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This section from Hans' FDIM writeup is key: "The MultiSynth division ratio has a minimum of 4 (for output frequencies over 150MHz). The phase offset register has a maximum value of 127. Since we are

Thanks Jerry, that's what it was. The FDIM paper you linked to ended up on QRP Quarterly - just like his 2019 presentation about the design challenges of the QSX also got published in the current

Hans is selling a complete Si5351 VFO with uC and display that gives quadrature clocks for $33: http://qrp-labs.com/vfo Given all the features, that's a very good deal. Not sure, but I don't think

Karl is right and it’s almost embarrassingly simple compared to what folks had to go thru in the old days. I built a Mini R2 a couple years ago using the phase shift feature in the QRP Labs VFO and

I tried homebrew mixers using BAT54S and BN43-2402 cores, they work just fine. For use with Si5351A? I prefer KISS mixer built on FSA3157 or SN74LVC1G3157 parts. Look for Chris N7ZWY articles about

Cory and the group: As mentioned, the NE602 (SA612, NE6xx, etc -- they're all the same chip) is a handy device indeed, but it's not a replacement for an SBL-1 diode-ring mixer. The biggest factor in

With the Si5351 you can actually create quadrature clock signals directly -?al least for frequencies starting in the 80m band if I remember correctly. See Hans'?writeup in a recent QRP Quarterly

If you want cheap and homebrew, I'd duplicate the mixers on the uBitx from HFSignals. Farhan gives his recipe for the transformers in the circuit description. The Bat54s diodes on the uBitx are

Building phase shift networks or fabbing a board for some DDS chips in TQFP packages strikes me as the hard way to create a quadrature clock. Could use a 7474 dual D-FlipFlop as done on the $21

From looking around online, couldn't you use an NE602 in place of an SBL-1? They're definitely cheaper.

Diz used to sell a DBM kit: https://www.kitsandparts.com/drm.php I used a couple in project and they worked well. Although he no longer sells this kit, his design might provide some food for thought.

Thank you, gents! I appreciate the assistance and understanding. Given the low-buck nature of anything I do, I'm quite alright with a hand built mixer vs a pre-made mixer, even if it is smaller and

Switch-mode, consumer grade power "cubes" (AKA: Wall Warts) are a menace and, to a lesser degree, any consumer grade device containing a microprocessor. Most Internet modems, routers and other network

My thoughts are with the switching power supply. Test it with a test load, anything really.

Thanks Nick. That’s quite an ambitious project. Mike K5ESS Sent: Sunday, November 24, 2019 8:13 AM To: [email protected] Subject: Re: [qrptech] "A Binaural IQ Receiver" QST Mar 1999 Campbell KK7B

Hi Curt, A 3 pound sledge hammer comes quickly to mind. But then you will be without your WIFI :( Lucky me - I don't hear my WIFI in my radios. The router is halfway to the other end of the house. My

See AA0ZZ's article on the IQ Pro with the AD9854 in the May/June 2006 QST. http://aa0zz.com/ 73- Nick, WA5BDU [email protected]> wrote:

Ryan, What you suggest is just what Farhan has done with his BITX and uBITX radios. Ben, K0IKR

Since this is a "tech" group, want to know if others have experienced and solved WIFI RFI. I own a Netgear 6300 "Smart" WIFI router that is located inside the shack on desk near the operating

Has anyone used an AD9854 DDS to provide a quadrature LO? Mike K5ESS Sent: Thursday, November 21, 2019 6:44 PM To: [email protected] Subject: Re: [qrptech] "A Binaural IQ Receiver" QST Mar 1999