Re: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Larry Horlick]

Don,

I cannot speak to the Amtronix, but I use an Eagle RLB150 and can say
without reservation that it is an
excellent product. I use almost daily for tuning various types of cavities.
In fact if you buy an Aeroflex
(formerly IFR) radio test set, and order the RLB option what you get is an
Eagle.

lh

On Wed, Mar 17, 2010 at 3:03 AM, Don Kupferschmidt
wrote:

>
>
> It would be nice if *someone or many* on the list would be nice to respond
> to this.  There were other discussions in the past about the RLB, but know
> one ever responded.
>
> I'm hoping that others looking on can gain an education.
>
> Thanks,
>
> Don, KD9PT
>
>
>
>
>  - Original Message -
> *From:* Don Kupferschmidt 
> *To:* Repeater-Builder@yahoogroups.com
> *Sent:* Tuesday, March 16, 2010 1:58 PM
> *Subject:* Fw: [rfamplifiers] Return Loss Bridge Kit
>
> Cross posted to rb list.
>
>
> - Original Message -
> *From:* Don Kupferschmidt 
> *To:* rfamplifi...@yahoogroups.com
> *Sent:* Tuesday, March 16, 2010 1:57 PM
> *Subject:* Re: [rfamplifiers] Return Loss Bridge Kit
>
> Jeff & Skipp,
>
> There's an EBAY auction right now selling Eagle RF return loss bridges for
> $489.00.  Here's the link:
>
>
> http://cgi.ebay.com/EAGLE-RLB150X3-RETURN-LOSS-BRIDGE-5MHZ-1300MHZ_W0QQitemZ380211935016QQcmdZViewItemQQptZBI_Analyzers?hash=item588665b728
>
>
> You know the old saying, "you get what you pay for."  Just wondering how
> the Eagle brand stacks up against the one that Amtronix is selling.
>
> Also, are there other comparable units out there for less money?  Maybe the
> list members will chime in with ideas.
>
> 73,
>
> Don, KD9PT
>
>
>
>
>
> - Original Message -
> *From:* skipp025 
> *To:* rfamplifi...@yahoogroups.com
> *Sent:* Tuesday, March 16, 2010 11:18 AM
> *Subject:* [rfamplifiers] Return Loss Bridge Kit
>
>
>
> Group Member Jeff posted this at another location and the info
> is well worth sharing here.
>
> Amtronix (a Test Equipment Repair Facility near Buffalo, NY)
> is offering a kit form Return Loss Bridge.
>
> http://www.amtronix.com/rlb.htm
>
> ... and you'll notice the source/reference article/web page.
>
> http://www.wetterlin.org/sam/Reflection/Bridge_BalunPlusBeads.pdf
>
> I think this is a pretty neat idea/kit.
>
> cheers,
> skipp
>
>  
>

Re: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Chuck Kelsey]

Some time ago, someone posted about making their own return loss bridge 
using an HP directional coupler. I thought that I'd saved the information, 
but cannot find it. The cost was reported to be less than $50 using a 
surplus coupler.

Chuck
WB2EDV



-
On Wed, Mar 17, 2010 at 3:03 AM, Don Kupferschmidt  
wrote:


It would be nice if *someone or many* on the list would be nice to respond 
to this.  There were other discussions in the past about the RLB, but know 
one ever responded.

I'm hoping that others looking on can gain an education.

Thanks,

Don, KD9PT









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RE: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Jeff DePolo]

How about this.  I'll ask Rick if he'll send me a demo unit, and I'll
compare it to my Eagle, using my VNA as the reference (Agilent E5070B).

