The secret is to not allow the negative peaks to cut off. The positive peaks
can go above 100%. That's not a problem. But, it's the negative peaks
cutting off the RF that causes distortion and splatter.
My $.02 worth.
73,
Bill, W3XO
--------------------------------------------------
From: "Chuck ONeal" <cdon...@comcast.net>
Sent: Saturday, April 26, 2014 4:08 PM
To: <flexradio@flex-radio.biz>
Subject: Re: [Flexradio] FlexRadio Digest, Vol 108, Issue 22
Hi Bill and others,
To truly optimize any transmitter for AM, including SDR's, you should
employ some form of negative peak limiting to eliminate distortion and
clipping due to overmodulation. None of the Hi Fi boxes folks put on
their rigs do this since this functionality in not included. Compression
will not do it since it's not fast enough. Limiters are symetrical and
not multiband which will result in very audible distortion.
For reasonable $$, used AM brodacast processor(s) like ones in the CRL or
Orban lines will do this. They employ adjustable assymetrical limiting
that will prevent overmodulation within the capabilities of the
transmitter without adding audible distortion. Additionally, the
broadcast processors will add significant audio density to improve
intelligibility and give you that "broadcast" sound if you want it.
A really good set up would be the CRL SEC-400 Spectral Energy Compressor
coupled with the CRP PMC-450 Peak modulation controller. You can get the
pair for a few hundred dollars if you look around. The SEC-400 will give
you multiband processing, EQ and increased audio density. The PMC-450
will provide precise peak modulation control and additional modulation
density. Or you can go with an Orban Optimod 9000A or one of the later
versions but they are still pricey since they also work well. All good
old analog stuff.
You can go really crazy and go for an Omnia One or Orban 9300 but these
are contemporary AM broadcast processors and run $3-4$K
All the above is probably overkill for an ham rig but it will make you
sound like you are running a converted broadcast transmitter and help get
rid of that extra $$! Depends on how nuts you want to go.
Seems to me that all this processing could be included in the software for
SDR's at some point. The new AM processors are all DSP anyway.
Chuck, K1KW
Hello All
As an AM -er I want to add some external components to my
Flex 3000. I want to by pass the EQ. I will be adding an external EQ,
and compressor limiter. Any suggestions as to other external devices
and which may be the better brands for the Flex 3000
Thanks
Bill
Hello Bill,
I use to use out board rack systems but I find using the EQ in the
software with just a Behringer Tube Preamp 1952 along with a RE20 Mic does
wonders!
So no more 1124P Feed Back Destroyer and no more DEQ 2496.
Life is more simpler and the audio is just as good!
And I have always gotten unsolicited audio reports.
But I have been told that the 528E is the best around processor for the
money. I did try a used one but it had issues so I had gotten my money
back and never pursued after another one.
(Can you be found on 10 meter AM? If not, then where?)
Oh, what is your call sign?
Best of Luck!
Ken
K3YI
On Saturday, April 26, 2014 1:00 PM, "flexradio-requ...@flex-radio.biz"
<flexradio-requ...@flex-radio.biz> wrote:
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of FlexRadio digest..."
Today's Topics:
1. Re: 7P8JR, the TNF and my Flex-5000 (Paul Jursinic)
2. Vacation (Neal Campbell)
3. EQ,s (William and Susan)
----------------------------------------------------------------------
Message: 1
Date: Fri, 25 Apr 2014 18:46:24 +0000
From: Paul Jursinic <pjursi...@wmcc.org>
To: "'vtnn...@comcast.net'" <vtnn...@comcast.net>, Flex Radio
<flexradio@flex-radio.biz>
Subject: Re: [Flexradio] 7P8JR, the TNF and my Flex-5000
Message-ID: <7aa72ca38a98e94e929d7f20ee8c7b88c7689...@exch.wmcc.org>
Content-Type: text/plain; charset="us-ascii"
I own a Flex5000 and have found the notch filter in PowerSDR to be an
extremely useful tool. I love it!
However, I have in the past 6 months been experimenting with an RTL2832U
receiver used as a SDR component in the IF of an IC-728 transceiver. The
RTL2832U is controlled with HDSDR software. The HDSDR software has a notch
filter that can place multiple notches in the receiver bandpass. This
filter combination compares well with the PowerSDR notch filter. So, here
is an example of software and hardware that compare well with my Flex5000
and PowerSDR.
Paul K9IRO
-----Original Message-----
From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of
vtnn...@comcast.net
Sent: Thursday, April 24, 2014 6:28 PM
To: Flex Radio
Subject: [Flexradio] 7P8JR, the TNF and my Flex-5000
Earlier today I went looking for 7P8JR on RTTY and found him and a Spanish
station transmitting almost on top of each other. I really wanted 7P8JR
but the ED station was making it hard to hear him so I created a TNF, made
it very narrow and
stuck it on the ED's space frequency. Then I created another one and put
it on the mark frequency of 7P8JR of the Spanish station. That gave me
about 90% solid copy and I made the QSO (my Elecraft KPA-500 helped a LOT
too!).
Is there any other non-Flex rig that can do what I did above? Makes me
feel bad for the rest....
I still love my 5000!
73
Zack
N8FNR
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------------------------------
Message: 2
Date: Sat, 26 Apr 2014 11:23:07 -0400
From: Neal Campbell <nealk...@gmail.com>
To: "flexra...@yahoogroups.com" <flexra...@yahoogroups.com>,
"flexradio@flex-radio.biz" <FlexRadio@flex-radio.biz>
Subject: [Flexradio] Vacation
Message-ID:
<CAOx8i93JT+PCBYc1vp=4tldg_r8hi9n0cmwqmslgms6qrql...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
I will be on vacation the next 2 weeks so if you cannot reach me, that is
the reason why! Hopefully I can get internet connectivity but it might
take
me a few days.
73
Neal Campbell
Abroham Neal LLC
------------------------------
Message: 3
Date: Sat, 26 Apr 2014 12:28:27 -0400
From: "William and Susan" <ope...@rcn.com>
To: <FlexRadio@flex-radio.biz>
Subject: [Flexradio] EQ,s
Message-ID: <F730F2A524DB4761A37803BFBB4A08E2@EPSDRPC>
Content-Type: text/plain; charset="iso-8859-1"
Hello All
As an AM -er I want to add some external components to my Flex 3000. I
want to by pass the EQ. I will be adding an external EQ, and compressor
limiter. Any suggestions as to other external devices and which may be the
better brands for the Flex 3000
Thanks
Bill
------------------------------
Subject: Digest Footer
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------------------------------
End of FlexRadio Digest, Vol 108, Issue 22
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