Hi Ray Brown Kb0stn, hope you are having a nice day
PW>  You have no idea how close this (and the other) manuals came to being
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PW> ready to leave and didn't want to haul a bunch of stuff back. 
RBK>   Wowsers! :-)
 Yep.  Happens that way sometimes.  I've seen some ford coax assembleys
that I wish I knew more about.  Two pieces of coax (look to be about the
size of mini-8) with the jackets `zip' corded together one  with bnc conn.
at each end and the other with tnc.  Wish they had numbers I could reference
They'd be nice for 2-440 on one and 23cm on the other.
 
PW> One of the things I didn't get was what appeared to be a VHF-LO 
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PW>son of a gun too.
RBK>  Makes one wonder how many "boat anchors" there are buried in the 
RBK> landfills that could be _really_ neat to play with. (long sigh)
 I bought a Hammerlund HQ170-C at a salvage yard in S.A. for $.15/lb
The top trim on the front is a little bent, but the insides are in
excelent cond.  I need to put a pwr cord and a new fuse holder on it
to check it out.  I also bout a Hallicrafters SX-99 and a matching
R-46B speaker at a local yard sale for $25.  Needs some of the molded
paper caps replaced but picks up am bcb like nothing else.
Even better, it's in near mint cond. *with* the original tubes no less. 
 The only set I passed up was a collins that looked like it had been
used as a practice target by the military.  It was about the size
of the hammerlund but weighed 5x as much.
PW> Does it have a listed reciever cert. number?  RL14A is 
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RBK>   No, it doesn't, but I'm quite certain it'd be a "C", since it was 
RBK> spec'd for 47.42 use.
 Makes sense.  From what the amnual says I think they were spec for
all three.  I was kinda hoping it would say one in particular since
the parts values are different in some circuits depending on which
band it was used for.
RBK> says 500-943C on the solder pad, and the transmit board is a 1974 
PW>       ^^^^^^^^
PW> That's good.  The L.O. uses a third overtone xtal fed to a  tuned circuit
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PW>10.7Mhz 1st. I.F. which is sent to the 10.245Mhz 2nd I.F.
RBK> Okay, I'm following most of this, so far.. (I recall that MOSFETs can 
RBK>be _very_ fussy at times)
 Yep. Especially the old ones.  With fets that age, I can almost garuntee 
that the slightest H.V. strike will take them out.  Modern ones can be
just as tricky but they usually have better protection from that.
PW>> given, you should be able to widen it up for all of 6M.
RBK>   Good, good..
 Thought you might like that bit of news.   And since you'd have to
change about half the parts, it gives you a chance to tighten up the
specs.  I've done the same with an old cb linear for use on 10M
It only puts out about 100W, but I went thru and put in parts with
better tolerances to keep more stable and to keep the signal a *lot*
cleaner.  It's amazing what changing 10-20% parts out with 2-5% ones
can do. :)
PW> Second, is that the 2nd gate has *NO* protection other than 
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PW> 100K, 680ê, and a 68ê resistor to the unreg. 13.8VDC source.
RBK>   Eiewww, not good at all...
 Nope. :(
PW>  I'd suggest either replacing it with one that has some overvoltage
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PW>away from it.  (me, I'd do both just in case)
RBK>  This is still Q101, the dual-gate MOSFET? Or are these two seperate 
RBK> devices?
 Still 101.  It's a four pin can.  (as per e-mail)
RBK> Only ones I can seem to locate like this are two -202 case devices on 
RBK>the back of the receive board, heat-sinked to the back of the chassis, 
RBK>next to the antenna socket..
 Those are the audio output ones. (Q112, 113)
PW> The other is that in situations where there was strong image 
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RBK>   Can't tell, looks like it's soldered in place. (sigh)
 *Should* be stamped on top of it.  If you've got a xt motherboard laying
around pull the 14.31818Mhz xtal off of it and try it as a recieve
xtal.  It should put you on 53.6545Mhz and  if conditions are good you
might catch the o/p from a rptr or two.  That would give you a chance
to see what the 2nd I.F. is.  (not to mention seeing if the rest of it 
works. <:  )
RBK>number 501-183C.
88 88
PW> standby current lost to the xmtr.
RBK>   Oh, really?!?!?! I kind of wondered about this, when I realized that 
 RBK> it did
 RBK> have seperate xmit and rec PCBs on it. Wow! I _have_ been dinking 
around 
 RBK> with
 RBK> the idea of my own 6m repeater, and this littl' jewel could be the 
heart 
 RBK> of
 RBK> it!!
 Yep. :)  I don't think the relay borad will make any difference if
you use it as a repeater though.  And before I forget... ;)
The manual has the schematic and hookup listing for the matching 
ctcss en/decoder.  So your covered there as well.
PW>  Another is that from what I get out of the reading is the 
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PW> just yet)
RBK>  I'm a _little_ familiar with the autoprotect circuitry, it's a wise 
RBK>thing to have, rather than just "crowbar" it off. :-(
 Agreed.  I've the rf power deck from what I *think* is a ge mastrII.
It has the swr taps running back to the pre-predriver board.  And while
I need to get it running for use on 2m, I'd like to keep the auto powerback
circuit intact.  All I've got is a HTX-202 for 2, and I live about 25mi
s of S.A. in a low spot.  A few watts more would sure help.  But till
I can id the finals and rework the output filter......
PW>  Now for the really fun part.  :>
RBK> Yup, in the next message!
And again no less. ;>
 -=> Yours sincerely, Paul Williams <=-
... Orb 'em all and let the Prophets sort 'em out?  Jeff
--- Terminate 4.00/Pro
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