Cool Stuff from N6QW

-

Cool Radios from the N6QW Laboratories!

 2/4/2017 ~ Request for AGC circuit being used. This was supplied to me by PD7SSB who came up with modification to my 20M Shirt Pocket Transceiver Project. It is an audio derived circuit. I have no details for implementing an RF/IF derived circuit such as the W7ZOI Hycas.

2/5/2017 ~ More on the AGC
Tribal knowledge here. The 4.7K Ohm Resistor connected to the output and feeding the diode was replaced by a 25K trim pot in series with a 3.3K fixed resistor. I found that there was too much "AGC" action with just the 4.7K ohm as shown on the schematic. The 25K pot was wired as a variable resistor (If you have to ask how to do that --turn off your soldering iron). Thus the range is 3.3K to 28.3K --now giving you a span of adjustments. Hold off  sending me an email as there will be some who suggest just using the 25K pot with one end to ground and the center wiper to the diode and the other end connected to the LM386 output. That is not what I did and I leave that to others for experimentation. The photo below the schematic is actually what is on the schematic including the microphone amplifier, audio amp, AGC and S Meter circuitry.

 
 
 
 
N6QW Two Band XCVR:  Mic Amp, Audio Amp, AGC, and S Meter Board
 

73's
Pete N6QW

Comments

Post a Comment

Popular posts from this blog

The uBitx is inhaling RF at N6QW

-
Image
Catch the Wave ~~~ The uBitx is Alive!12/23/2017 ~ On the Air QSO with the uBitx! The uBitx is a real winner --so get off your butt and order one! Listen to the on the air comments and also make the N6QW linear amplifier hack as you will need that during poor band conditions. The fact that you can run a linear amp without hiccups and burps is a testament to the design! Thank you Farhan.

The "Cool Juliano Blue" LCD has to be a factor in how good it sounds! I am also told that the blue display is a major factor in the fight against global warming. OOps forgot there is no global warming or so our leader tells us. Merry Christmas and Happy New Year to All. PS. When you watch the video note that the guy with the FLEX6500 said you sound good and even compared what he spent and what the uBitx costs. The uBitx stands tall with the Big Dogs! Keep in mind my "hack' to add a linear amplifier control. Anymore out here on the left coast when operating on 40 Meters --QRP is some…
Read more

The Simpleceiver Plus Project ~ An Ultimate Form of DifX

-
Image
Return of the Simpleceiver Plus! 9/12/2017 ~ Arduino Sketch Code for the DCRI have posted the code for the Simpleceiver Plus DCR on my website and you can link to it from here http://www.n6qw.com/Simpleceiver_Plus.html I have also copied the complete blog thread on the Simpleceiver Plus DCR to this page so that there is an easy archive of all of the info that is on this blog. The downside is that it takes a long time to load since it is a huge file. But the plus side in the event we have another ghost in the machine with this blog (like losing the comments) the data will not be lost. This will be the last posting to this thread. The next series will be on the conversion to the SSB transceiver. 73's Pete N6QW My Apologies "The Ghost in the Machine" ate the Comments. I have no idea how that happened or how to get them back.7'3's Pete N6QW 9/08/2017 ~ The Arduino/Si5351/Display Wiring The above is a pictorial wiring diagram since some homebrewer's are new to schematic dr…
Read more

21st Century Homebrew SDR SSB Transceiver Project

-
Image
Roll Your Own SDR SSB Transceiver N6QW Moves Totally to the Dark Side of the Hobby!11/27/2017 ~ Observations and 1st DX ContactToday I wanted to spend a bit of time comparing the new SDR homebrew transceiver to "filter" type rigs I have built. First though I do want to share that I worked my very 1st DX station with the SDR rig and that was XF1IM who is in lower Baja California. The distance was 1600 miles running 100 watts. So I am beaming from ear to ear. Firstly I do want to acknowledge once again the pioneering work of Charlie, ZL2CTM and his several you tube videos that got me kick started into rolling my own SDR rig. Notwithstanding I do have several SDR kit radios including several Softrocks and the Omnia based on the Peaberry --and even one that uses a Softrock with a Raspberry Pi. So I am not brand new to SDR, but I am new to rolling my own. Above all there seems to be a clarity to the signals and perhaps that is because the bandwidth may be a bit wider. It was even su…
Read more