EME EXTRA-ORDINARY
2 Meter version.
or
Extra-ordinary modifications.

Start with a known configuration.
Scientific Radio Systems
SR-416P 1.5KW output.

The Story!
I spotted these on E-bay decided it was time to get back on 2 Meter EME.
My policy in radio is "Go BIG or stay home, since I knew this rig,
I waited and got them both. The E-bay auction photos.



These units' PA stage and power supply capability is based on the
W6PO 8877 2 Meter Amplifier.
Find the artical at: http://www.landfall.net/Radio/8877-1.htm


I got two of these, a really good deal.

Filling up the rear of the van!



The cabinets have dimensions as follows,
H=58.6 in., W=22.25 in. D=20.5 in.

That's two 5 plus foot racks and around 600-700 Lbs. EACH!
The power supply deck is around 350 Lbs by itself!!!!

Yes it was snowing when I went to get them!


The HV Power Supply and control deck,
this unit weighs approx. 300 Lbs by itself,
so you will definitely need help lifting it
up to the work bench, or a Lift Table!
SAFETY FIRST!



We will need an All-Mode exciter. With adjustable
drive level.

My IC-275H was brought into service again.



Then we can get to the modifications.
The Cleanup and check-out phase
starts with the main power supply chassis.




It needs to be checked out, restrapped for your A.C. mains, and tested for complete-ness.
Going to need a heavy duty line cord for the system.

The main circuit breaker was intermittent.
It is an AIRPAX APG6-7649-1 rated at
FL AMPS 30
MAX Volts 250
Hertz 50/60
Delay 62

Found a replacement and moved on.
Those faded red jobbies are:
large alligator clip covers.



Air exhaust vent on the PA deck.



The Amplifier chassis top cover is the "Air Exhaust chamber"



Air intakes for the Dayton Blower are the two
square holes with mesh covers.

The PA Multimeter does system monitoring.



And an Hour-Meter for the tube filaments.



Loads of control circuitry, everything is monitored!



The tuning is very precise.
Front cap.



Rear Cap tuning and blower.
Amplifier FWD/REFL Power sampler.



Of course the PA tube is also here.
EIMAC specs for the 8877 are here in PDF.

NOTE: The PA schematic is almost the same as the W6PO schematic.




Looking down through
one of the PA tuned lines.
At the bottom is the output line shorting bar.



Oh yes, this puppy is going to PLAY well!

Well the System has been cleaned,
tested and strapping checked for 115 VAC
operation, a few pictures of the semi-finished
project are in order.

The RACK, back together!



Nice!



A close-up for the Folks back home!



One more for those in the "Back"



Time for the Frequency Change to the PA, but first lets
check operation into a dummy load of the entire system!