Видео

To change frequency use a LC tank circuit and diode varactor capacitor with a 10 turn vernier potentiometer with built in turns counter to tune by changing the reverse bias dc voltage of the varactor diode. Much smaller than a variable air capacitor or a variable permeability tuning coil. Works well for me ! 😇

Such a hack radio. Seems to perform very well....

Bill, thanks for posting your video, I can clearly see the layout of your regen now. That is what I needed to get started on building my version of this receiver. 73 OM

Are you going to start portable operating? G7VFY

My Grandpa had a S-38 receiver just like that. My brother had it restored from a member of his club. Knowing all of the knowledge that I know now from the SolderSmoke podcast, I may have to inspect his work!

The S-38E has a sad optimism about it, like a rescue puppy or Charlie Brown's Christmas tree. It knows how close it was to being thrown into outer darkness (the landfill) and its gratitude shows.

Love the radioshack portable receiver. I have a similar one (DX392) with cassette. Pretty good radio I bought in 93 and still works.

Love an operating station with a view to the horizon where DX is waiting.

Hey Bill, looking good! Question - what percentage of night time there will allow for sky gazing? And, being so close to the eastern end of the island does KP4 land usually take the brunt of any westward moving big storms and take the "heat" off of the Dominican Republic? Enjoy your time in the southern CP! 73 - Dino KLØS

Fantastic! Thanks for sharing!

Very cool station and a big thumbs up for your HW-8. Love the location 🙂 73 de wa4jat

Very, very cool!!!!, I have only been licensed about 11months,(did the foundation intermediate then full within a few weeks of each other, best thing I ever done!!)i love your videos, I'm designing and building all my own gear, I've got a really cool "ammo tin lunch box"to build a portable HF rig in, I'll send you a photo when it's done, anyway thanks for keeping the homebrew art alive and especially for promoting it!!, you're a legend!!73s from the UK -scott M0KJZ

Looking good Bill! 73 - Dino KLØS

Exiting!

A very cozy yet bright shack. In addition to the Starlink, what other antennas do/will you have on the roof? From that high and open vantage point, I'll bet a mag-loop would work very well on that outside balcony--with a remotely-controlled vacuum capacitor (or even a high-voltage air variable) to tune it. Having to tune it every-few KHz is a PITA, but OTOH it serves as its own (very narrow) BPF. --K7TFC

Hi Grayson, I like thermatrons since I was younger from the 60's - 73 de IV3GFN - Pino

3

What about QSE and QSD modules (Quadrature Sampling Emitter & Quadrature Sampling Detector)

Thanks for posting these conversational videos. They were interesting, fun and imparted a lot of knowledge. Thanks all for taking the time to make them, especially as your time with Farhan must be limited. 👍 73 G0ACE

I have wanted to use JS8 because of its advanced tracking (when I'm traveling in very remote places). Look up KD6XU and see where he is with tracking. That is JS8 ! With my 7300 I'm far more worried about the lack of balance in certain mixers and no way to adjust out the carrier. Maybe I'm guilty of using a microscope there ?

Too Short . zBITX , cool, but I doubt you'll sell it ? I haven't really applied myself but I need to get the sBITX working with JS8 and need the audio files names for settings. For some reason I could't tell which one is used for ft8 and use that one. Not applying myself maybe. I think I could hike with it.

Hi dave Couldn't help but notice a weird knob there on the VFO. I see you are turning the knob and the shaft barely moving. Is there a reduction drive built in the back of that knob? and how is is not turning with the knob? plz explain

I'm very happy to find this. I have the same radio and it's sitting doing nothing. I'm so glad I hoarded this thing for the past 45 years! I can't wait to dig in. Charles - NK8O

Farhan has such a wealth of knowledge and innovation, he is a real gift to the community.

Enjoyed the discussions. Yes, IMD is cumulative.. so one has to look at every stage.. About 6 dB difference in IP3 figures between each stage should keep IMD down to a manageable level. The envelope restoration techniques for SSB seem to go back to the 50s.

Cool beans, guys. I still aim to build your direct conversion receiver. I only at the moment have & had internet via cellular service at a limited speed & its a bit iffy at best. This has slowed me down, but hope is in sight for good internet service in this very remote area of the Catskil Mountains of NY. In rhe mean time I have under construction a regenerative receiver to replace the one I built 15 years ago on a pine board using copper brad nails as the solder points for the components. It was surprisingly decent for a first time ever receiver, but I really want to understand the method of receive via direct conversion, hence it is on my list for sure. Always enjoy your chats.....

