Just a FYI: The fundamental frequency is actually referred to as the 'first' harmonic. By numbering harmonics this way it makes math calculations easier, and when everyone does the sequence numbering this way everyone knows what harmonic is being referred to.
Hi, congratulations for the succesful transformation of this old rig, it looks so nice. Could you please share the circuit schematics ? It is always interesting to find out how to solve circuit issues such as the final low pass filters. Saludos !! 73 CE3THK
Hello David, and thank you for your kind comments about the conversion. My Part 4 video has a view of both the VFO and the linear amplifier schematics. If you would like to see the transmitter original schematic, here is a link for that. hangarthirteen.org/wp-content/uploads/2020/08/16-40SCR274-5-Maintenance-Instructions-for-SCR-274-N.pdf You will also find the low pass filter kit I obtained from QRP Labs here. www.qrp-labs.com/lpfkit.html
Very useful video. I try to make a VFO like you but I have a very simple question: I can´t understand which terminal is the drain and which one is the source in the schematic (04:10 and so) ... can you help me? Thanks in advance from Buenos Aires - Argentina.
Hi Guillermo. I forgot to put the D and S in the schematic. Good catch! So looking at each FET, the "top" connection is the drain. The "bottom" is the source. I hope your project goes well. 73's
@@rfburns3472 Thank you sir! Then the three transistor are "drawing" on the same position in the schematic! Once again thak you for your kind and quick answer!
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Just a FYI: The fundamental frequency is actually referred to as the 'first' harmonic. By numbering harmonics this way it makes math calculations easier, and when everyone does the sequence numbering this way everyone knows what harmonic is being referred to.
Boy did I mispeak! Thanks John for kindly bringing that to my attention. I did a correcton using a subtitle in that segment of the video.
Hello, where did you source your MPF-102 transistors? Thanks, Dave , KJ7WT
They were OEM Motorola devices I purchased from www.expediters.com/
Hi, congratulations for the succesful transformation of this old rig, it looks so nice. Could you please share the circuit schematics ? It is always interesting to find out how to solve circuit issues such as the final low pass filters. Saludos !! 73 CE3THK
Hello David, and thank you for your kind comments about the conversion.
My Part 4 video has a view of both the VFO and the linear amplifier schematics.
If you would like to see the transmitter original schematic, here is a link for that.
hangarthirteen.org/wp-content/uploads/2020/08/16-40SCR274-5-Maintenance-Instructions-for-SCR-274-N.pdf
You will also find the low pass filter kit I obtained from QRP Labs here.
www.qrp-labs.com/lpfkit.html
Very useful video. I try to make a VFO like you but I have a very simple question: I can´t understand which terminal is the drain and which one is the source in the schematic (04:10 and so) ... can you help me? Thanks in advance from Buenos Aires - Argentina.
Hi Guillermo. I forgot to put the D and S in the schematic. Good catch!
So looking at each FET, the "top" connection is the drain. The "bottom" is the source.
I hope your project goes well. 73's
@@rfburns3472 Thank you sir! Then the three transistor are "drawing" on the same position in the schematic!
Once again thak you for your kind and quick answer!
@@gfpaulosky 👍Welcome!