As I've said before, Let s know how you make out. I do know that at 432Mhz it seriously needed RF amp as it was really deaf. Allison ------------------ Post online only, please no email.

#rcvr

Thanks Hans, and everyone else, for your replies. I guess I was tempted by a less complex build. The reality is that this is my biggest project to date, and you have all helped me to realise, to coin

#bpf #rcvr

Hans, My QDX is being cooperative today in that it is has provided another Blank Receive frame condition. This time the screen shot was captured WHILE the abnormal condition was in progress: The condi

#rcvr #qdx

Alan and Evan, Good news! Rested and alert this morning, I started back on the QDX. I re-visited the solder joints on T2 and L12 spending at least 15 seconds with the iron on each joint. I tried to ge

#qdx #problem #rcvr

Last post didn't. All working...did a realign and all good..

#10W_PA #rcvr #troubleshooting

Hello Ton, Varicaps can be used, but show a much lower Q than a normal capacitor. In the previous century I have measured the Q of the BB112, a 20 - 500 pF varicap. It varied from 50 (400 pF) to 70 (3

#rcvr

Ronald, yes I used an external DVM to measure the voltage with the negative lead on the board ground and the positive lead on the pin. I will check R35 and C21. I didn't think to check R35 on the inpu

#calibration #filter #problem #rcvr #troubleshooting

Mine is for mostly WSPR and other digital modes so I use the presets to accommodate. Can't speak to the multiband sensitivity yet, but I empirically compared my earlier QRP Labs receiver on 30m to my

#bpf #gps #polyphase #vfo #rcvr

...forgot the attachement to the message above #52468

#u3s #rcvr

Justin N2TOH

#analog #avr #si5351b #rcvr

One alternative might be to re-tune/re=program an existing 2.4 GHz RC down to the Amateur band of 2390 to 2450 MHz (1.2 cm). I have no idea if the existing frequency synthesizers can do that, but the

#rcvr #analog #avr #si5351b

Does it have to be a wire that you push through the hole to identify the location. Would a human hair be OK.

#20m #qsx #rcvr

Hello Halden If you are comfortable programming, yes Yes, the ProgRock can do quadrature mode You can also use a 25MHz TCXO like the QCX+ TCXO see http://shop.qrp-labs.com/qcxptcxo No. Sensitivity fal

#si5351a #rcvr

Hi Bruce, The SMA is the Tx output from the bank of LPF's. Each relay/LPF is selected in firmware according to the band required and the RF is routed from the PA out to the SMA through the LPF(s). The

#rcvr #si5351a #shield

See the web page for the XLS file to calculate the R&C values for a wider audio band width. See http://www.4sqrp.com/hipermite.php That spreadsheet is for a constant band pass of 200hz and allows for

#rcvr #qcx

I ordered mine last week, and am going to try it out with both the phasing module and with a Teensy per ZL2CTM: http://zl2ctm.blogspot.com/2019/06/homebrew-804020m-ssb-sdr-phasing-rig.html Ryan Flower

#rcvr #polyphase

Derek, I have repaired a few QCX units for fellow hams. No charge, just part of the fraternity. Let me know if I can help.

#problem #qcx #rcvr

I recently built and installed a QRP Labs polyphase adaptor to use the QRP Labs Tayloe receiver with software lacking support for I/Q decoding. I had socketed C1 and C2 when I built the receiver to su

#polyphase #rcvr

Your first software stop should be a new version of SDR# with I/Q input so you can "see" what it's hearing in real time. SDR# also does a pretty decent job of voice SSB tho abit tinney because of the

#rcvr

Thank you Sir! The best advice I gotten. It's nice to be able to tell my receiver is working. Finding my way around, frequency wise, is the most daunting part of using it. Being able to see & hear mor

#rcvr