[time-nuts] time-nuts Digest, Vol 118, Issue 64

Bob Betts rwbetts at sbcglobal.net
Thu May 29 22:57:27 UTC 2014

As I mentioned in my post, ESE had only the digital board schematic, not the receiver board.
I am hoping that an existing customer from a b'cast station or other such entity migh have an original manual. I was disappointed that they didn't have the product support material available in their archives. I guess a 15-year-old product isn't worth supporting to them. Our company maintains support info back to 1982. Based on some of the service work we've done lately, this unsupported obsolence seems to be a trend. I'll keep looking...and reverse engineering the board.
Date: Thu, 29 May 2014 09:14:09 -0700
From: "Burt I. Weiner" <biwa at att.net>
To: time-nuts at febo.com
Subject: [time-nuts] ESE ES-180 WWV Receiver Schematic...
Message-ID: <607801.21076.bm at smtp114.sbc.mail.ne1.yahoo.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed


Have you tried to contact ESE for the information.  In the past 
they've always been pretty helpful on obsoleted goodies.


A bit of trivia... ESE originally stood for "El Segundo Enterprises".

Burt, K6OQK

>Date: Wed, 28 May 2014 19:38:14 -0700 (PDT)
>From: Bob Betts <rwbetts at sbcglobal.net>
>Subject: [time-nuts] ESE ES-180 WWV Receiver Schematic
>Hi All:
>This posting is not about splitting milli-seconds or other accuracy 
>stuff, but I need help and thought of?our time-nuts group.
>At our Ham club we try to keep accurate time (think wall clock) for 
>logging certain tests, local and state emergency skeds and 
>coordination with other EmComm and ARES facilities. To that end, I 
>installed a?GPS receiver which was a more convenient upgrade from 
>the old Spectracom WWVB, 60 kHz clock and some other first efforts.
>We also acquired an ESE, ES-180 clock which decodes?data from any of 
>the?5 WWV HF broadcasts; 2.5, 5, 10, 15, 20 MHz. Okay fine. We have 
>3 clock reception options. Obviously, the GPS is the most 
>convenient, so good bye to the LF receiver.
>However, over time, we have come to use the 5-band HF clock as a 
>propagation beacon. A quick scan of the 5 bands gives us a good 
>feeling of the HF band?propagation quality for a given time of day, 
>sun spot activity, season, weather condx and the highest MUF band 
>(max usable freq). This is a great tool that covers a big portion of 
>our allocated HF privilages, 160 thru 15 meters.
>Sorry, this post is getting long.?Okay, so my point is that I?need 
>to find a schematic for the subject ESE clock. I need to make some 
>mods to the auto-scan circuits and do a (probably) overdue receiver 
>alignment. The ES-180 contains 2 PC Bd's; one for the display 
>drivers/7-segment encoders and the other is the receiver, scan 
>controller and data decoders. ESE had the schematic for the digital 
>board, but no archive material for the receiver section. I've been 
>searching the usual suspects, but no good fortune yet.
>I realize that this topic?is a bit different than what we usually 
>discuss here, but if anyone could point me in the right direction 
>for this schematic, we'd really appreciate it.
>Many thanks,
>Bob, N1KPR

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa at att.net

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