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Tony, based on my interpretation of the circuit (and the description of how you use it on your web page), I assume it's not absolutely necessary to find a 400KHz resonator, and a 420KHz or 455KHz

Hi Chuck, The boards like they are well traveled! Just hope who ever receives the board can make their signal to follow the route the boards took. 72 Ron WB3AAL

OK.? My bad.? That is the circumference of the Earth, not the diameter. We have not been moved to giant planet.? :-) chuck, k7qo

I hope this never happens to you. Good news.? DHL found my two board sets in the package.? :-) Bad news.??? DHL is taking them around the world.? :-( Two different projects on PCBs from

In order to accommodate Doug's desire to get boards made for this simple project I've placed the gerber files on my blog and this link will take you to the right spot on the

there are other numbers in 1SV series like 1sb103 etc.? I saw them being used on FT-77 of 1980s. Perhaps some sellers on ebay or ali express might be sellin even now as NOSall the bestsarma?vu3zmv

Hi there, I know the norcal40A is the new black, and I'm with you on that...but I am also working on a Manhattan style 2N2 40+ at the moment. the 11/23/2003 BoM lists 3 different varacters. D9,10

chuck adams writes: The above links worked OK for me, Chuck. 73, Paul NA5N

Jim Kortge writes: ... and the crystal parameters from my web page that I measured a long time ago, it looks like a 500 Hz Cohn filter can be made. Thanks, Jim, for running the analysis (and

Thanks for that John. i went back and read your Build description, excellent reading. Very witty actually. i always think of stuff like that after I've posted.... keep up the good work. 73 Alun

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. *File:* 13.5MHzFilter-500HzBW-Schematic.pdf *Uploaded

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. *File:* 13.5MHzFilter-500HzBW-Response.pdf *Uploaded

Mike et. al., I just ran a design using the Goldmine Electronics 13.5 MHz crystals that Chuck sent to me many, many moons ago. Using the AADE Filter program and the crystal parameters from my web

I am using a 1SV149 on my production PCB. I'm getting almost 44KHz tuning range. I was using a 1N4007 before that getting 33.5KHz. John Sutter W1JDS CM87xi

I ordered some PCB's for the NORCAL40 and have set aside enough for my tinkering and have found a home for few with local interested builders which leaves me with three more to find homes for. So, as

OK, the last did not work either as Jim, K8IQY, pointed out. I edited the URLs and reposted using my email browser.? Guess there was some embedded critter lurking.? Let's try this one more time for

Hi all, I was intending to substitute a 1SV149 (www.qsl.net/df7tv/datasheets/1SV149.pdf) for the MVAM108. www.mouser.com/ds/2/453/mvam108-838374.pdf The 1sv149 is listed as a substitute for the

I am running a 1n4007 in mine, works great. I am using Chuck's crystals so my VFO is at 2.9mHz but I get 60KHz range out of it. Don't think it is as stable as Chuck's but I tested from cold room start

Same happened to me. Rahul VU3WJM

To answer Tony's question about the richness of the harmonics and the pulse width, I would say that it's the edge rate of the output, and not the pulse width. After all, a perfect square wave will