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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
    • 0 Attachment

      Attached

      73 Kees K5BCQ

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

      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))
        >
        >Attached
        >73 Kees K5BCQ

        No it b***dy isn't!

        See message #10942:

        >Attachment(not stored)
        >E740067E%20XG1%20errata%20rev%20C1.pdf
        >Type:
        >application/pdf

        and take heed of the "not stored"

        Nor _should_ it be: read Bill's post carefully;

        >-- Bill Dumke <billd@...> wrote:
        >Kees,
        >
        >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
        http://www.elecraft.com/manual/

        If you would prefer a tabulated contents list, see
        http://www.elecraft.com/K2_Manual_Download_Page.htm
        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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