--- Jeff

   
> 
> First thing I would say is that if Rick is selling it, assume 
> it works.
> 
> I run an Eagle unit and would be glad to do comparison 
> testing if someone would like. I have run a number of tests 
> with the Eagle on various pieces of equipment and could 
> repeat some of the same tests with the Amtronix unit. 
> 
> The Eagle unit came in a complete kit for the HP service 
> monitor including cables, precision load and short and two 
> attenuators.
> http://www.eagle-1st.com/kits.nsf/F221 
>  !OpenFrameSet
> 
> My experience with the Eagle is also tied to the RFT-1000 
> program / HP service monitor.
> http://aa9nv.r2i.net/HP8924C.htm  
> 
> The Eagle unit has performed flawlessly on the HP and the IFR 
> service monitors even after traveling between DC and 
> Wisconsin on many trips. 
> Should buy Rick's unit and leave it up North. :)
> 
> Travis
> AA9NV
> 
> --- In Repeater-Builder@yahoogroups.com 
>  , "Don 
> Kupferschmidt"  wrote:
> >
> > It would be nice if *someone or many* on the list would be 
> nice to respond to this. There were other discussions in the 
> past about the RLB, but know one ever responded.
> > 
> > I'm hoping that others looking on can gain an education.
> > 
> > Thanks,
> > 
> > Don, KD9PT
> > 
> > 
> > 
> > - Original Message - 
> > From: Don Kupferschmidt 
> > To: Repeater-Builder@yahoogroups.com 
>   
> > Sent: Tuesday, March 16, 2010 1:58 PM
> > Subject: Fw: [rfamplifiers] Return Loss Bridge Kit
> > 
> > 
> > Cross posted to rb list.
> > 
> > 
> > - Original Message - 
> > From: Don Kupferschmidt 
> > To: rfamplifi...@yahoogroups.com 
>   
> > Sent: Tuesday, March 16, 2010 1:57 PM
> > Subject: Re: [rfamplifiers] Return Loss Bridge Kit
> > 
> > 
> > Jeff & Skipp,
> > 
> > There's an EBAY auction right now selling Eagle RF return 
> loss bridges for $489.00. Here's the link:
> > 
> > 
> http://cgi.ebay.com/EAGLE-RLB150X3-RETURN-LOSS-BRIDGE-5MHZ-130
0MHZ_W0QQitemZ380211935016QQcmdZViewItemQQptZBI_Analyzers?>
hash=item588665b728 
> 
hash=item588665b728> 
> > 
> > 
> > You know the old saying, "you get what you pay for." Just 
> wondering how the Eagle brand stacks up against the one that 
> Amtronix is selling.
> > 
> > Also, are there other comparable units out there for less 
> money? Maybe the list members will chime in with ideas.
> > 
> > 73,
> > 
> > Don, KD9PT
> > 
> > 
> > 
> > 
> > - Original Message - 
> > From: skipp025 
> > To: rfamplifi...@yahoogroups.com 
>   
> > Sent: Tuesday, March 16, 2010 11:18 AM
> > Subject: [rfamplifiers] Return Loss Bridge Kit
> > 
> > 
> > 
> > Group Member Jeff posted this at another location and the info 
> > is well worth sharing here. 
> > 
> > Amtronix (a Test Equipment Repair Facility near Buffalo, NY) 
> > is offering a kit form Return Loss Bridge. 
> > 
> > http://www.amtronix.com/rlb.htm   
> > 
> > ... and you'll notice the source/reference article/web page. 
> > 
> > 
> http://www.wetterlin.org/sam/Reflection/Bridge_BalunPlusBeads.
> pdf 
>   
> > 
> > I think this is a pretty neat idea/kit. 
> > 
> > cheers, 
> > skipp
> >
> 
> 
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.733 / Virus Database: 271.1.1/2748 - Release 
> Date: 03/17/10 03:33:00
> 
> 
> 

Re: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Chuck Kelsey]

That would be ideal. Then everyone would know how the Eagle stands up 
against a serious piece of test equipment, as well as how Rick's model does. 
I'm betting that Rick's will hold it's own against the Eagle (which I've 
always thought was overpriced.)

Chuck
WB2EDV



- Original Message - 
From: "Jeff DePolo" 
To: 
Sent: Wednesday, March 17, 2010 9:32 AM
Subject: RE: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit


>
> How about this.  I'll ask Rick if he'll send me a demo unit, and I'll
> compare it to my Eagle, using my VNA as the reference (Agilent E5070B).
>
> --- Jeff

RE: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Jeff DePolo]

Rick said he'd send me one.  He's in the midst of making some design
improvements which he hopes will result in about 5 dB better directivity
than the original design.  He also said he's probably going to change to a
type N connector for the DUT port (a good idea). He's about to ship the last
of the stock he has, so it will be about two weeks before he gets me a unit
for evaluation.

--- Jeff WN3A
 

> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey
> Sent: Wednesday, March 17, 2010 9:38 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re: [rfamplifiers] Return 
> Loss Bridge Kit
> 
>   
> 
> That would be ideal. Then everyone would know how the Eagle stands up 
> against a serious piece of test equipment, as well as how 
> Rick's model does. 
> I'm betting that Rick's will hold it's own against the Eagle 
> (which I've 
> always thought was overpriced.)
> 
> Chuck
> WB2EDV
> 
> - Original Message - 
> From: "Jeff DePolo" mailto:jd0%40broadsci.com> >
> To:  <mailto:Repeater-Builder%40yahoogroups.com> >
> Sent: Wednesday, March 17, 2010 9:32 AM
> Subject: RE: [Repeater-Builder] Re: [rfamplifiers] Return 
> Loss Bridge Kit
> 
> >
> > How about this. I'll ask Rick if he'll send me a demo unit, and I'll
> > compare it to my Eagle, using my VNA as the reference 
> (Agilent E5070B).
> >
> > --- Jeff
> 
> 
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.733 / Virus Database: 271.1.1/2748 - Release 
> Date: 03/17/10 03:33:00
> 
> 
> 

Re: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

[Kris Kirby]

On Wed, 17 Mar 2010, kb8stb wrote:
> I have an MFJ 269 (i know its not a "precision" instrument...) but at 
> the hobby level is there any reason for me to think about building 
> this thing?
> 
> What does it do (even the $498 one) that my 269 dose not? (ignoring 
> the precision issue)
> 
> I ask in hoping to learn something more about radio and test 
> equipment.

I figured out quite by accident one night that an MFJ-259 and a 
directional coupler can be used with an HP-141T to simulate a tracking 
spectrum analyzer. By using the analog storage function of the scope, 
you can verify what the output of the MFJ-259 is when feeding the 
directional coupler into a dummy load. Then reverse the directional 
coupler, and the sweep should be flat and low-level if there is a dummy 
load on the coupler. Finally, you attach the antenna or other device and 
look at what power is reflected. 

I had the benefit of being able to do this in a number of different 
ways, using an isolator shelf with a 250W dummy load, -30dB directional 
coupler, and my other directional coupler of unknown rating. 

--
Kris Kirby, KE4AHR
Disinformation Analyst