It was only a matter of time before fake FTDI RS232-USB adapter chips began to appear. http://zeptobars.ru/en/read/FTDI-FT232RL-real-vs-fake-supereal This fascinating page shows how some anonymous Chinese company has created a fake FT232RL chip using a mask-programmable microcontroller, and printed it with the “FTDI” name and logo. Like Prolific (the real Prolific […]
Technical Topics
19 posts
Assemble the red and black plastic housings together correctly on the first try, they fit snugly and can be difficult to get apart. See the picture below for ARES /RACES standard orientation. Note that you can assemble the red and black insulated housings in other ways for special applications. Put […]
The PDF file OrionBandData which has AD5X design for a encoder which takes the band data output of an Orion and converts to proper levels the BCD data needed to band switching of Yaesu as well as ICOM amplifiers. Thanks to AD5X for the design. Download here.
The antenna changeover relay on most linear amplifiers is rather slow, and when the transceiver keys it, there is an RF spark because the RF power appears before the relay has fully changed over. Many modern transceivers provide a delay of 10 – 15 ms between key-down – or pressing […]
Reject unwanted MW AM signals from your RX Front End A nearby broadcast AM station in the Medium Wave band can sometimes cause interference to HF receivers over a broad range of frequencies. A band-stop filter can reject the unwanted frequencies and keep them out of your receiver. This design […]
The KD9SV Front End Saver in a new fashion. If you use a separate receive antenna, you need a Front End Saver to eliminate the possibility of blowing out your receiver’s front end while using an auxiliary receive antenna. Unfortunately, all the radios produced by Icom, Kenwood, Yaesu & TenTec […]
Mario, S56A, developed many state-of-art SO2R devices. Look at these hi-tech units! S3O2R – S56A Simple Single Op. Two Radio Interface by Marijan Miletic, S56A, N1YU SO2R category is becoming very popular in HF contests. Several PC programs support operation via LPT and COM ports. Commercial switching boxes were recently […]
Why this reprint? You may get some goals here: Download PC boards ready to foil print Download complete data sheet of the relay used Get more construction details This reprint is made under kindly permission of the author, Thomas Moliere, DL7AV [reprinted from the CQ Contest November 1998, p. 8-13] […]
Hipersil, what’s behind? by Will Matney I was asked about a transformer using nothing but a Hipersil transformer. I offered an EI type, M6 material transformer of the same specs, but it wouldn’t do. Well folks, this gave way to me writing this for all on what exactly is […]