NY4G - Ham Radio, QRP and Summits On The Air

Radio amateurs typically put in a 100 pF high voltage capacitor across the primary of an end fed half wave transformer.  I had the opportuni...

The key is stowed underneath the black steel spring plate on the right (above).   The battery is on the left side.  Below:  the phone is att...

  Thand to Bob Conder K4RLC for inviting me to present.   Dimitris Paliannis N1ED was the moderator and led the Q&A session.

The setup is as shown in the image below. The two antennas are arranged as inverted Vee in the same azimuthal orientation with the feedpoint...

https://owenduffy.net/blog/?p=12642   I wanted to record the URL for this important blog article by Owen Duffy on autotransformer 

 Measurements of the efficiency of the transformer cores have been made using the NanoVNA H4. The results are documented here: https://www.d...

 The URL is ny4gefhw.com Please take a tour and browse around.

The thirty meter band is such a "money band" for SOTA activations that it simply can't be ignored.  Traditional end fed half w...

 I was just going through reflection loss calculations and comparing efficient and inefficient transformers. On 60m, inefficient transformer...

 The "SOTA Package" antenna includes 30m and 60m.    Base antenna is a 40m half wave with a powerpole connector at the end for any...

  I have added both the 60m and 80m extensions to the system The 60 meter extension is particularly suited to the narrow allocation on 60m b...

  Generation 2 with the following improvements: Winder is separable from the transformer so it can be replaced if damaged or if one that is ...

Initial Prototype:  The initial prototype had a turns ratio of 14:2 (14 secondary and 2 primary).  It used a single 100 pF capacitor across ...

This DXpedition took place between late February and early March 2020 just before the pandemic hit with full force.  Because of the pandemic...