This note for TS-990s geeks who are running WinMail and RMS Express.
It is natural to use the Data menu item in position one for Voice (via microphone). On-screen, this will show as “USB”, top left of the monitor. Upon holding the button “Data” for a second or two, you can confirm that the microphone is selected for this position.
Demo of RMS Express at bottom of this article
In the event that you use RMS Express with a TS-990s, Continue reading
The diagrams included in this article were modelled with a program called MMANA. If you are inclined to give this a go, its a free download and I have produced training films on YouTube.
NOTE: I have intentionally modelled the vertical antenna with a bad ground to replicate the findings of some fibreglass yacht owners who run a 15 to 20 foot copper ground strap to Dynaplates. I have modelled the horizontal antennas over sea-water.
This article follows my paper on raised feedpoint vertical SSB antennas for fibreglass boats. In this article, I look at an alternative; a horizontal dipole antenna which I will call an offset doublet and a Mk2 version, with a vertical component at the rear. We will continue to use the ATU matching device (often supplied by Icom) which will remove all the hassle of mono-banding and tuning. Marine SSB relies on a number of frequencies so an ATU to dial out the mismatch is vital.
This article discusses in layman’s terms how an antenna transmits its energy and the various factors that might affect its performance. The target audience is Foundation students and marine sailors since I discuss the positive impact of the sea as a ground, particularly those sailors with fibreglass boats who have vertical antennas mounted up high off the waterline. This debate started in the Yahoo Group, NordhavnDreamers.
Dipoles and Vertical Antennas
Coax showing centre-conductor and ground / braid surrounding
The energy from your transmitter is sent via its coaxial cable and connects to the “feedpoint” of your antenna which will radiate electromagnetic energy. Most modern transceivers expect to “see” a 50 ohm load at the point where the coax connects to the transmitter. It’s this reason why coax cable suited for transmissions is more often than not quoted as 50 ohm cable.
Antennas are a little bit like piano strings. If all the piano strings were set at the same tension, the longer strings would play a lower note and the shorter strings will play a higher note.
I finally took delivery of my TS990s in early January 2014 and it came with the latest firmware from the factory. First impressions, distilled into single words: massive, engineered, beautiful, functional, imposing, radio bling. But not a microphone in sight which I thought was pretty odd but they must have got their sums right, I would never had used a cheap mic on this wonderful radio anyway since I use a stick mic on a table boom (Heil Goldline) but it would have been good to check without making up a cable.
Everything about this rig is solid. My expectations had been managed by all the articles that I’ve read on the internet about the radio and I double checked the radio when I compared both the FTdx5000MP and the TS-990s at the RSGB convention in late 2013. For me, the TS-990s was the winner, although more expensive. The main reason for switching my allegiance from Yaesu was the size (I like very large radios), the in-built monitor and scope function, and particularly the fact that a single USB cable connects the rig to my WIndows 7 PC, effectively de-cluttering my MK2R+ SO2R system. I was fed up with all the wires everywhere. Continue reading