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I have been breadboarding using solderless breadboards and preformed jumper wires.? I can buy protoboards that have the same hole pattern for more permanent applications.? However, when I move the

I'll see if I can google around and find the article again. Tom, wb6b

Not the ceramic ones, you get xtal ones.. a little pricy but sharp stopbands. Basic ones are 7.5 KHz, I am sure wider ones are there. Probably in 21.4MHz.

Raj, I evaluated a few 10.7 mhz fm filters. Their stop-band rejection was hardly 50 dB, not enough for HF radio. Btw, the sbitx scheme does not stop using a narrow cw crystal filter. The entire IF

Farhan, Use a 10.7 filter! Raj

I added a new section called "sBITX" to the groups.io WIKI with the info David suggested. -- 73 Bob? KD8CGH

i forgot the attachments. hopefully they appear now.

hello friends. i hope it is ok to post this here. i made a linear amplifier, similar to wa2eby. basically two amps running in anti phase. maybe it may be helpful to someone who wants to boost the

That's a great idea :) If you don't need as fast of response in your oven, maybe you could leave the envelope on. The oven light might be able to do double duty as a light when you open the door, and

Shirley, given that we are looking for a wide bandwidth, we wouldn't need much of matching. I just took the first eight off the smd strip and they worked!

I think we are addressing multiple topics now. The paradigm of the small loop versus a longer length of wire as a receive only antenna. For the latter wire diameter less critical. Simian don't be

I was eyeing those 40 MHz fundamental mode crystals that you can buy from Digi-Key and Mouser. The prices are reasonable, under 30 cents. Looks like you've now done some of the work to try them out. I

David? At 11 MHz, it is difficult to build a 10 khz filter without desoldering all the caps and the matching transformers. However, if you are okay with the 3 Khz bandwidth, then it can be

Couldn't sBITX do a 10kHz wide window with a relatively unmodified uBITX without the 27MHz or 40MHz IF mods?

Perhaps a README.md file like this would be good for the repository: # sBITX -- An open source SDR that you can hack See these resources for more information: *

I am reassigning pins to simplify the pcb layout. So, please hold on for a week (until I get my pcbs) before starting to make the sbitx. I also managed a 30 khz wide filter on 40 mhz (whoa!) Which

The https://www.youtube.com/watch?v=9mFxyS6_2t8 video, the https://tinyurl.com/5xn7v22a link to the googledoc presentation materials and the https://github.com/afarhan/sbitx repository, with the code

Interesting. Most metals have about the same temperature coefficient of resistivity as

Hi Gerald I have built a somewhat similar loop with 2.6m of half inch heliax and a very small capacitor (5pf to 40pf), aiming the top bands. The problem is that tuning is very, very sensitive in that

Yes, that is one of my favorite you-tubers. I like how he used crushed light bulbs as a cathode in his spectrometer. I have a surplus Pirani vacuum gauge that I'm using now, but am interested in