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The blue RV1 is the bias set for the IRF. The drive is set by the preset R136 before the driver transistor.

Thomas, I would recommend you do both. The diodes may not take the all power from your other antenna. Yes the two diodes in parallel are connected between pin 12 of k1 and ground. Both diodes should

Another nice video Peter.? Thanks.?? In your comment on the pot in the RF amp stage, I think you made the same mistake that I did: assuming that that pot was for setting the IRF-510 bias (as was

There's not much in it that most people here won't already know, but a video review I've just uploaded could still be of interest. Review: BitX40 7 MHz transceiver module

Raj, Thank you for the response. You confirm my fear that the danger of damage is real and present. I am very much a beginner at this sort of work. I have excellent mechanical and soldering skills,

Thomas, At pin 12 of K1 relay solder 2 4148 diodes in parallel but in opposite polarity. This will limit the receiver from getting high RF voltage. Also if you cut the track between K1 pin 12 and

Not really. I would guess the confusion arises because there are two different inversions happening. The first is what you experienced with the DDS -- the frequency span is the same but TUNING is

How likely is this to happen? Bitx40 connected to 40M resonant antenna perpendicular to another antenna with a 100W transceiver running a Winlink gateway. I fully expect front-end overload and nasty

Trip - KT4WO The infamous BITX-Click has been well documented on this forum, but it was mostly some time ago. There is a capacitor that couples the receive audio from the BFO mixer

Trip et al, It has been discussed before. Search for “PTT noise” or PTT transient”. Cause and solutions both simple (ignore it) and complex (Multi-transistor multi-relay switching schemes to

Trip, I found that while I had my board sprawled all over my bench that the click on Xmit was real loud with all my cables crossing each other, when I got the wiring cleaned up and separated and the

Just to the controls hooked up...for testing. Upon key up I get a loud "pop" in the speaker. I searched the group and didn't see this issue. Ideas?? Trip - KT4WO kt4wo67@...

There is an excellent and easy to remember rule of thumb on sideband inversion.? Explained here: Sideband Inversion | | | | | | | | | | | Sideband Inversion Radio electronics blog.

Hi John I had a chance to try some testing with sideband inversion. BFO = 11.9986 MHZ and VFO = 4.8486 MHZ this gives me a starting frequency of 7.15 MHZ(RF = BFO - VFO). Set the encoder to increase

Sure I'll do it now. Thanks. Tom

tom, i couldn't find the other file. can you put them both under a folder with your callsign? - f BITX20@...> wrote:

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /BitX40 Spectrum Output/ssh.bmp Uploaded by :

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /BitX40 Spectrum Output/ssl.bmp Uploaded by :

Hi everyone, I'm going to upload 2 pics into the file section if someone is able to look at them for me. I have two signal approx 500-700k away from the tuned freg and less than 20dbm difference

http://ak2b.blogspot.nl/2015/01/si5351-simple-vfo-hardware-setup.html On W5KUB (facebook) there is also the sketch. Not sure if attaching to this mail is the way to go. Ron – PA3FAT Verzonden: 14