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HF Transceivers with more than 20 watts output

This is a brief introduction to HF RIGs I use or have used in the past. All information is 'work in progress' and
will be updated gradually.

The section also covers some of the less known HF RIGs. This does not mean that they may function sub-standard
(sometimes even to the contrary) but due to various reasons are not so familiar to the average HAM amateur.

This is motivation for me to promote these Rigs a little more on my website.

However, from my point of view, any future development for ham radio equipment will turn into the direction
of "SDR".

So, please consider your expenses if purchasing a new radio, with regard to that comment, for your own sake,
and visit my "SDRs" website.


Advice web page for "HF Newbies" see here.


New to the shack (August 2009):

Yaesu FT-450AT HF transceiver:

(NEW: hints for the FT-450 foot bar please see here)
The latest addition to my shack (after the Flex-3k) is the Yaesu FT-450AT. This is a substitute for my former Icom IC-7000,  
which I finally sold because of the felt inconveniance with it's menue system, which I never could get accustomed to.

The FT-450AT has a much, much simpler menue system. As per it's nature, I don't operate my /portable rigs too often
within a year, so the simplicity of the menue system for me plays a significant role as I don't want to dig into the manual
whenever I intend to operate the radio /p.

There have been quite a number of test reports on the FT-450, saying it's a "dog". However, my current findings on my
local antennas show, it's not really a "dog". Indeed, it performs pretty well on my antennas. Well, the built-in speaker
is rather poor re. audio quality, but this dramatically changes into "good" as soon as you connect a decent external
speaker into the back panel LS connector.

The transmitted TX audio is also quite ok when driving the rig with a Heil headset and HC-4 mike capsule. I have a rather
dark voice by nature and have chosen the HC-4 mike element in order to get more midths and heights in my TX audio
to be better readable if things are getting tight on the band. Running the rig in TX equalizer function set to "flat"
produces a real crisp and clean audio. If your particular voice is more high-pitched you should consider the HC-5 mike
element instead.

CW QSK is not so well implemented, it's a compromise, but works rather ok in semi-bk, which is ok for me, as I don't
run in CW QSK so much anyway.

The internal antenna tuner, although spec'd to tune a 3:1 SWR at max., in my case tunes my trapped dipole on 80m CW
down there in the CW band with a much higher SWR than 3:1.
Antenna tuner test: yesterday (03-Sep-2009), just for curiosity, I did a quick tuner test and I let the tuner try to match my
80/40/30m trap dipole on the the higher bands, where the antenna is not designed for (bad SWR). On every single band,
20/17/15/12 and 10m, the tuner did match the antenna to an SWR very close to or even equal to 1:1. As soon as I have
some more time, I will investigate this in more detail and update the findings right here.

The built-in speech memories (3 each 10 seconds) are great for recording your "CQ" call messages and save your voice
whenever running the rig in a contest. Very well done add-on included. The only complaint re. the set-up of this function
is the way of how you need to implement this. However, this is mainly true for a multi-OP environment.

For the price you need to pay for the rig it's a good first-time rig or a good back-up or /p rig.
At the time of my purchase (August 2009) the rig sold for Euro 599 w/o built-in antenna tuner and for Euro 699 with the
built-in tuner. I'd recommend to invest the extra 100 Euro and get the "AT" version with tuner.

I will put the rig through parts of the upcoming IARU Region-1 SSB fieldday and will report on the findings right here.

Update 05-Jan-2010:

Besides the September 2009 IARU Region-1 fieldday (see below) I've used the FT-450 during the DARC Xmas Contest 2009
in CW mode only (contest bands are 80 & 40m).

The rules for this contest are a bit strange, IMHO, as they are not seen in any other contest as far as my knowledge goes.
The calling station needs to QSY after his/her QSO to another QRG in order to start another CQ. This leads to a sort of
'messy' band as after a QSY the callers on average do not properly check if the new frequency is already in use or not.
This 'messiness' is augmented by the fact that the contest only lasts for 2 1/2 hours. A pretty limited time span causing
sort of a real hectic state in order to get as many as possible QSOs and multipiers logged in that time frame.

What happens is that somebody starts calling CQ on top of your QSO where you are just trying to receive your partner's
QSO exchange. Damn...

So, this contest, besides it's intrinsic 'craziness', is a real challenge to TRX/RX performance with main respect to the
RX capabilities. To take a positive view out of it, it gives you a profound feedback on the RX/TRX reception capabilities
within a very short time frame.

To make the story short:

With the FT-450, blocking or 3rd order IMD was not the issue. What was an issue was the fact that the minimum 500 Hz
DSP filter bandwidth (the most narrow bandwidth you can dial-in in CW with this transceiver) is just not good enough
(narrow enough) in order to deal with such a contest environment.

To deal with such a kind of environment would require a filter bandwidth (CW) of minimum 250 Hz, better down to
125 and narrower, in order to cope with the close-in QRM during this kind of a contest.

This is where the FT-450 gets 'out of steam'. Due to it's 500 Hz DSP filter it runs into 'problems' as soon as there are
multiple strong stations within that pass-band.

During this 'strange' contest I was able to 'rescue' a number of my QSOs and finish them with a 2-way QSO exchange
by tuning the 'Shift' control appropriately, which helped in many cases. However, I must say, that the IF DSP filtering
at 500 Hz minimum bandwidth is definitely not what makes you happy in such a case. It is more of the sort of 'offending'.

I am calling this 'offending' deliberately, because I believe Yaesu could do much better without significantly increased 
cost (if any, maybe just a DSP firmware upgrade) even with a radio in this class.

@Yaesu: if you are reading this: please reconsider your concept for the FT-450 CW RX DSP circuitry and/or firmware.

My 'wish list':

> implement a 250 Hz CW DSP filter (minimum, or narrower)
> implement a 5 KHZ (or narrower) roofing filter, forget the FM capability
> you may ask an additional amount of 50 to 100 Euros for these efforts
> that would put you well into the lead vs. your next competitor

Else: under standard rag-chewing QSOs (SSB and CW) the FT-450 is performing quite well. For the price you need to
pay for the TRX it makes the purchase of 2nd hand transceivers dated from the 80s or 90s almost obsolete.
Except if you are fond of those days' equipment (and *yes*, there are a few arguements coming with it).


Update 11-Dec-2009:

We've run the FT-450AT over several hours during the 2009 IARU Region-1 SSB fieldday. Operation was during the night
on 40 and 80m. The rig behaved astonishingly well under these circumstances. On these bands, the pre-amp needs to be
switched-off, for sure. In Yaesu language this means 'IPO on'!

Antennas in use were an 80m pyramide antenna and a 40m full-size vertical ground-mounted ontop of a 'chicken-mesh'
kind of rf ground system consisting of 2 'X' runs of 10m by 1m chicken-mesh ground system.

Performance both on 80m and 40m was exceptional! Power output was 100 watts.



to be continued...

 


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