I have just about everything one needs to complete a solid state amplifier
based on the EB104 design. This is a 600 W amplifier design based around
four MRF150 power MOSFETs in a push-pull configuration.
Here is what I have:
Two RF power amplifier boards, each with a pair of MRF150 transistors and
two pairs of lower power MOSFETs. Each board is fastened to a large 12 x
8.5 in heat sink with BNC connectors.
Chassis and cabinet from a TS-180S transceiver (12.5 x 11 x 5 in).
Two switching power supplies to choose. One is a Delta NC585 48 VDC rated
at 20 A on 120 VAC and 35 A on 220 VAC. It is very compact and one could
probably take the boards out and mount them directly into the cabinet. The
rear blade contacts are 48 VDC but the fans are 12VDC so relays etc. can be
powered by splicing into the leads. Two pins are shorted together in order
to activate the secondary output.
The second is a Sony APS-162 switching power supply. It is rated for 42 VDC
(adjustable to about 52 VDC) at 27.5 A. It also has rear outputs for
3.3V/15A, 5V/5A and 12V/6A. It will accept 220 or 120 V inputs.
Both supplies are for commercial telecom applications and are well filtered
for EMI so I could not detect any RF "hash." Both have been bench tested
and produced steady output with a 7 A load (all the load resistors I have).
They also both have feedback logic inputs to the PWM. If you know how to
use this then these units will show very little voltage drop (although THP
and Ameritron don't even use regulated supplies in their versions so you
don't need it).
I have one AC power cord that will go with the first supply that sells.
Price: Components + Delta supply for $150 shipped
Components + Sony supply for $200 shipped.
I also have an MFJ-961 legal limit tuner that I will ship for $150 (cleaning
house before I move)
Email me directly and I'll send some pictures.
Thanks,
Anthony
NR9R
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