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Update on Mythbuster II Transceiver

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SolderSmoke -- Homebrew Ham Radio

SolderSmoke -- Homebrew Ham Radio

Күн бұрын

Пікірлер: 11
@M0UAW_IO83
@M0UAW_IO83 Ай бұрын
Very nice, life and work keeps getting in the way of my projects but one day I'll finish one.
@kk4das122
@kk4das122 Ай бұрын
The rig sounds great. Bill. I like the way your technique has evolved over the years. The way you use copper tape on the plywood for the ground plane and the the organized way you lay out the transceiver. It is easier to build something the second time I find.. After I finish boxing out the sbitx I might join you on the .1 KW amp build... And then think about a single band all analog rig myself. It's a shame you've cornered the market on those vfos... They're getting quite expensive on eBay 🙂
@TheArtofEngineering
@TheArtofEngineering Ай бұрын
Your test bench is like mine....looks like it has been bombed! Nice rig 73 de VK2AOE. I'm currently dipping my toes into a single tube CW rig.
@technishn
@technishn Ай бұрын
Yes the RX sounds great. It is possibly combined things. Good SSB response, along with good solid filter terminations using the TIA stages. It appears that there is no AGC which may help the sound.
@andye2005
@andye2005 Ай бұрын
For your VCO zener, you can give it a bit more voltage by adding one of two normal silicon diodes in series. the usual diode voltage drop will jack up the zener and give you a bit more voltage. You can use the same method to increase the output of a 78L05 / 7805 regulator as well, put the diodes in the center pin that normally goes to ground. It might be enough to give you some idea if it is the VCO voltage is the problem. Of course a more direct approach would be to power the VCO from an external PSU if you have one available. Nice rx output so far...enjoying the series. Andy
@migalito1955
@migalito1955 Ай бұрын
Oh, check out Matthias Wandel's video on cheap Chinese test leads. They turned out to be magnetic & likely iron based wire having a copper color added on the surface.
@tcarney57
@tcarney57 Ай бұрын
From the "General Tips and Tricks" blurb for the P3ST kit: _Save yourself some troubleshooting grief later on: test every part before you install it. Though MDRF uses components only from reputable sources, even those have finite failure rates_ ." Amplify that by at least 30dB for parts from questionable sources. 😜
@2ftg
@2ftg Ай бұрын
This. The less reputable source it was, the more you need to test.
@johnwest7993
@johnwest7993 Ай бұрын
That's a very quiet rig.
@erikdevriese671
@erikdevriese671 Ай бұрын
Your rig sounds really great! I would like to study the schematic and see where it deviates from Farhan's designs. I have built several DC and regenerative receivers but I have no hands on experience with superheterodyne architecture and transmitters. Still, I would like to give it a try. Can you provide a link to the schematic? Thanks in advance! 73's from ON4ADV
@soldersmoke
@soldersmoke Ай бұрын
Erik: Sorry, but I don't have a schematic for this rig. It is taken from bits and pieces of other rigs. Much comes from the BITX 20 (see Farhan VU2ESE's schematic). The crystal filter was designed with G3UUR calculations and DISHAL software. The IF Amplifiers are TIAs -- see the article on this by Wes Hayward and Bob Kopci, using boards from Mostly DIY RF. The BP filter was designed with the help of an on-line calculator. The Power amplifier circuit is from Farhan's BITX 40 Module. The carrier oscillator and Product Detector/Balanced Modulator is from the BITX 20. The AF pre-amp is from the BITX20, the AF amp is a little LM386 board available on the internet. The mic amp is from Farhan's uBITX. Finally, the VFO is from an old Yaesu FT-101. So you see, it is mostly free-style homebrewing, with no schematic to guide the builder. Or, many different schematics! Much more info on the SolderSmokeblog. Search for Mythbuster. 73 Bill
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