Ok this is the test I just did.
I used my Kenwood TS2000 as the receiver.
I have a 6 position rotary switch that grounds the unselected positions.
This switch is what I use to move my antenna farm form rig to rig.
First I transmitted a dit stream at 14.080 from my 6500 at 100 watts.
The 6500 had an antenna connected to it through the rotary switch. The
TS2000 antenna input was grounded.
As I transmitted, the TS2000 when tuned to the exact frequency of the
6500 showed a pegged S9+60 reading. Moving the TS2000 up and down the
band showed a hash sound at a zero S meter reading.
I then switched in my Omni VII on the same frequency. The Omni VII was
then connected to my antenna farm. I transmitted the same dit stream at
100 watts at the same frequency. Again the TS2000 showed a pegged S
meter right on the same frequency of S9+60. I then tuned up and then
the band and heard the same hash sound. But this time the hash was all
S5 instead of S0.
My conclusion is the 6500 is putting out at least 30 db lower band noise
than the Omni VII.
I don't have my Orion here to test with.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 4/9/2014 4:01 PM, Rick - DJ0IP / NJ0IP wrote:
I'm pretty sure that if I had the time to go through the hundreds of emails
Rob has sent me, I would find the one talking about this broadband noise.
He listed a few transceivers which surprised me. I believe the 6500 was on
the list. For sure another very expensive (European) SDR transceiver was on
that list.
For now I will just say I retract everything I said at all about the 6500,
AND Carl, you can find out if 5 minutes if it's true or not.
Just do as I suggested in my previous post.
Then we will all know.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Carl
Moreschi
Sent: Wednesday, April 09, 2014 9:55 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] TECHNICAL: Wish List for ORION-III
You just should not comment about things you don't now about.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 4/9/2014 3:40 PM, Rick - DJ0IP / NJ0IP wrote:
Carl, I'm talking about TX noise, not RX noise.
And I don't think I am being unfair when I repeat things which I have
heard Rob Sherwood say.
I only clearly stated that I was not sure if the 6500 radio is like
this but most of the others are.
Do the following.
Set up your 6500 on an antenna and set up one of your other radios on
another antenna.
Listen on the other rado and key the 6500 in SSB mode without speaking
into the mic.
If it creates a broad noise across all bands, disturbing the other
receiver, it's noisy.
This is that broadband noise I'm speaking about.
You have a 6500, please try it and tell us.
I've never even seen one.
Also, repeat the test using the Orion as the TX.
It will be clean, I know for sure!
People often forget that a lot of other things factor in when you are
trying to operate in a multi-TX environment.
If you are using the radios one at a time, they are usually just fine.
AT THIS POINT I HOPE ROB SHOWS UP TO BAIL ME OUT (hi).
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Carl
Moreschi
Sent: Wednesday, April 09, 2014 7:28 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] TECHNICAL: Wish List for ORION-III
Rick,
That's very unfair of you to accuse the 6500 of being a broad band
noise generator. I am an avid DX'er and seacrh for signals right at
the noise level. My 6500 hears ever bit as well as my Omni VII,
Eagle, Argo VI, TS2000, 746Pro, Jupiter, Orion, and K3.
The Flex 5000 and others like it were direct conversion receivers.
The
6500 is an entirely new animal. It takes 0 to 77 mhz at the front end
and converts the entire band width to digital data. There are band
pass filters for each ham band that can be used or not used. Because
the clip point is so high at S9+80 db, the band pass filters are rarely
needed.
The results with this radio are truly astonishing.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 4/9/2014 1:50 AM, Rick - DJ0IP / NJ0IP wrote:
One last addition to the list, but then I must get on with my day job.
But before I add a point, I want to confirm what someone else said
earlier and thank him for saying it.
(sorry, forgot who posted it)
CLEAN TRANSMITTER
IMD and wideband noise are indeed very important. ESPECIALLY the
wide band noise if you want to work multi-multi.
In another thread the Merits of the Flex 6500's RX were highlighted,
but I know many similar radios have turned out to be broadband noise
generators.
I think the 6500 is too but I DO NO KNOW FOR SURE. IMO, again it is
the missing crystal filter that is part of the problem.
Now my NEW POINT:
Please improve the IP2 of the O3.
I don't recall the IP2 of the O2 but in the O1 and most other Ten-Tec
transceivers, the IP2 was relatively low (about 65dB).
Most of the focus for the past 30 years has been on IP3 - which is
indeed more important, but here in Europe, a weak IP2 also has
significant problems. Specifically, when operating on 20m with a
multiband antenna that is high and in the clear, at night you can
hear a carrier on 20m, every 10 kHz. These are shortwave broadcast
stations breaking though INSIDE the receiver, it's not their
harmonics. Monoband antennas help reduce this effect.
THE TEN-TECS WERE WORSE THAN THE (SAME CLASS) JA RADIOS IN THIS RESPECT.
BTW, Stuff like an Icom 706 were utter CRAP in this respect.
At night in my RV, even on the mobile antenna the carriers were
between 55 and 57 every 10 kHz. I had to insert a preselector or
Dunestar BPF to eliminate it and be able to work 20m.
PLEASE IMPROVE IP2.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
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