But the unbalanced audio system,
along with the Behringer B1, appears to be working very well.
Chris
KA1GEU
-Original Message-
Message: 1
Date: Mon, 02 Feb 2009 12:40:00 -0500
From: y...@aol.com
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
To: FlexRadio@flex-
Assuming a low impedance mic and input and equal shielding, balanced
will always pick up less interference (common mode cancels out). We
frequently use 75 and 100 foot mike cable runs when recording performers
without an issue.
50 years ago (I was K3DNO then) most all ham equipment expected a
-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of y...@aol.com
Sent: Monday, February 02, 2009 12:40 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
Have been following this line for a while, going back to the original
: [Flexradio] Balanced vs. unbalanced microphone inputs
I hesitate to comment on this topic since already today my ideas on
various
subjects have been strenuously rejected but to carry the discussion to
the
extreme of shortness I would mention that when I consider feedlines
audio
frequencies. I would use cable rather than bell wire, but
73
Lee K9WRU
- Original Message -
From: "Lux, James P"
To: "Dennis" ; "Chris seeber" ;
"DudleyHurry" ; "Ray Andrews"
Cc:
Sent: Monday, February 02, 2009 8:17 AM
Subj
Mismatch doesn't affect shielding.
If you transition from your balanced openwire line to the pair of coaxes,
there's no reason why there should be any currents on the outside of the
coax shield. If there were, you could always choke it with the usual
appropriate ferrite or powdered metal cores.
Ob
On 2/2/09 5:13 AM, "Dennis" wrote:
> This is only true if the coax is properly matched, on both ends, to its
> characteristic impedance, whether you're using it single ended or
> differential So, using coax to replace tuned feeders is very problematic
> (looses go up) unless both ends of
This is only true if the coax is properly matched, on both ends, to its
characteristic impedance, whether you're using it single ended or
differential So, using coax to replace tuned feeders is very problematic
(looses go up) unless both ends of both coax cables are matched to their
chara
With high SWR the losses can easily be determined by TLW found on the CD
in the ARRL Antenna Book. The loss can be different depending on
whether the SWR is caused by a low resistance or a high resistance
because at HF the losss are largely IR due to the resistive part of the
load. At the sam
This is what programs like XLZIZL are for. Put the lengths of coax and
other components in, and see what the losses really are.
Gut feel.. 5 feet of anything won¹t make a big difference at HF.
Even if the VSWR is 20:1 (and the corresponding ISWR is the same) and you¹re
using open wire line becau
On 1/31/2009 8:47 AM, Ray Andrews wrote:
Chris,
The published loss spec for RG-11/U is 2dB/100' @ 100 MHz. This means that
at 100 MHz, the loss in a 5' run would be 0.1 dB. At frequencies below 30
MHz, the loss in a 5' run would be TOTALLY insignificant.
73, Ray, K9DUR
Those publish losse
f a loss at any
impedance - although I'm not 100% sure.
Chris
KA1GEU
-Original Message-
From: Ray Andrews [mailto:k9...@rnacs.com]
Sent: Saturday, January 31, 2009 9:47 AM
To: 'Chris seeber'; 'Lux, James P'; 'Dudley Hurry'
Cc: flexradio@flex-radio.biz
Subject:
Chris,
The published loss spec for RG-11/U is 2dB/100' @ 100 MHz. This means that
at 100 MHz, the loss in a 5' run would be 0.1 dB. At frequencies below 30
MHz, the loss in a 5' run would be TOTALLY insignificant.
73, Ray, K9DUR
___
FlexRadio Sys
s.
Thanks to everybody for the suggestions.
Chris
KA1GEU
-Original Message-
From: Lux, James P [mailto:james.p@jpl.nasa.gov]
Sent: Friday, January 30, 2009 1:43 PM
To: Dudley Hurry; Chris seeber
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Balanced vs. unbalanced microp
"
To: Dudley Hurry ; Chris seeber
Cc: "flexradio@flex-radio.biz"
Sent: Friday, January 30, 2009 12:42:33 PM
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
..
If you're having interference problems with balanced AUDIO cables, then
something else is wrong.
the trouble.
>
> Chris,
> KA1GEU
>
> -Original Message-
> From: Dudley Hurry [mailto:jhu...@austin.rr.com]
> Sent: Thursday, January 29, 2009 4:51 PM
> To: Chris seeber
> Cc: mindaugas2...@yahoo.com; flexradio@flex-radio.biz
> Subject: Re: [Flexradio] Balanced vs
.com; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
Chris,
If you are using balanced line and getting RFI, something is out of
balanced, most likely the latter line. You must be careful that the
lengths of both lines are exactly the same, a
Remember Chris
ALWAYS Balanced
Same with feedlines.hehehe
--Original Mail--
From: "Chris seeber"
To: "'Dudley Hurry'" ,
Sent: Fri, 30 Jan 2009 05:33:49 -0500
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
Dudley,
Than
ex-radio.biz
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
Chris,
If you are using balanced line and getting RFI, something is out of
balanced, most likely the latter line. You must be careful that the
lengths of both lines are exactly the same, and that includes the
seeber
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
I would think the audio quality difference will be incomprehensible
barring a ground loop or a level mismatch.
Please bear in mind that balanced audio circuits should have a
considerably higher immunity to strong RF fiel
Re: [Flexradio] Balanced vs. unbalanced microphone inputs
I would think the audio quality difference will be incomprehensible
barring a ground loop or a level mismatch.
Please bear in mind that balanced audio circuits should have a
considerably higher immunity to strong RF fields (RFI) than a typical
e shielded audio- a.k.a. "RCA or phono type" connections.
Carmine
W1EQX
--- On Wed, 1/28/09, Chris seeber wrote:
From: Chris seeber
Subject: Re: [Flexradio] Balanced vs. unbalanced microphone inputs
To: flexradio@flex-radio.biz
Date: Wednesday, January 28, 2009, 1:45 PM
Thanks to all wh
Thanks to all who have helped me out with this question. George, the
problem is that (1) the microphone needs 48V phantom power to work and the
Flex doesn't provide that and (2) the mixer doesn't have an XLR output (or
any balanced output for that matter). I should have checked that before I
purc
you could build a 1/ 4" TRS to 1 / 4" TRS jumper
cable and go into the balanced input jack and be ok.
Bill AD5OL
From: Chris seeber
To: flexradio@flex-radio.biz
Sent: Tuesday, January 27, 2009 7:53:51 PM
Subject: [Flexradio] Balanced vs. unbalanced
: [Flexradio] Balanced vs. unbalanced microphone inputs
I have a Behringer B1 microphone that I'd like to use with the Flex
5000A. I picked up a Behringer UB802 mixer so I could get the 48V
phantom power to the mic. Unfortunately the UB802 only has an
unbalanced output (1/4" phone jack -
Hello Chris,
I've found that the UB-802's unbalanced output drives the FLEX-5000 Line
input very nicely. I made up a cable with a 1/4" phone plug on one end
and a shielded RCA plug on the other, and I also installed two snap-on
ferrite cores at the RCA plug end of the cable.
I don't see any
I have a Behringer B1 microphone that I'd like to use with the Flex
5000A. I picked up a Behringer UB802 mixer so I could get the 48V
phantom power to the mic. Unfortunately the UB802 only has an
unbalanced output (1/4" phone jack - ground on the sleeve and audio on
the tip). The output has ab
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