[1000mp] Important question

[NOEL POULIN]

Hello Hans
Thanks for the informations..
Well as you probably know, I have Dunestar between the radio 2 and the
amp...This radio is for 40M and 15M only..
ANd also Dunestar between radio 1 (80M,20M 10M) and the second amp....
I took a good dummy load and put it on the second radio....just to
see.....with 100Watts, on 40M(7.038)
in the DUMMY LOAD, there is no signal at all, on the other radio.....at
14.076.
When I put 500 W in the dummy load, I hear something at 14.076, but there i
s no indication on the S meter...
Now if I put this 100W into a 40 M antenna , I have a reading of S9..on the
second radio....
When I put 500 Watts in the 40M antenna, I still have this S9 Reading...
Could it be better with stubs, or filters...For example there is on the
market a filter made by W3NQN for harmonics reduction   with almost no
insertion lost...
What do you think???
NOEL
----- Original Message -----
From: "Hans Remeeus" <hans at remeeus.nl>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Sunday, December 04, 2005 15:59
Subject: Re: [1000mp] Important question


> Hello Noel,
>
> The best way to reduce harmonics is to use a good Low-Pass Filter. A
> good Antenna Tuner will be helpful too.
>
> When I transmit with my Field on 3.500 MHz at my dipole antenne and
> receive its harmonics on my FT-1000D without external antenna, I have a
> S9 signal on the 2nd, 3rd and 5th harmonics and a S9+20dB signal on the
> 7th harmonic. This is with a Low-Pass Filter.
>
> When you use 100 Watt and have a harmonic surpression of 80 dB (which is
> very good!), than you still have enough power output to receive a strong
> signal on a second receiver at the same location.
>
> Try to receive your harmonics on another location, less than a mile from
> yours. You still will receive some of the harmonics from your
> transmitted signal. Just a few remaining milliWatts will be sufficient.
> Depending on the frequencyband where your are transmitting on, the
> signal strength will vary.
>
> Or try to measure your harmonics on a spectrum analyser. You will see if
> this is within the specifications of your rig and the demands of your
> administration. In our country we have to have a harmonics surpression
> of >50 dB on HF.
>
> 73.
> Hans Remeeus (PA1HR)
> http://www.remeeus.nl
> Communication is about people, the rest is technology.
>
>
>
>
> NOEL POULIN schreef:
> > Hello Everybody
> > I wonder what is the best way to reduce harmonic from a MARK FIELD  on
40 meters for example, and another FIELD on 20 meter ...
> > Is it normal to have a reading of S9 on 20 meters(example14.078) for 100
watts out from the second MARRK V at 7.039????
> > Please any advice will help a lot
> > Thanks
> > NOEL
> >
> >
>
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