>  You have no idea how close this (and the other) manuals 
> came to being
> landfill.  Was at one of the flea markets in S.A. and a guy 
> was getting 
> ready to leave and didn't want to haul a bunch of stuff back. 
 
  Wowsers! :-)
 
> One of the things I didn't get was what appeared to be a VHF-LO 
> mobile.  At the
> time just couldn't justify the space. :/  Was a Midland I 
> think, huge
> son of a gun too.
 
  Makes one wonder how many "boat anchors" there are buried in the landfills 
that could be _really_ neat to play with. (long sigh)
 
>  Does it have a listed reciever cert. number?  RL14A is 
> 29-35, B is 35-44,
> and C is 44-50.
 
  No, it doesn't, but I'm quite certain it'd be a "C", since it was spec'd 
for 47.42 use.
 
> RBK> says 500-943C on the solder pad, and the transmit board 
> is a 1974 
>           ^^^^^^^^
>  That's good.  The L.O. uses a third overtone xtal fed to a 
> tuned circuit
> on gate 1 of a dual gate MOSfet.  (Q101)  The fet is also 
> the first transistor
> after the input filter from the ant. connection.  The fet 
> puts out the
> 10.7Mhz 1st. I.F. which is sent to the 10.245Mhz 2nd I.F.
 
  Okay, I'm following most of this, so far.. (I recall that MOSFETs can be 
_very_ fussy at times)
 
> A couple of things here, the input bandpass filter is *only* 
> 1Mhz wide.  
> Depending on what part values were used will determine what 
> what band 
> it was used on. That being said however, based on the 
> alternate part values
> given, you should be able to widen it up for all of 6M.
 
  Good, good..
 
>  Second, is that the 2nd gate has *NO* protection other than 
> the caps in the
> filter between it and the antenna, a 22K resistor to ground, 
> and after a
> 100K, 680ê, and a 68ê resistor to the unreg. 13.8VDC source.
 
  Eiewww, not good at all...
 
>  I'd suggest either replacing it with one that has some 
> overvoltage
> protection built-in and/or adding some diodes to shunt any 
> high voltages
> away from it.  (me, I'd do both just in case)
 
  This is still Q101, the dual-gate MOSFET? Or are these two seperate 
devices? Only ones I can seem to locate like this are two -202 case devices 
on the back of the receive board, heat-sinked to the back of the chassis, 
next to the antenna socket..
 
> The other is that in situations where there was strong image 
> interference,
> the 2nd I.F. was 11.155Mhz. (IC101) The xtal used will be 
> marked as to which.
 
  Can't tell, looks like it's soldered in place. (sigh)
 
> RBK>number 501-183C.
>            ^^^^^^^^^
> That's not *too* bad.  The biggest changes were the drop to 
> 6 xtals,
> and the power regulater being moved to it.  Anything done 
> after 12/75 when
> they revised the relay board (501-265) your own your own. 
> 
 
  Hehe.. can't tell which relay board I have, either, but I hope it's the 
older one! :-)
 
> A couple of things here, the xmtr is never powered up until 
> you key the
> mic.  At that point the rcvr is powered down.  What makes 
> this interesting
> is that you could use it as a repeater and not need to 
> supply power to the 
> xmtr until it was actually needed by just changing the relay 
> hookup.
> This is good if you had to run it off of a battery powered 
> backup. No 
> standby current lost to the xmtr.
 
  Oh, really?!?!?! I kind of wondered about this, when I realized that it did 
have seperate xmit and rec PCBs on it. Wow! I _have_ been dinking around with 
the idea of my own 6m repeater, and this littl' jewel could be the heart of 
it!!
 
>  Another is that from what I get out of the reading is the 
> swr protection
> instead of shuting the finals off entirely, just reduces the 
> power down
> as the swr goes up.  The advantage here is that you at least 
> keep putting
> out a signal, which is handy in an emergency setting where 
> you don't have
> an optimum antenna setup.   (I know you know all this, but 
> this is for those
> who haven't quite gotten some of the *trick's of the trade* 
> as it were down
> just yet)
 
  I'm a _little_ familiar with the autoprotect circuitry, it's a wise thing 
to have, rather than just "crowbar" it off. :-(
 
>  Now for the really fun part.  :>
 
  Yup, in the next message!
 
                                                        _Ray_
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