AM TX Settings
Here are the tips that I have received from on the air tests. Of course
if your microphone or voice is much different than mine, there may need
to be some different audio settings.
I use the Yaesu Dynamic Microphone MD-100a8x. Dynamic low impedance
mikes are less prone to rf getting into them by the way, as compared to
condenser and high impedance mikes. Normally I run this mike with out
using any of the audio tailoring options switch able on the bottom of the
mike base. However in the AM mode, it was suggested that I run this mike
with the High Emphasis enabled, and low cut off. It works good for me
this way in AM mode, but I have all these options by passed for ssb
(thru switch setting).
Turn off the mike processor, and set audio gain where you normally use
it for sideband (11-12 o'clock or so?) Adjust the Rf power output to no
more than 25 watts. Speak into the mike and adjust the Rf for the best
output where the rf output meter doesn't show any downward swings. A
slight wiggle is ok, but no downward dippings as you speak. If it does,
your audio will be muddy and poor quality. Be careful of the AM tube
operators that speak of upward modulation settings. For them on the tube
circuits that support it, that is very desirable .... you cant adjust
the MP for that anyway.
I found that making adjustments a few inches from the mike is best, but
be careful to not get to close to the mike after you make your settings,
or you will see the dipping. It is easier to speak lower and quieter in
the AM mode and still have good audio, than in ssb where we speak up to
keep the meter output readings peaking You can experiment with the EDSP
on and off for audio checks. I have my menu 4-4 Tx Audio Edsp set to 3.
With the EDSP button by the Contour knob off, my audio is crisper. With
it on, I have a fuller sound. To those that have a good S meter reading
on me compared to their noise, some like the Edsp on during Tx. For
those that I am weaker to, of course they like the better
intelligibility of the Edsp off.
Menu 5-9 Tx Edsp Filter 6.0 kHz / 2.0 kHz makes no difference in the AM
mode. I have mine set to 2.4 for use in Ssb though.... at least until
the Fcc says it is ok to run 6 kHz wide transmitted single side band. I
have heard rumors that they might start ticketing those that are running
6 kHz ..... some OO's are now sending warnings to those that they hear
operating this way.
One guy says he limits his MP rf output to 10 watts and feeds an
external linear amp for a couple hundred to four hundred watts.... he
sounded great in AM mode! He also runs the Yaesu Dynamic Microphone
MD-100a8x. Because of the power output and class A audio difference with
the MkV, and its different way of setting filter characteristics, I
don't know what the settings are there.... I would suspect that 50 watts
would be the output setting area, class A audio, and the rest about the
For the Field model of the 1000, I would expect the same as the MkV
except back to the 25 watt output level as the MP.
I would be interested in hearing from others that have worked that out
for those two rigs.
73 from Bill - WD8ARZ
Further Commentary on HF Audio:
Here is a partial review of the various aspects of hf transmitted audio
so as to reduce the confusion between personal choices vs performance.
This applies to all radios, and not just to FT1000MP. I am also
specifically meaning SSB or AM audio and not FM. I am also ignoring
overall power output, but comparing the same signal under different
There are various exceptions to parts of what is discussed here, there
always are. Please keep in mind the over all objective and points being
made, and not getting lost in the exceptions, if, than and buts....thank
you in advance.
How audio "sounds" is greatly affected by what method is being used to
"hear" it. I am ignoring the differences between speakers, headphones,
internal vs. external, etc. But those do make a over all big difference,
especially to reduce listening fatigue. What I am referring to is
whither your listening to your self through the monitor mode, your
asking a local within a couple of miles of you, a local less than 50
miles, one between 100 and 300 miles, one more than a thousand miles
away, and band conditions at the time of the check. Band conditions are
QRM, QRN, fading, and weak or strong signal conditions. Lets not forget
that the person receiving your audio also has adjustments that make a
difference, not to mention his/her own ear performance (did I mention
attitude?? hi hi).
It is human nature to want to hear the best possible audio and for it to
be as natural as possible, if the bandwidth allows it. However what
sounds "good" and what is intelligible are not the same things. By
intelligible I mean the ability for your spoken words to be understood,
"to be heard". Research has proven over and over again that
intelligibility is in the higher frequency components of speech, and not
in the lower. However hifi sounds is generally supported with the lower
frequency range. Thus 100hz -3800hz audio will sound great and be
preferred by most listeners, and 400-2000hz will be judged to narrow.
Pushing higher audio frequencies with out lows will also be crispy and
annoying to some.......but... Facts are that there is more energy in low
frequency components of audio and your RF output. Thus your RF output
will put most of its power into the low frequencies, And This Part Of
Your Signal Will Travel Farther As It Is Stronger In Watts. So it should
be easy to see that tests with locals will provide high frequency
components to your signal that those Further Away May Not Receive As
Well, Or At All. Lost higher frequencies in your audio means reduced or
lost intelligibility. Its a fact that 300/400-19900/2100 range audio is
considerably more intelligible under noisy, long range
communications....even though it receives poor Local reports. Even
though the higher frequency components may be in your signal when they
leave your station along with the lows, the received side is swamped
with the lows, and the highs cant be sorted out very well, especially in
Bottom line is that there is no ONE way to set your various audio
adjustments to meet all the different Qso circumstances that exist.
That's why the adjustments are in the radio in the first place, so you
can Change them to suit the situation at hand. For local or strong
signal conditions with out Qrm/Qrn use wide audio range settings, and
little to no compression. For other circumstances start reducing the
lows, increasing the highs, and use some compression. It is not unusual
for a far station to love your audio, and one close in to complain about
it.....but the one complaining can still make out what your saying,
Satisfy the local or strong signal, and sacrifice the further weaker
one. A weaker signal can out perform a stronger one on long haul
contacts just due to audio characteristics.