I know how to finalize my finals now..finally, thank you!!

It strikes me that you don't need dry ice for a cloud chamber, some stacked Peltier devices might get you cool enough.

Nice Bill! How was the performance before the resistor swap? 73 de PA1DSP

Love the dial 😂

love it! 73

So Bill, was the error only on your Schematic, or did you actually have a 2.7 ohm resistor wired in? 73 - Rick - N3FJZ

Sounding good!

You’re an RF wizard Bill. I’m always amazed with what you build.

Those capacitors may be a axial Tantalum (either wet or dry) Sounds like leakage. Try measuring with a series resistor such as 10 -100k. Apply a suitable DC voltage across both. Measure DC across the resistor with applied voltage and you should measure nothing, after a short period of time. (perhaps 1 minute) If there is substantial leakage, it may be a bad batch.

what about using 3x12AX7 vacuum tubes as a Cross Coupled Double Balanced Mixer which should work as a modulator with gain and should work as a demodulator again with gain with a B+ of 50V and a Heater voltage of 12V, if you want a look then here it is Angelfire/Double Balanced Mixer using vacuum tubes

What about Varicap diodes and a large value Multi-Turn pot to give a nice wide tuning capability.

What about using VN66AF VMOSFETS for the output stage.

What about a 10 Turn multi-turn pot.

Just wondering if you could get new old stock SO42P chips for up/down conversion.

You built that radio. Respect.

Those are some rare, precious POLYSTYRENE caps you got there. You can only get them secondhand now. Great for ham radio projects but not necessarily to replace electrolytics ;) The different capacitor types each have different specifications, different pros/cons, that's why they make them out of different materials. I'm really not shocked your polystyrene caps didn't make good electrolytics.

It's cool the TIA amps can be recognized on sight, hand-built or otherwise. I think it's the trinity of 3904s that is the give-away. A few other thoughts: 1) Pete has a method for setting the bias on the final MOSFET by looking at a sample of the actual final-amp output rather than shooting for a particular gate voltage/drain current. I haven' t tried it myself, but it makes sense to look directly at the results and set the bias accordingly. 2) Regarding the need for shielding, I think much has to do with a person's particular RF/EMI environment. Apartment dwellers can't control most of the digital and impulse noise that sometimes floods in from the ever-growing number of noise sources. Also in my case, I have three 100KW FM towers glaring down on me from Portland's west hills, and I can hear one of them--KINK 102 (yes, that's its real call)--with just a little wire on the input pin of an LM386. I don't know how it's being discriminated, but I can hear it. Unrelated to that, my RX noise floor is around S5 on 20M, with gusts up to S7. It's pretty damn noisy around here. I've got to keep circuits pretty buttoned up to keep that out (and a deep FM notch filter on the antenna feedline), and to keep out the noise from the upstairs-neighbor's digitally-controlled (why?) washing machine. Anyway, in addition to definite need in my case, I'm rather fond of prophylaxis. I take a low-dose aspirin every day, and I also use a lot of that copper shielding tape. --K7TFC

Nice build Bill. I noticed there are a couple of those Kemet caps laying on the audio amp and the crystal filter. Watch out for those! 73, Ian, VK7IAN

Hi Bill! Thanks for watching the video of my 15:10 rig and it's great to see yours. You're absolutely right about space - I had to shoe-horn everything in to what for me is quite a small enclosure. I much prefer the large metal bread bins that have housed at least a couple of my creations or even the plain wooden board of the Shelf-17. But having set myself a challenge I was determined to rise to it. My main concern was how the modules would interact with one another and I feared for amplifiers turning into oscillators. In the end it all worked pretty well. All I need now is for conditions to improve so I can really start working some DX on 10W! Thanks again. 73, Nick M0NTV

Hi Bill. Nice work. Sadly I'm not doing it anymore I'm just too old. Hope you have a great time using it. 73. Paul. De HS0ZLQ, G0MIH.

I'm impressed you made all three _radios rusticas_ the same width. Standard 19" rack?

well done well done very very great This is good amateur radio.🙏

Nice build! Audio is great.

Nice sounding rig!