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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