[Boatanchors] [Heathkit] DX-35 meter

[Gary Schafer]

Unless the internal meter resistance is the same you will need to adjust the
shunt value to make it read right.

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Bob Macklin
> Sent: Wednesday, March 04, 2009 8:51 PM
> To: Sandy; k4oah at mindspring.com; Heathkit Reflector;
> boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] [Heathkit] DX-35 meter
> 
> If you decide to use a good 1ma meter just use the same shunt values shown
> in the DX-40 schematic.
> 
> Bob
> K5MYJ
> ----- Original Message -----
> From: "Sandy" <ebjr37 at charter.net>
> To: "Bob Macklin" <macklinbob at msn.com>; <k4oah at mindspring.com>; "Heathkit
> Reflector" <heathkit at mailman.qth.net>; <boatanchors at mailman.qth.net>
> Sent: Wednesday, March 04, 2009 5:45 PM
> Subject: Re: [Heathkit] DX-35 meter
> 
> 
> > Better be prepared to shange the meter shunts as well!  The DX-40 meter
> > WOULD be more "civilized"!  The AT-1 also had one of those "jumping"
> iron
> > vane meters.  The Triplett and Simpson iron vane movements were at least
> > damped.  The Surite meters were cheap crap!  They were only a dollar
> though.
> > Some models less than a dollar.
> >
> > 73,
> >
> > Sandy W5TVW
> >
> > ----- Original Message -----
> > From: "Bob Macklin" <macklinbob at msn.com>
> > To: <k4oah at mindspring.com>; "Heathkit Reflector"
> <heathkit at mailman.qth.net>;
> > <boatanchors at mailman.qth.net>
> > Sent: Wednesday, March 04, 2009 5:37 PM
> > Subject: Re: [Heathkit] DX-35 meter
> >
> >
> > I screwed up and looked at the DX-40 meter.
> >
> > The DX-35 does show a 3ma/500 ohm meter. Part number is 407-33.
> >
> > If it were my unit I would change the meter circuit to the DX-40
> version.
> > It's a better meter.
> >
> > Bob
> > K5MYJ
> > ----- Original Message -----
> > From: "Garey Barrell" <k4oah at mindspring.com>
> > To: "Heathkit Reflector" <heathkit at mailman.qth.net>;
> > <boatanchors at mailman.qth.net>
> > Sent: Wednesday, March 04, 2009 3:32 PM
> > Subject: Re: [Heathkit] DX-35 meter
> >
> >
> > The DX-35 meter was a Shurite brand "moving vane" type of meter.  These
> > were the bouncing betty style that took so long to settle after moving
> > it made it almost impossible to accurately dip a final.  I suspect this
> > had more than a little to do with the supposed failure-prone power
> > transformer!  Typically these meters had relatively low internal
> > resistances.
> >
> > The DX-40 had a D'Arsonval "moving coil" meter that was much more
> > civilized!  :-)
> >
> > Techniques for measuring the internal resistance of meters is covered in
> > just about any ARRL Handbook.  For a three mA movement, you could just
> > measure it with a good quality DMM as these put VERY little current
> > through whatever resistance is being measured, typically in the uA
> range.
> >
> > 73, Garey - K4OAH
> > Glen Allen, VA
> >
> > Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
> > <www.k4oah.com>
> >
> >
> >
> > Tom Chesek wrote:
> > > ...but the meter for the DX-40 is a part number 407-46. The original
> > > question referenced part number 407-33 which is what the assembly
> manual
> > > calls for.
> > >
> > > Tom K3TVC
> > >
> > > .
> > > ----- Original Message -----
> > > From: "Bob Macklin" <macklinbob at msn.com>
> > > To: "Tom Chesek" <tchesek at epix.net>; "WØQFC"
> <erastber at tampabay.rr.com>;
> > > "heathkit" <heathkit at mailman.qth.net>; <boatanchors at mailman.qth.net>
> > > Sent: Wednesday, March 04, 2009 5:59 PM
> > > Subject: Re: [Heathkit] DX-35 meter
> > >
> > >
> > >
> > >> The schematic shows a 1ma/100ohm meter on the DX-40.
> > >>
> > >> Bob Macklin
> > >> K5MYJ
> > >> Kent (Seattle), Wa,
> > >> "Real Radios Glow in the Dark"
> > >>
> > >> ----- Original Message -----
> > >> From: "Tom Chesek" <tchesek at epix.net>
> > >> To: "WXQFC" <erastber at tampabay.rr.com>; "heathkit"
> > >> <heathkit at mailman.qth.net>; <FLBOATANCHORS at yahoogroups.com>;
> > >> <boatanchors at mailman.qth.net>
> > >> Sent: Wednesday, March 04, 2009 2:33 PM
> > >> Subject: Re: [Heathkit] DX-35 meter
> > >>
> > >>
> > >> The 1984 Master Parts file lists it as a 3 milliamp DC meter. The
> listing
> > >> does not give a resistance value.
> > >>
> > >> Tom K3TVC
> > >>
> > >>
> > >> ----- Original Message -----
> > >> From: "WXQFC" <erastber at tampabay.rr.com>
> > >> To: "heathkit" <heathkit at mailman.qth.net>;
> > >> <FLBOATANCHORS at yahoogroups.com>;
> > >> <boatanchors at mailman.qth.net>
> > >> Sent: Wednesday, March 04, 2009 4:09 PM
> > >> Subject: [Heathkit] DX-35 meter
> > >>
> > >>
> > >> Does any one know the internal resistance of the DX-35 meter p/n
> 407-33?
> > >>
> > >> TIA
> > >> Gene, WXQFC
> > >>
> > >
> >
> >
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