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

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  • Bill Dumke
    Kees, Can you send me a link to the errata sheet ? I couldn t find it. Thanks, Bill wa9pwr
    Message 1 of 9 , Apr 30, 2007
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      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
      >
      >
      >
      >
      >
    • 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 2 of 9 , May 1 7:42 AM
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        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 3 of 9 , May 2 3:17 AM
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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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