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Haven't tried this but it should be possible to use L4 (taking off a few turns?) as the inductor in the LPF, so not wasting any parts. It could even possibly be done on the board, with a capacitor

Peter, I didn't need to remove C91 on my BitX40 board, only L4 and it works perfect with a Si5351 and a Arduino, however i too was getting harmonics from the Si5351, so I added a LPF between it and

Adding a DDS isn't all plain sailing. I got a horrible whine that was coupled into the BitX via the power supply rail. I needed to add some caps and big RF choke to provide isolation. That removed

Yes - C91 has to go.

Here is my hack problem. I have the new BITX40 V3 SMD board and want to use a IK3OIL FLL with it. I found where to take the output on the BITX board for the INPUT on the IK3OIL FLL. Do I put

Anyone able to offer some advice on this? The screen shots from my spectrum analyzer are in a folder under my call sign W7AMH. Thanks, Tom

Raj, Thanks for the clarification, and the opportunity to climb upon the shoulders of those who precede me. Thomas W Noel KF7RSF

Peter, in the video you mention removing a cap in addition to the toroid from the VFO circuit when converting to a DDS VFO. Which cap did you decide to remove (I assume it would be C91)? 73, AL -

SolderSmoke Podcast #192 FPM Rig, BITX Module Madness, HRO Al Fresco, Boatanchor Day, Mailbag | | | | | | | | | | | SolderSmoke Podcast #192 FPM Rig, BITX Module

Ah yes, I see it now.? Thanks.

Tnx for the help. I didn't use the right search terms. I will dig up some of the older posts, but will prob. just live with it. Once I have in metal case maybe it will clean up some. My only issue

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