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A common 50 Ohm input impedance amplifier design evaluation: https://www.kn5l.net/rf-amp/ Wayne has used this design for RF amps in K3, KX3, KX2, and K2. And K2 post mixer amplifier. There are other

it is 100 x 100 mm lz7dp, dim

NORCAL is it within 10 x 100mm? [email protected]> wrote:

Will be cheaper to order 5 pcs with gerber files (in groups.io)? from China (with DHL shipping, for 5$ all). lz7dp, Dim

Belay this request. It was a cockpit error. Somehow I tinked with the Wn (weighting) command and it through off the whole magillah. Now don;t I feel the fool? Things are back to normal now. --

My NorCal 40A (Wilderness Radio version) has become sick and I am wondering if there's a way to do a reset/reboot. The code speed is stuck at 25 WPM irrespective of the speed pot setting -- full CCW

Also, open short method is for a conventional two winding transformer. Unun demonstrated is an auto-transformer. It is impossible to fabricate a matching two winding transformer with same k value as

Hi Steve, I've tried measuring k near one using inductance measurements with limited success. Confirming SimSmith matches inductance measurements is a good question.

Wow that k value is excellent. Can you confirm with open/short test just to verify that actual measurement is in agreement with the Sim Smith model? Thanks

Hi Steve, This Unun design uses winding to winding capacitance for leakage inductance compensation. Capacitance to leakage inductance ratio tuned by moving primary windings within secondary windings,

Hi John. That UNUN appears to have very good performance without the need for a capacitor across the primary as used in many commercial units. That implies to me that it has relatively low leakage

One simple method you could use if maximum power transfer isn't a must would be to shunt the output of the mixer with 50 ohms to ground. You could always make up audio gain. 73- Nick, WA5BDU wrote:

Hi Allison https://www.kn5l.net/kn5lEfhwUnun/ Look under the title: "Antenna Measurement." John KN5L

Eznec rarely get the ground effects right. You need Nec4.2 engine to model that correctly. too many years of modeling in the office and then going out on the grass and finding out they dont match

Hi Allison, I'm somewhat confused by your response. https://www.kn5l.net/kn5lEfhwUnun/ A Unun ratio was selected for a specific test antenna. An EZNEC model, which matches test antenna dimensions, is

Rick Campbell KK7B designed a series of direct conversion radios with 50 ohm audio amps. See this link for details. May be some ideas you can use in yours. They work very well.

John, For matching a EFHW its important to know that while there are all manner of magic ratios the actual feed point resistance is the only real one. That varies with height and orientation. The

This is very helpful, thank you

THe most common is one of two... Transformer from 50 ohms to say 500-100 ohms to match the base of a transistor. The problem with that is bandwidth as its a poor match across the DC to many mghz of

It's fairly important that the DBM see 50 Ohms. The master for matching these product detectors to the audio chain is Rick Campbell KK7B who designed the R1, R2, miniR2 and microR2 receivers among