Garey Barrell <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>/* 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
----------------------------------------------------------------------
