AG6K, 805-386-
** the last time I bought right-angle drives I bought them direct from Cardwell Condensor. The price was quite reasonable. Rich, AG6K, 805-386-3734, www.somis.org / e-mail adr r@somis.org
** a blown grid resistor should not damage the tube or the meter because if the resistor blew, current flow from the cathode would stop. Rich, AG6K, 805-386-3734, www.somis.org / e-mail adr r@somis.
** When operating QSK-CW, I turn down the RF gain control to minimize background noise and interruption by QRPP berserkos. ** good point, Vic. However, CW is about 230-wpm slower than voice. Rich, A
** QSK-CW is even rarer these days than traditional CW. For me. the reason to use high-speed switching is SSB-VOX. Those who talk continously for 10-minutes are something to be avoided at all cost.
** how could it be not necessary to isolate the transceiver from the antenna jack on the Amp? I would like to see a diagram. Rich, AG6K, 805-386-3734, www.vcnet.com/measures