Re: ICR-100 10.7MHz IF TAP Mod.
- At 09:20 07/05/02, [softrock40] Digest Number 1723 wrote:
> Posted by: "Kees & Sandy" windy10605@... keesthehamNo it b***dy isn't!
> Date: Tue May 1, 2007 7:54 am ((PDT))
>73 Kees K5BCQ
See message #10942:
>Attachment(not stored)and take heed of the "not stored"
Nor _should_ it be: read Bill's post carefully;
>-- Bill Dumke <billd@...> wrote:He asked for a _link_, not a _copy_!
>Can you send me a link to the errata sheet ? I couldn't find it.
>Thanks, Bill wa9pwr
Elecraft publish their manuals at
If you would prefer a tabulated contents list, see
the Elecraft Document Download Page,
AKA "Document and Software Download Page".
Instead, you have sent everyone on individual email
a copy of something Bill didn't ask for and which
will be no use to them unless they own an XG1.
And precious little use to them even if they do...
The erratum is a modification to R8, in the 34dB attenuator
Theoretical: 34dB 1252R469 series, 52R035 shunt, Zo=50R
Original: 34.09dB 1K27 52R3 Zo=50R27
Modified: 33.89dB 1K24 52R3 Zo=50R22
[ Calculated using "Pi Attenuator Calculator" by Chemandy Electronics
http://chemandy.com/calculators/calculator-index.htm, also fits
well between the 30dB & 35dB rows in table "Pi-Network Resistive
Attenuators (50R)" in ARRL Handbook 2001 [30.48]. ]
Is it worth making the mod on an already-built XG1,
for an attenuation adjustment of around +/- 0.1dB?
Is it worth Bill making the mod, if, as he appears to be,
he is not operating his XG1 into a 50R load?
Certainly not - he should fix the load impedance first.
Fortunately, the digest protects me from this :-)
but not from the approximately 64 lines of quote
you appended to your one-word post :-(
>Kees & Sandy wrote:It isn't a "1uV" pad, it is a 34dB pad - if it is properly terminated.
> > I went to the Elecraft site and .......AH, HA, there is an eratta
> > changing one of the 1uV pad
Then, if it is fed 50uV it will deliver 1uV to the load.
That's two ifs , only the second of which is under Elecraft's control.
>resistors for both the XG1 and XG2And if you didn't top-post, this would have been in logical order
> > ....seems like R8 is supposed to be 1.24Kohm.
and I wouldn't have needed to reiterate it above in my explanation.
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