[Hallicrafters] SR-2000

[Jim Liles]

Good morning Jerry:
Congratulations on the SR-2000 acquisition.  The SR-2000 should be capable 
of moving the S-Meter to S5 with a 3uv signal and S1 with 1uv and S9 with 
50uv.  Also, you should be able to distinguish a two tone .05 uv signal.  If 
you can clearly distinguish a .1uv two tone or carrier and sidebands on an 
AM signal, look at the S-Meter tube and circuitry otherwise start at the 
6.5MHz IF strip.  T1 and T2 cannot be adjusted without a sweeper --- tried 
and wore the slugs out.  If you have a problem with the 15 meter band, there 
is a design booboo that may be present.  The 20 meter coils for the in and 
out of the first rf amp resonate in  or very close to 21MHz when switched to 
any other band than 20 meters.  Also, being directly adjacent and 
unshielded, couples to the 15 meter coil and imparts resistance to the 15 
meter tank --- the grid dip effect.  For some strange reason, they fixed the 
problem in the 12BY7 final drive circuits (18pf rather than 47pf) but forgot 
the other two.  One other question, can you overdrive the finals in tune 
mode?  --- Kindest regards Jim K9AXN

> Message: 1
> Date: Mon, 11 Dec 2006 09:27:35 EST
> From: K5ZGE at aol.com
> Subject: [Hallicrafters] SR2000
> To: hallicrafters at mailman.qth.net
> Message-ID: <bd9.a647d3f.32aec4d7 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> I have a SR2000 that has a problem with the S meter.  I have checked
> components and tubes and everything appears to be within tolerance.  The 
> maximum
> deflection of the meter is 40db  over S9.  It takes about 150 microvolts 
> to read S9
> on the meter instead ofthe specified 50 microvolts.  The AGC seems to be 
> ok
> and the sensitivity is less the .7 microvolt on 20 meters.
> Has anyone had this problem and could offer suggestions before I modify 
> the
> circuit.  The transmitter functions normally with full output and meter
> indications are ok.  Either I am not getting sufficient negative AGC 
> voltage to cause
> full scale deflection or I need to determine a way to calibrate the S 
> meter
> circuitry.  This represents about an indicated 20 db loss in signal 
> strength.
> I would prefer the meter circuitry to indicate properly.
> Sure hope someone can  help.
> Jerry
> K5ZGE
> 318-728-3750
>
>
> ------------------------------