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So here is what I wound up doing that significantly increased my output power on my sBitx V3.? That is without having to move the volume slider up each and every time I transmitted. I backed up the

Gerard, A nanoVNA in 2 port mode would be the ideal tool to plot the response of your filter, less tedious than using a signal generator and a scope. The nanoVNA is designed for a 50 ohm

Gerard, Injecting a signal at TP13 sounds good, the amp at Q11,12,13 should drive the filter with a proper 50 ohm source impedance if it was built as per the uBitx schematics. A filter using the

Thank you. I knew there was a technical document written concerning it but couldn’t find it on github. Much appreciated! David

Merci à tous pour vos réponses très technique. but... It’s a bit jungle with 45mhz filters On the diagram of the Ubitx V6, it is noted that it is a 45M15F. I never found the datasheet on the

Hello Jens, Gordon is correct.? The original DE and V2 bias were to be set at 250ma.? Here is the link to the archive of that directive: https://www.sbitx.net/index.php/2023/05/ There is other

I think the original suggestion was 0.250 for the current through the MOSFETs. I think I said some of mine at 0.360 amps.

Ford said::? "The calculated solution for 650 to 500 is 969 nH and 3 pF." As Allison pointed out, we are targeting an input impedance for the network of 50 ohms, not 500 ohms. He also said: "It

Gerard. I believe that statement refers to the crystal filter module, without L7 and C212. There are such modules that are 500 ohms resistive, though they also have a significant capacitive reactance

Hello ... anybody knows what is the correct PA BIAS ??? PA is with 2x IRFZ24N . ( ? Volts at the Gate ; Current – ma - increase when push PTT without Mic-Audio) 73 , Jens / HB9JOI

What I find interesting is uBitx V3 though 6 the terminations for the filter that is the crystal filter plus matching network is between a Mixer (DBM) and TIA amp. Both of which are NOT 500 ohms and

Hello, I just made calculations following the instructions of the site I quoted https://circuitdigest.com/article/impedance-matching-filter-circuit-design-lc-l-and-pi-filters If we consider that the

David, I asked pretty much the same question a while back, and Evan replied with this document. I have not started the conversion yet.

Thank you, Farhan, for pointing me in the right place. I compiled all info to the single document, corrected typo errors and saved as .pdf into Files/SBITX_V3 folder. Maybe it will help to

I had a lot of bed adhesion issues trying to print the case with PLA. I switched to smooth glass bed with some glue stick applied on a preheated bed which solved the edges curling up. 73 Glenn VE9GJ

The calculated solution for 650 to 500 is 969 nH and 3 pF. It seems to me that the only way to actually find the correct solution is to lift the filter out of the circuit.? Terminate it using a 500

I use on-line calculators to figure out matching.? One of my favorites is here: https://leleivre.com/rf_lcmatch.html Using 45 MHz In the configuration on the schematic, 50 j0 ohms into a series

I have downloaded both prints and can spend the time to figure out which components need changing to goto the 510 finals but was hoping there was a .txt file on github. I looked and didnt see

Petr, You will find the latest manual online on sbitx.net. it is available in the column on the left hand side. It also documents all the hardware updates. The circuit diagrams are

Hi folks, is somewhere the manual for latest sBITX V3 please? I found just an old V2 document... Looking for user manual as same as latest schematics and mods done on V3. Thanks, Petr