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Bill, Please excuse the intrusion; I don't wish to hijack the thread, but I have always found using a scope to be reasonably accurate from the bench. (I realize you may be wanting to do so in the

Ian, What a great project. Thanks for sharing! If you have 40-50db of opposite sideband rejection, I'd say you don't have any more work to do. That's excellent performance. I am curious about the way

Nick, Thanks for the heads up on that article. That, and EMRFD that was recommended, confirmed what I'd suspected: a basic diode detector, properly built and applied, can be a very accurate measure of

Hi Jerry Sorry for the late reply. I've been fixing bugs and investigating your question. I don't have an easy way of determining the side-band rejection, but on receive and listening to an S9 signal

Perhaps some one on the list has one excess to their needs.? ?My email address is Ki6ds1[@]gmail.com Remove the brackets to email. Thanks, Doug

I am new to HF / new to QRP / with a new BITX40 finally finished after sitting in the box forever Ron N7RDE

I like the BAV21, which is a high voltage, small signal diode. I built a wattmeter from an article by W8TEE and AC8GY in QST of November, 2018. It's an Arduino based project. I didn't build their

Ordered another set of 10 boards.? Here is what I get billed for. Subtotal: ? ? ? ? ?? $ 5.00 Shipping Cost: ? ? ? $ 6.34 Paypal Fee ? ? ? ? ? $ 1.17 Duty & Tax:vat help? $ 8.00 All

Mike, thanks for bringing that to our attention.? It solves a problem for the 40m SST.? It uses 4.000MHz x 4 crystals for the IF and BFOs and 11.046MHz for the VXO.? By using two 11.059MHz, which

This is an interesting paper on the NorCal site about VXO pulling, written by Wayne, NB6M. https://www.norcalqrp.org/nb6mvxo.htm [email protected]> wrote:

Steve Great info. My mind still aches from understanding low phase noise stuff from working with oscillator geeks. In a mere vxo for ham radio, well at least per W1FB experiments (or someone's he

Been on 17m for 6.5 weeks now and you can see my results thus far in the signature block.? Using a QRP-Labs QCX-mini at 4.2W with a one element beam (sounds better than a dual hamstick dipole) at 4m.

1n4007 100 watts. Without doing math or looking at datasheet. No. W7zoi showed how to build high power attenuators in that article. Do you really care if whatever makes 94 or 106 watts before you go

Low Q inductors have a drawback when used in oscillators: Phase noise If you are designing a simple radio, then this might not be of much concern. However if you are designing a more complicated

Good stuff, yes the constraining math of quartz acoustics. We are blessed by its unique properties and having lots of quartz material. It's the scarcity of manufacturing. Similar acoustic behavior

Chuck et al : FWIW, I extended the tuning range of one of my 20m W8DIZ One-Watters by paralleling a second crystal of the same value in the oscillator. This idea is sometimes referred to as an SVXO or

Also for a VXO using a low Q inductor can slightly increase the tuning range. Any it's worth trying. Of course we all appreciated the era of low cost kits. The stars were norcal, njqrp, neqrp and the

<https://archive.org/details/introductory.electronic.devices.and.circuits.6th-robert.t.paynter/page/763/mode/2up> Most Colpitts designs I see hams use have the capacitor divider network with two equal

Yes, we wanted to save money

Forgot. Note, in the SST, Wayne went with molded inductors.? When NorCal did this (and Doug can verify) I'll bet that molded inductors were much cheaper than toroids. They do heat up as a side note.