Hi Tom,
Thanks for the clarification, and I don't disagree with your most recent
posting except I consider a well regulated supply to be one that has low
ripple, but that might be where you and I went astray on this posting
(sorry about that). My posting was not to tell folks that they should
rep
Tom, you said "Any test is meaningless", and I don't understand where you
are coming from on that statement. If you look at my test, I tested with
and without the bias Tee, and I tested with a well regulated bench top
linear power supply, and the results are similar so I don't see how you
can
s
Hi Tom,
I also just went and changed the RF load resistor to 200 ohms and checked
readings at various frequencies where the impedance was part reactive. I
also added a 3rd part to the test in which I physically removed
(disconnected) the DC power supply from the Bias Tee. All tests done using
my
RF
> choke shunted the analyzer (receiver) port.
>
>
>
> - Original Message - From: "Don Kirk"
> To: "topband"
> Sent: Saturday, August 23, 2014 10:48 PM
> Subject: Topband: Bias Tee Measurements (Test Data)
>
>
> Late last year Pete (N4ZR
valid test if a moderately low resistance 200-500 uH RF choke
shunted the analyzer (receiver) port.
- Original Message -
From: "Don Kirk"
To: "topband"
Sent: Saturday, August 23, 2014 10:48 PM
Subject: Topband: Bias Tee Measurements (Test Data)
Late last year
Late last year Pete (N4ZR) reported problems with his home brew Bias Tee
that included radical shifts in measured impedance when DC voltage was
applied to his Bias Tee. Today I decided to make impedance measurements on
a simple Bias Tee circuit I recently proposed for Dwight (NS9I) who was
looking
this application. Toroids.info has a
handy calculator for inductance.
-Jeff W0ODS
>
> From: "donov...@starpower.net"
>To: Pete Smith N4ZR ; topband@contesting.com
>Cc: Topband@contesting.com
>Sent: Thursday, November 14, 2013 8:11 AM
&
I am using my coax to feed 12 VDC to my remote RX antenna locations, using
a traditional bias tee, but am having some trouble with performance. I'm
using 100 uH Radio Shack chokes in my bias tee, and am wondering if perhaps
that is insufficient inductance for 160 meter operation. If so, what w
optimize the inductors.
73
Frank
W3LPL
- Original Message -
From: Pete Smith N4ZR <n...@contesting.com>
To: Topband@contesting.com
Sent: Thu, 14 Nov 2013 07:58:47 -0500 (EST)
Subject: Topband: bias tee
I am using my coax to feed 12 VDC to my remote RX antenna locations,
using a tradi
I am using my coax to feed 12 VDC to my remote RX antenna locations,
using a traditional bias tee, but am having some trouble with
performance. I'm using 100 uH Radio Shack chokes in my bias tee, and am
wondering if perhaps that is insufficient inductance for 160 meter
operation. If so, what
> So far this project has been lots of fun I used W7IUV preamp design with
> my own pc boards they work great best amps I've used before I just need to
> finish the rest of the package and see how the whole system works.
> 73 Dave
>> I’m designing a multi element receive array which
>> incorporat
ore I just need to finish
the rest of the package and see how the whole system works.
73 Dave
From: "donov...@starpower.net"
To: topband@contesting.com
Sent: Sunday, January 8, 2012 8:38 AM
Subject: Re: Topband: Bias Tee question
Dave,
Use a well o
ur own splitter with
large ferrite cores, but you can usually avoid that by using bandpass filters
and capacitors to protect the splitter from saturation.
73
Frank
W3LPL
Original message
>Date: Sat, 7 Jan 2012 15:08:48 -0500
>From: "ZR"
>Subject: Re: Topband: B
It never hurts to have a DC block when Murphy is around.
Carl
KM1H
- Original Message -
From: "Dave Kirk"
To:
Sent: Saturday, January 07, 2012 2:42 PM
Subject: Topband: Bias Tee question
> I’m designing a multi element receive array which
> incorporates the us
I’m designing a multi element receive array which
incorporates the usual 0 deg hybrid
combiner, 180 deg phase inverter, and 2:1 transformer. I’m going to use pre
amps on the antenna elements and need to supply 12 volts to them via the feed
lines through a bias tee. My question is do I need to worr
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