Author Archives: dcasler

IC-7300 Firmware Update Charts

Posted on February 28, 2021 by dcasler

Here are the charts from Ask Dave 378 about updating the firmware on the Icom IC-7300. The charts can be found (PDF) by clicking here. Here’s the video:

Posted in Ask Dave | 2 Comments

Derivation of the 468 over f formula for the length of a dipole

Posted on January 30, 2021 by dcasler

Per request from KEØKRO, here is the chart showing the derivation of the formula that the length in feet of a dipole is 468 divided by the frequency in Megahertz. Also, you can go here for a higher resolution PDF … Continue reading →

Posted in Ask Dave | Tagged , , | 3 Comments

KE0OG Health Update

Posted on November 15, 2020 by dcasler

Still recovering from bad episode of gastroinstestinal bleeding. Very anemic at the moment, on oxygen, at home, but trying to walk more than 10 feet leaves me exhausted and completely out of breath. Had 3 units of blood last week. … Continue reading →

Posted in Ham Radio blog entries | 68 Comments

My QST Article, “Exploring Radio Mathematics”

Posted on October 14, 2020 by dcasler

My article on exploring radio mathematics was just published in the November issue of QST. Unfortunately errors crept in, which has generated lots of emails. I put together a page on my website that collects and collates the errors. Check … Continue reading →

Posted in Ham Radio blog entries | Tagged , | 1 Comment

Unusual J-pole Antenna (Ask Dave 302)

Posted on September 22, 2020 by dcasler

Here’s the drawing that goes with Ask Dave 302. Click here to get the pdf.

Posted in Ham Radio blog entries | Tagged , | 2 Comments

Website for info about DSTAR

Posted on July 12, 2020 by dcasler

Brad Rich provides this link for those wishing to learn more about DSTAR. Note it not only has lots of good info, but lists other links as well. Here is the link; you can just click on it to go … Continue reading →

Posted in Ask Dave, Ham Radio blog entries | Tagged | Leave a comment

Oggie Harry Rundall, AC3EK, Discusses Elbow Connectors

Posted on June 23, 2020 by dcasler

Harry reports: “I had asked about erratic power behavior on the ICOM 7300 on the mode FT8 last Saturdays Q&A. Well it turns out it was the elbow connector I had in line on the back of the rig to … Continue reading →

Posted in Ham Radio blog entries | 3 Comments

MFJ-17754 Instruction Addendum from Ask Dave 265 and 266

Posted on April 17, 2020 by dcasler

In Ask Dave 265 and Ask Dave 266, I mentioned an Addendum to the MFJ instructions. This addendum describes that the antenna comes pretuned too long and will need to be shortened, and gives instructions for doing so. See the … Continue reading →

Posted in Ask Dave | 1 Comment

Reference Station Page Now Active

Posted on April 6, 2020 by dcasler

I’ve put up a page that takes you to the Reference Station list of equipment. It’s at www.dcasler.com/reference. Check it out. Comments should go to the video that introduces the reference station component.

Posted in Ask Dave | 7 Comments

Ideal Stripmaster Wire Stripping Tool

Posted on March 28, 2020 by dcasler

In today’s livestream, I promised to put up a link to my wire stripper. They’re a bit expensive, but I don’t know how I ever lived without it! Note: if you purchase through this link, you’re helping to support my … Continue reading →

Posted in Ask Dave, Ham Radio blog entries | 5 Comments