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Re: [softrock40] ICR-100 10.7MHz IF TAP Mod.

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  • Kees & Sandy
    Attached 73 Kees K5BCQ -- Bill Dumke wrote: Kees, Can you send me a link to the errata sheet ? I couldn t find it. Thanks, Bill wa9pwr ...
    Message 1 of 9 , May 1, 2007
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      73 Kees K5BCQ

      -- Bill Dumke <billd@...> wrote:

      Can you send me a link to the errata sheet ?  I couldn't find it.

      Thanks, Bill wa9pwr

      Kees & Sandy wrote:

      > I went to the Elecraft site and .......AH, HA, there is an eratta 
      > changing one of the 1uV pad resistors for both the XG1 and XG2 
      > ....seems like R8 is supposed to be 1.24Kohm.
      > Didn't do much......  with 1uV input to the PCR100 on 7.040Mhz, 
      > it still reads 40dB on Rocky and the PCR100 attenuator still drops the 
      > signal 20dB which is correct and verifies readings from the PCR100 
      > antenna through the Rocky software. That would be -127dBm for a signal 
      > that can still be copied down another 10dB or -137dBm. Nice little 
      > wide range receiver setup.
      > 73 Kees K5BCQ
      > -- "Kees & Sandy" <windy10605@...> wrote:
      > I guess I don't understand the concern about the PCR100 sensitivity 
      > being down when using the output of L108 as a tap point because it's 
      > the SDR signal you are interested in. If you want to use the PCR100 
      > "as is" --AND-- the SR Lite SDR function ....without pulling/jumpering 
      > the tap point, I will need another tap point. The center tap 
      > (presently unused) on the input side of L108 works for that and does 
      > not seem to have the 5-10dB PCR100 loss that a tap on the output side 
      > has ....and you still benefit from the 230Khz PCR100 filter.
      > Is there some way to make consistent measurements for comparison ? I'm 
      > still at a loss to explain the observed signal level differences 
      > between "50uV" and "1uV" off my XG2 Signal generator card. What do you 
      > guys measure ? I've seen Bill Dumke's data only.
      > 73 Kees K5BCQ 
      > -- "qrper723" <qrper72@...> wrote:
      >  Hi all.
      >  I've finished my modification of PCR-100 IF-10.7MHz.
      >  I put my data and photos into a Files -> JA9MAT - PCR100 10.7MHz IF TAP.
      >  It works well and to be an all band SDR.
      >  Thanks Tony and Kees, 73 ja9mat Hidehiko.
      > Yahoo! Groups Links

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    • Len Warner
      ... No it b***dy isn t! ... and take heed of the not stored Nor _should_ it be: read Bill s post carefully; ... He asked for a _link_, not a _copy_!
      Message 2 of 9 , May 2, 2007
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        At 09:20 07/05/02, [softrock40] Digest Number 1723 wrote:
        > Posted by: "Kees & Sandy" windy10605@... keestheham
        > Date: Tue May 1, 2007 7:54 am ((PDT))
        >73 Kees K5BCQ

        No it b***dy isn't!

        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:
        >Can you send me a link to the errata sheet ? I couldn't find it.
        >Thanks, Bill wa9pwr

        He asked for a _link_, not a _copy_!

        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?

        Probably not.

        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:
        > >
        > > I went to the Elecraft site and .......AH, HA, there is an eratta
        > > changing one of the 1uV pad

        It isn't a "1uV" pad, it is a 34dB pad - if it is properly terminated.
        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 XG2
        > > ....seems like R8 is supposed to be 1.24Kohm.

        And if you didn't top-post, this would have been in logical order
        and I wouldn't have needed to reiterate it above in my explanation.

        Regards, LenW
        Content of a follow-up post should exceed quoted content. (rfc1855)
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