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I happened to be working on an MKARS80 which is a variant on the BitX. I realised that this rig uses a Pic 16f818 as a frequency counter with LCD readout and it generates a huff n puff voltage. If

Just a reminder to those using the si5351. Turn OFF unused outputs. They will default to a frequency and as in my case cause 'sproggies' across the bands. You can check using a scope etc. to check

not at all. you will be able to upgrade that as well! just wait a few... BITX20@...> wrote:

So does this mean the Bitx40 board that just arrived is now out of date? What has been updated, is there an update for existing boards or do I buy another Bitx40? Bruce VK2RT

we have been working at an update to the bitx40. i was to give hfsigs the final go yesterday but i have had to stall it due to a family emergency. the new bitx40 will roll out very soon! until then we

http://archive.feedblitz.com/602502/~4780902 Sent: Saturday, December 17, 2016 2:58 PM To: BITX20@... Subject: [BITX20] Help with Digital VFO install Here is my hack problem. I

I too had to get rid of C91 when adding an external VFO.? Details here, in the last couple of paragraphs: Hacking the Hackable BITX 40 Module: VFO is the Way to Go!? | | | | | | | | | |

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