[Milsurplus] Non inductive resistors

[Bob]

Bill, the middle shunt is 65 ohms. The (.) dot was ment for the abbreviated 
word approximately (appox.). Sorry for the confusion. The exciter is running 
50 ohm coax through a tuner and watt meter and then  into a dipole via 650 
ohm open wire line at this point. The T pad resistance values are taken from 
the Heathkit HA-10 manual and agree with yours.
Bob
W1GTH



----- Original Message ----- 
From: "Bill Carns" <wcarns at austin.rr.com>
To: "'Bob'" <hoopmonk at snet.net>
Cc: "'Milsurplus'" <Milsurplus at mailman.qth.net>; "'Boatanchors'" 
<Boatanchors at mailman.qth.net>; "'ARC 5'" <ARC5 at mailman.qth.net>
Sent: Monday, September 23, 2013 10:48 PM
Subject: RE: [Milsurplus] Non inductive resistors


> Those values are way wrong for a 6 bd pad in a 50 ohm system..  If you 
> want
> an unbalanced Pi design, they would be 150 Ohms for the shunt in and out 
> and
> 37 Ohms for the series R in the middle.
>
> If you are looking to build a T pad, then  the series in and out are 16.6
> ohms and the middle shunt is 67 ohm, not 0.65 as you indicated....It 
> sounds
> like the reason that the Caddocks did not work is that you shorted the
> middle with the 0.65 ohm and blew it up..  I have had very good luck with
> the Caddock products.  Just make sure you understand the thermal ratings.
>
> Recommend:
> http://chemandy.com/calculators/matching-t-attenuator-calculator.htm right
> now for a design calculator..  We have a similar calculator on our 
> website,
> but it seems to be down right now.
>
> Bill
> N7OTQ
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Bob
> Sent: Monday, September 23, 2013 8:20 PM
> To: ARC 5; Boatanchors; Milsurplus
> Subject: [Milsurplus] Non inductive resistors
>
> I am building a 6 DB pad to use with my Heathkit Warrior Amp. I am in need
> of some non inductive resistors. A total of three. Two are appox. 16 ohms 
> at
> 25 watts and one is appox .65 ohms at 25 watts. These resistance values 
> are
> just ball park figures. I have tried the Caddock thin film resistors and
> have had bad results. If any one has some carbon resistors that would
> parallel into these values and is willing to part with them I would
> appreciate purchasing same.
> Thanks
> Bob
> W1GTH
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