Holy Cow! Random Wire Calculations Made Easy!

 

TenTecR4030

Been hacking around lately looking for more fun antenna projects to do with my QRP rigs.

In the meantime, I’ve been having a blast with this old Ten-Tec R4030 which I recently picked up.

I’ts been quite awhile since I have been experimenting with QRP antennas or been in the mood to build stuff but lately I have been doing a bit both for some odd reason…

Anyway, to avoid boring you to death with my idiosyncrasies, I have been reading a lot about theory of UNUN’s, random wire lengths and other weird combos or for the nerdy ham in me.

In doing so,  IMHO I found a rather priceless article on random wire lengths.  One of the keywords on the page which lends itself to my idiosyncrasies is UNORTHODOX.  Perhaps you will get out of this article as much as I did. (Yup, I even compiled and ran the C Code on my Raspberry PI!)

The Article is titled Random Wire Antennas. 72 and Enjoy de KE2YK

 

 

 

 

 

Quick Review of the QYT KT8900D Mobile

QYT KT8900D Mobile RadioBought a QYT KT8900D (upgraded 2nd gen.) Quad Band receive Dual Band (2 m / 70 cm) transmit mobile radio the other day. Why? I don’t know. Just wanted to see what these Chinese radios are like these days I suppose. I am not using the radio mobile so I am not concerned with the lack of image rejection or other quirks encountered when driving around dense RF fields. If you plan to drive near or in a city, IMHO forget it, this is not the radio for you!

Worked a local 70 cm repeater with it the other day and received a good audio report from several guys.  Guess that’s a promising sign for an inexpensive mobile radio.

Taking the easy way out, I loaded up the frequencies I wanted using CHIRP since I have a subscription to Radio Reference. Once I had the Ham Repeaters, Fire and Ambulance info loaded, I then downloaded the contents of the radio into the factory software.

If you plan to use CHIRP as I did, be sure to follow up with the factory software since it offers a whole bunch of settings in the Options panel not available at all in CHIRP. You will find that the factory software Chinglish conversion good enough to understand  99% of the setup.

The factory software does not seem to permit setting up the radio with name only as a default for the display. As a result, after each upload of the code plug, you do have to manually step through the display if you want to change each of the four displayed frequencies over to names. Accomplishing this is done by hitting the ABCD key and then the V/M key on the front panel.

When the radio is power cycled, the names are displayed. If resetting to names was required during each power cycle the radio would have been returned.

For an $85, knock-around ham shack radio the QYT KT8900D appears to be a good buy.  Should I run into additional issues I will post them here in the future.

Want to know more, visit this link at Amazon.

73 Gary KE2YK

 

Drake SPR-4 Receiver SOLD!

I am selling a solid state Drake Receiver and Original Manual. To my knowledge, the radio is in good working condition. Cosmetically the radio is clean (minus the dust) as the photos will show.

The radio has the crystal calibrator and Noise Blanker installed. The crystal bank is fully loaded.  To my knowledge the radio works on all bands. The incandescent bulb is out behind the pre-selector and S meter indicators.  The original owner placed a plastic strip of frequencies along the front of the top cover as you will see in the photos.
An inquiry was recently made regarding the purpose of the threaded holes in both sides of the cabinet. I don’t know the reason for them but it is part of the original cabinet when manufactured. I verified that by looking at the cover of the manual and viewing an SPR-4 demo video on youtube.
Buyer pays for UPS packing, shipping and insurance.  PayPal preferred but USPS money order accepted.

If you are interested, make me an offer by email at ke2yk48 at gmail dot com

Here are the what you see is what you get photos. Dusty cover included in price!

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