[Premium-Rx] National HRO-600 help needed

[James C. Garland]

Hi Gang,
I;ve recently acquired a National HRO-600 VLF/HF receiver that I need to 
repair. First, since this is a seldom-seen receiver, I'll supply a few 
facts. The HRO-600 was the last receiver made by National, (in the 70's), 
and followed the HRO-500.  It sold for around $6K and was thus intended for 
government and military users. It covers 16 kHz-30MHz, with a motorized 
preselector that provides front-end selectivity. It has digital readout, 6 
selectivity settings, 3 AGC time constants, and receives SSB, CW, AM, with 
provisions for FSK.  It is built to mil-spec standards, with teflon wiring 
and very high grade printed circuit boards.  You can see a photo of it by 
Googling on HRO-600.

The problem with my radio lies in the first injection circuit, which is 
supposed to supply a (synthesized) 56-84 MHz signal in 1 MHz steps to the 
first mixer.  This circuit uses Motoral MC1000-series ICs, which are long 
discontinued. Unfortunately, I don't have the circuit diagram for the 
synthesizer (the manual only supplies the mainframe diagrams and not the 
board-level diagrams.)

So, realizing this is a long shot, here's what I'm looking for. First, if 
anybody has one of these receivers, I'd love to hear from you. And if you 
have the circuit diagrams of the circuit boards, I'll buy you dinner at a 
fancy restaurant.

If you don't have the diagrams, however, I'll settle for data sheets or 
specifications on the following Motorola ICs: MC1010P, MC1013P, MC1023P, 
MC1027P, MC1039P.  These chips were from an early Motorola MECL family. 
I've searched the web in vain for the pinouts and data sheets, without 
which I can't make a start on repairing this beast.

So any help or other info on this interesting radio would be most 
appreciated. Incidentally, my radio works fine in the VLF range (16 
kHz-1MHz) and hears like gang-busters.  (The synthesizer is only needed 
above 1 MHz.)

Thanks!

Jim Garland W8ZR