Fw: [QRPLabs] Continuous tone in the QMX Receiver

Ian G4GIR All Messages By This Member #109421 开云体育 I have just measured the frequency of this tone and it is actually 706 Hz. ? Any ideas anyone? ? 73 ? Ian G4GIR ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Ian G4GIR via groups.io <i.frith@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 06/09/2023 15:53:38 Subject: [QRPLabs] Continuous tone in the QMX Receiver Hello All ? Almost a 100% build success. All appears to be working well with the QMX. Except for a continuous tone about 800-900Hz in the headphones. ? It isn't the CW side tone as I hear this when key down I set it to 500 Hz. ? It is heard on all bands too. ? I've looked at the forum but nothing shows up. ? Anyone had this problem? ? Thanks ? 73 ? Ian G4GIR
Tronald Dump Member Profile All Messages By This Member #109425 On Wed, Sep 6, 2023 at 03:53 PM, Ian G4GIR wrote: ? All appears to be working well with the QMX. Except for a continuous tone about 800-900Hz in the headphones. ? ? It is heard on all bands too. ? I've looked at the forum but nothing shows up. ? Anyone had this problem? It's not a problem, it's a DC RX from memory. A real world antenna will have enough galactic + atmospheric noise to greatly overcome the carrier osc (offset at 800Hz or so) from signal freq (DC rx's being of course zero IF). 73 de Tronald. MAGA - Make Amateur Radio Great Again.

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