[NJARC] Radio Debugging PS

[Scott Roberts]

Gave it a quick check- nothing. I did the fast test of the
receiver: removed the grid cap of the 6R7, and touched it. Got a
good hum, so audio end is ok. When I get back I will have to
trouble shoot the RF...

Of course, neither signal generator felt like working tonight...

I'll go over everything Monday, and see what I find.

Scott

--- Scott Roberts <ng19delta at yahoo.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Think I'll hook up the speaker & antenna- see how it works
> before
> cosing up for the weekend(see previous posting)!
> 
> :) Thanks Al!
> 
> And I don't worry too much about the "ideal" being "ideal" I
> just
> meant that phrase as the numbers being closer to what they're
> telling me they want.. I know 70 years will make some
> changes...
> :)
> 
> Scott
> 
> --- Al Klase <al at ar88.net> wrote:
> 
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > See below.
> > 
> > Scott Roberts wrote:
> > > Visit our web site - See http://www.njarc.org
> > > _______________________________________________
> > > John(and Al)
> > >
> > > I made the changes, and it -did- pull the numbers a bit
> > closer to
> > > "factory ideal", 
> > Get that "ideal" stuff out of your head.  It will make you
> > crazy.  If a 
> > plate is suppose to be 270 volts and your meter says 6,
> there's
> > a 
> > problem.  (Like an open plate load.)  If a screen grid is
> > suppose to be 
> > 100 volts, and the meter says 50, the screen resistor is most
> > likely 
> > cooked high. ETC ETC  - READ THE SCHEMATIC!
> > 
> > > although my 5 pins are still high- actually got
> > > higher with the changes... 
> > READ THE SCHEMATIC!  Pins 5 and 8. cathode and supressor
> grid,
> > are wired 
> > together on all three 6K7's.  In spite of this the stupid
> > voltage chart 
> > claims different voltages!  Impossible.  Use the pin-8
> values. 
> > Charts 
> > like this are just a guide.  HOW DOES THE RADIO WORK?
> > > And the beat osc. 6J7, is showing 8.75
> > > on 3&4(should be 150, each) and 165 on pin 6(should be
> 350).
> > > Also, I have a -32 on pin 5 of either 67 Mixer or 6J5G
> Osc.(I
> > > have to recheck- it is showing on one in the first check,
> the
> > > other on the second, so I may have written in the wrong
> > box...)
> > >   
> > Pins 3 and 4, the screen grid and plate, are low because the
> > BFO is not 
> > turned on, SW 2.  READ THE SCHEMATIC!  tell us which tube
> > elements are 
> > involved, so we don't have to look them up.  If the switch is
> > on, turn 
> > the set off and ohm the circuit and find out why there's no
> > voltage.  
> > READ THE SCHEMATIC!
> > 
> > HOW DOES THE RADIO WORK?  do you get a beat not when tuned to
> a
> > station 
> > and you turn on the BFO?
> > > I am going to retest the tubes before I proceed further. 
> > > Still trying to figure why the Beat Osc numbers are so low.
> > They
> > > are the same with BFO on or off, and with RF at high.
> > >
> > > Oh- and I think that "motorboating like noise" came from
> the
> > > meter! I noticed it coming form that area when I switched
> the
> > RF
> > > gain to full. I think it may have been out of adjustment:
> the
> > > needle went full left. So I turned the adjuster just a
> little
> > to
> > > bring it back up to zero
> > >
> > > As to VTVMs, I have several- now I have to remember which
> one
> > > WORKS! 
> > >   
> > I'd continue using the DVM.  It should be more reliable.
> > 
> > -- 
> > Al Klase - N3FRQ 
> > Flemington, NJ 
> > http://www.skywaves.ar88.net/
> > 
> > _______________________________________________
> > NJARC mailing list
> > NJARC at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/njarc
> > 
> 
> 
> 
>      
>
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