Keep in mind that compression will average out audio output for the
entire audio frequency range being used. Thus if your sending lots of
lows, lows will dominate the compression effects. That's why some start
at the mike for setting the first audio range, then the if filters, and
any DSP options.
If you have tailored your audio to fit the long haul HF QSO, and used
narrow if filters, and some compression to keep your low audio output
level up, your transmitting signal will be so much more effective
because its power is being used to transmit Intelligible audio that is
needed on the other end, and not wasted in lows that don't support
It should now be clearer that the settings used in transmitting and
receiving HF signals can have a lot of options. Just because they are
not set for the circumstances being used doesn't make the radio a good
one or a bad one. Good audio starts with your vocal cords, the noise in
your room, the mike, runs through the entire radio to the antenna, HF
conditions, the receiver, speaker and ears on the other end. A problem
with any part of that path can ruin audio. Many older folks or noise
damaged ears suffer in the higher frequencies. It is normal for them to
compensate their audio to make up for what their ears are poor at. So
before saying good or bad, why not instead compare the circumstances and
say better than or worse than, or for this circumstance
its............etc, but more importantly, Can The
Words Be Made Out?
I especially like using mode/filter diversity techniques in dual
receiver rigs. Bringing the human brain into play to sort signal
information is very effective in copying signals under various
conditions. When the left ear hears one version, and the right ear a
different version, a spatial effect, almost 3d kicks in that make for
very enjoyable listening of what was poor audio or band conditions. But
if the information needed is not in the signal to begin with, or is not
in proportion to the ability to sort it, even this technique doesn't
help. (On a AM shortwave station, put one receiver on Usb, and the other
on Lsb. Use stereo speakers or headphones.
Also try wide filters on one, narrow on the other, DSP on one, not on
the other, etc etc. Similar effects for Ssb and terrific affects for Cw)
Distortion is due to wrong impedance mikes, too high gain levels, wrong
AGC settings, RFI, alc, phase noise in switching power supplies,
incorrect filter or DSP settings, poor antenna connections or bad coax,
phase/fading band conditions, signal overload, noise blanker on with
strong signals not far away from the operating frequency, low battery
voltage, shielding and grounding problems, etc etc. Distortion is not
what I am trying to discuss here, just to avoid it.... hi hi Distortion
is not the same as frequency effects.
Sorry, but I can not respond to requests for help with certain makes or
models of gear, or circumstances that you use it under. But it is hoped
that this simplified generic treatment of audio will help you develop a
plan to evaluate the way you configure your radio so you can find what
is best for your gear, voice/ears, HF conditions, distance, and personal
Bill Stamps - WD8ARZ
Adjusting the FT1000MP for AM Transmission by K1DEU
Adjusting the FT-1000 MP or most any 100 watt output SSB transceiver for
AM transmission. IE. Is your voice lopsided ?
If you had a symmetrical voice, which a female or a very high pitched
male have , 100% modulation of a 25 watt carrier would produce 100 watts
PEP. Deep sounding males ( thanks to their larynx ) can easily be
asymmetrical ( lopsided ) up to 150% which would mean that a 12.5 watt
carrier would produce 100 watts PEP. I run a carrier level of 10 to 15
watts on AM for little distortion. I can push it to about 20 watts, but
other fussy people notice the distortion. I also have audio phase
reversal switches on my microphones. With a Oscilloscope you can quickly
get your audio phase properly set for about a negative going 95 % and
well over a positive going 100% ( up to 145% ) modulated carrier. Thus
your output wave form would be identical to your audio input wave form.
The last thing we want to do is over modulate with negative going ( over
- 100% ) modulation as substantial adjacent channel noise is produced
when the low level mixer is cutoff (carrier cutoff). Therefore with a MP
( 100 PEP) I recommend 15 watts and a Mark 5 ( 200 PEP ) 30 watts with
audio phase set for more positive going than negative going modulation.
You can feed your mike directly into a scope to check your asymmetry.
But put scope on RF for proper phase setting as even some factory mikes
are backwards. In SSB there is no need for any phase check.
With no modulation .. RF power level on front panel fully clockwise. AM
position. Set internal carrier level pot to 15 watts output for a MP...
30 watts for a Mark 5. These are the maximum carrier amounts for an
asymmetrical (male) voice ! he 15 watts applies to any 100 watt PEP
output transmitter. Now when you modulate, crank up the Mike gain
watching a watt meter on Average ( not peak ) Power, until the carrier
power only occasionally kicks downward. This downward kick is your
carrier being cutoff, resulting in distortion. No downward deflection
would be distortion free. Without compression or peak limiting a little
downward would be acceptable to keep the average up. If you monitor
yourself with good headphones ( I like Sony CD10's about $20) , as you
bring up the Mike gain you should hear the distortion as you start to
kick your external average watt meter downward. When set properly with
little average downward, now observe the Internal PO (power out) meter.
You should see your 15 watts of carrier and as you modulate your peaks
of 100 watts or slightly higher should show momentarily. Although your
carrier power is only 15 watts your PEP will be 100 watts or slightly
higher. Yaesu properly automatically disables ALC and Processing in AM.
By the manual I set my metering menu hang time to two seconds (2000 ms)
for all functions. For excellent modulation reports I use a $30 dollar
Radio Shack Mike #34069 with a Radio Shack wind sock plugged into the
RCA Phone Patch input on the rear and the FT-1000 MP's internal TX EQ
Menu 4-4 set to #4. And then to roll off some lows on SSB ( as my voice
is too bassy ) : Menu 7-7 SSb-t at 150-3100 or 200-3100 .