Garey, Thanks for your answer. I think I will just use the linear on my other rig, which is a Yaesu FT 1000 MD V. Sincerely, Boyd
Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang ---------------------------------------------------------------------- Boyd - Probably not. The problem here is that the PiNet output circuit is designed to match the plate impedance of three tubes to ~50 ohms. By removing two tubes from the plate circuit, you are tripling the impedance of that side of the network. It's possible that it could handle that, but unlikely. The tank Q would be very high, and so extremely narrowband and with much higher losses. Safer than letting the plate caps "float" would be to reduce the screen voltage on the Final, but the matching problem would still exist. 73, Garey - K4OAH St. Charles, IL Boyd Van Horn wrote: > Garey, I know we need to leave all the finals in on a TR-4 because of > the series parallel filaments, but could one leave the plate caps off > one or two tubes to cut the power output instead of using a power > reducing network ? Boyd W0BUW > > */Garey Barrell /* wrote: > > > Garey Barrell made an utterance to the drakelist gang > ---------------------------------------------------------------------- > There is a set of N.O. contacts on Pins 5 and 8 of the Jones > connector > that close on transmit that can be used to ground the relay in the > Ameritron. They are rated at 2 A at 250 VAC so no problem handling > the > relay current. If you're using an AC-4 power supply, these > contacts are > wired to the two-pin connector on the side of the AC-4 marked VOX. > > The TR-4C expects a negative ALC voltage from the linear. If the > Ameritron provides this, it will work, but may require some sort of > level adjustment. The TR-4C has MUCH too much power output to > drive a 1 > kW linear. Aside from the fact that the amp is less than one-half > S-Unit increase in signal strength over the TR-4C, you will need some > sort of resistive pad between the two to keep from overdriving the > amp. The TR-4C will put out 200+ watts and the AMP will probably put > out 500. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B & C-Line Service Supplement CDs > > > > > Boyd Van Horn wrote: > > Could someone out there help me with the interface to use > between my > > TR4-C's and the Ameritron AL-811. The ameritron has its own > > Transmit/Receive relay which uses 12 VDC at a 100 ma when > grounded. Is > > there anyway to use the ALC circuit on the Amp with the Drake ? > Boyd > > W0BUW > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
