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Consider either a bandpass or band stop filter. ?You can use Elsie LC program (downloadable free) to test out the filter. ?My bandpass filters matched the test circuit very well. Leave the low pass

First step will be to get a PTO up and running. ?I also am looking at a Vackar. ?Very fascinating. ?One reason to try the PTO is to see if it is quieter than an ARDUINO VFO. ?It also draws

Well, if my dad were still here ( W4MAI - sk 2006 ), he could tell you about how a single 8-bit accumulator would fill an entire equipment closet :0) Many years ago, he worked for IBM? somewhere in

Does mastering (= PHD) the 8088 count in the contesr? : o )) ham 1957 retired 1997 72 73 John N3AAZ

Yes, "we" are. Simply put, it was fun discovering the parameters of, and avoiding running afoul of Hans' encoder debouncing state machine as I experimented with the "My_encoder_de_N4QA" PC app. 72 /

And remember a few weeks ago a new build went thru this... with fried finals, the rx was deaf until finals were changed... receive signal was rf-grounded thru the damaged finals so "nothing" was left

Simon, Michael, They will be IQ signals but the QCX is not intended to be wideband. I'd think C4,7,43-46 would really need reducing. 73 Alan G4ZFQ

Hi Michael, I've tried it from IC5 pins 1 and 7 and it did seem to be baseband audio at that point. I got at least 0 to 24kHz bandwidth feeding my homebrew panadaptor. It was a little experiment into

And with VNC (built into Raspbian) you can operate remote from anywhere! I'm honestly surprised I'm not playing radio from work every day ?

Hello, I was thinking that an add-on pan adapter would be a fun project to try. And knowing just enough to know that I know nothing about this, I thought I'd ask what may be a "simple" question. Can I

One thing I was looking at was using FLDIGI running on a RPi3 as a “front end” for the QSX. Hans says the QSX should interface nicely with JACK (Jack Audio Connection Kit). Coupled with a touch

Earlier today I was codgertating on "ain't it a shame the QSX is rolling out with an underwhelming display". But then I got to thinking abt my K3 and how rarely I actually touched the FP controls or

Garry, My coding wasn't nearly so interesting. I was building one of the first generation "Network Operations Centers" for the Telco? GTE of the SW in the 80's.?? We primarily did remote monitoring

Ten statement Fortran plus Fortran IV for the IBM 360, featuring the WATFOR and WATFIV compilers. 1st ed. 1970 - my senior year in high school. Hard to believe I was perusing that book nearly a

Jack / KZ5A, It's more like riding a 'unicycle'!? I'm 'here' to save you from hours of frustration!? I have a box of IBM cards (new) and a FORTRAN coding ruler so you can find coding errors!? :)

i finally got tracking on the replacement uP for my QCX40, looks like it will be here in a week or so.?? That shipment also includes a new QCX 20 to build after I get the QCX40 percolating.? Today

Many thanks for some great advice!? I have a dummy load and I need to get in the habit of leaving it connected until I'm really ready to go. -- Jim, KJ7EZN? ? 73!

Allison Agreed, my PLL reference was to the fact that there is a control loop but that it is slower than a conventional PLL. H&P is very useful if done properly, but can be a real nightmare if done

Mike Several years ago when I was experimenting with H&P designs I found that a Vackar VFO was better for my H&P uses. In addition to being stable, the output is low impedance and seems relatively

If you connect one end of a cable shield to ground, you create a Faraday Shield ( Google it ) and having only one end connected to ground prevents spurious current loops creating noise. You must of