[R-390] My Bobbsey Twins

Fri Jul 5 18:33:21 EDT 2019

Naw, I didn’t roll my own.  eBay for both.  The parts would cost me as much or more as I paid for them…

John

From: Don Reaves <donreaves at gmail.com> 
Sent: Friday, July 5, 2019 11:48 AM
To: jgedde at optonline.net
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] My Bobbsey Twins

John, 

Did you roll your own BG7TBL standard and distribution amp or find something already packaged up?

Why do we list members have an interest in frequency standards, you might ask?  Well, having a disciplined standard is not only essential to keep test equipment locked in, digital modes on the ham radio shortwave and longwave bands like WSPR and FT8 need accurate stable frequency references to keep receivers and transmitters on the same time tics.

Don

PS, the HP-3478 is one of my favorites. 

On Fri, Jul 5, 2019 at 9:41 AM <jgedde at optonline.net <mailto:jgedde at optonline.net> > wrote:

Hiya Don,

Just a quick run-down of my bench equipment as requested:

Power Designs  TW500T Twin 0-50V Power Supply
Bio-Rad 0-500V DC Power Supply
Rigol DP832 Triple Power Supply
Sorensen DCS33-33 0-33V/33A Power Supply
Micronta Dual 15V power supply
Keithley 2015-P Audio Analyzing DMM
HP 3466A DMM
HP 3478A DMM
Brymen BM869S DMM
Fluke 110 DMM
Simpson 260
Misc assorted low end DMMs
NRI Model 70 Tube Tester
Agilent 53131A Frequency Counter with 3.2 GHz option
Rigol DG1022U Function/Arb Generator
Rigol DS1102Z Scope
Tek 2465 Scope
Siglent SSA3021X Spectrum Analyzer
HP 8644A Sig Gen
BG7TBL 10 MHz GPS Disciplined Frequency Standard (GPSDO)
BG7TBL 10 MHz Distribution Amplifier

I am an electronics engineer by trade and do a lot of side-work in my home
lab so many of these pieces are a business need.

The 10 MHz standards are connected to my frequency counter, spectrum
analyzer, RF sig gen, etc. and keep everything locked to a single, very
accurate frequency standard (something like 40 parts per trillion)

The microscope is an absolute necessity since my eyes are no longer anywhere
near as good as they once were.  I need that for all but the largest SMT
stuff.  

John

-----Original Message-----
From: r-390-bounces at mailman.qth.net <mailto:r-390-bounces at mailman.qth.net>  <r-390-bounces at mailman.qth.net <mailto:r-390-bounces at mailman.qth.net> > On
Behalf Of Don Reaves
Sent: Friday, July 5, 2019 10:21 AM
To: R-390 at mailman.qth.net <mailto:R-390 at mailman.qth.net> 
Subject: Re: [R-390] My Bobbsey Twins

Nice work, John.  You can be proud of either standalone or both side by
side.

I'm interested in the rundown on your workbench test equipment - looks like
some high end modern goodies residing above your twins.   And an inspection
scope to boot.   I do so appreciate the contrast, some might say irony, of
a high end modern workbench used to service and restore classic radio
receivers.  Its in the category of  "nothing is too good for our babies".

In fact, I would find it interesting what modern test gear list members use
and swear by, just for list members who are getting started putting together
a service bench or or upgrading.  We are always upgrading, aren't we?  I'm
in the process of restoring a Fluke 8842A DVM.  Not a modern meter by any
means but better than most of the other older Flukes and HPs on my bench.
And like my collection of R-390 gear, I need to downsize the older heavier
larger test equipment on my sagging workbench.  Looking for a replacement
for my HP-8640 sig gen.

Don

>
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-- 

Don Reaves  W5OR 

8101 Barrett Rd. 

Roland AR 72135
Fiber: 501.244.3574
Radio: 501.952.8573