7 Jun
2016
7 Jun
'16
8:47 p.m.
I've been reviewing the 'conversion' document, found here:
https://nerp.net/~legendre/heathkit/3400/ET-3400_ET-3400A/Heathkit%20ET%203…
Which describes how to modify the ET-3400/A to mate with the ETA-3400 accy
unit. For some reason, a number of details - pictorials, it seems - are
missing from the document.
All of the missing details seem to involve modification and connection of
an 'RF shield' component, which might refer to a copper tape strip which is
part of the ET-3400 package. Apparently, the they intend for a wide copper
strip to interconnect the ground planes of the two chassis..?
My sense is that the info was left out as it's unnecessary to achieve
correct operation.. more of a "the FCC made us do this" sort of thing. Can
anyone comment on the omission, and any importance it might have?
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(My complete Heathkit 3400 series document set is here:
http://nerp.net/~legendre/heathkit/3400/
It includes all of the scanned 3400 materials I have collected, and I
believe it is complete, less the BASIC programming course materials. All
other documents, including the self-taught courses should be present.
Please advise if anything is missing, or if you can supply the BASIC course
documents.
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On Tue, Jun 7, 2016 at 3:58 PM, drlegendre . <drlegendre at gmail.com> wrote:
Hey, thanks for the catalog link. It confirms that the
'W' designation
indicates factory-wired units, in the case of both the trainer and the
accessory unit. But note the difference in assembly costs between the
ETW-3400 and the EWA-3400 accessory, I'm surprised that the latter would
take any more time to build than the former, but I'm sure they had their
reasons.
And it appears that the $47.00 chip option is for the extra 3K of SRAM
that the accy. board can hold (for the max total of 4K). Both the tiny
BASIC and monitor ROMs are standard equipment, and included in the regular
price - or at least they were in 1979.
On Tue, Jun 7, 2016 at 7:06 AM, william degnan <billdegnan at gmail.com>
wrote:
CORRECTION
I am wrong. The W means assembled in the factory apparently.
http://heathkit.garlanger.com/catalogs/1979/Heathkit_Catalog_845.pdf
For another $47 you could by the chipset for either the W or T versions.
Sorry about that.
b