Hello Michael,

There is no reason to apologize for being good with analog. ;-) I
worked as a broadcast engineer during the time they announced the first
memory chip, (1101) which was a slow, noisy 256 bit * 1 DRAM with very
critical timing. I also did analog and digital work on the microwave
equipment built at Microdyne, before L3-Com closed the Ocala plant.


Seems you started with digital stuff a year or two earlier than I did.
My first RAM had a whopping 1024 bits. Not bytes, bits. 21...something,
I could look it up since the device where its in still works.


The reason I asked about the microwave equipment, I would like to
meet the people who designed the C-band CATV receivers I had to maintain
in the '80s. I always loved Collins equipment, till I ran into those
radios. They had a horrible failure rate, ...


But their HF radios were quite reliable. Unfortunately at that time out
of my budget range, and so were those nice mechanical filters :-(

Regards, Joerg

http://www.analogconsultants.com

Joerg wrote:

Hello Michael,

There is no reason to apologize for being good with analog. ;-) I
worked as a broadcast engineer during the time they announced the first
memory chip, (1101) which was a slow, noisy 256 bit * 1 DRAM with very
critical timing. I also did analog and digital work on the microwave
equipment built at Microdyne, before L3-Com closed the Ocala plant.


Seems you started with digital stuff a year or two earlier than I did.
My first RAM had a whopping 1024 bits. Not bytes, bits. 21...something,
I could look it up since the device where its in still works.

2114? 1K * 4 bits?

The reason I asked about the microwave equipment, I would like to
meet the people who designed the C-band CATV receivers I had to maintain
in the '80s. I always loved Collins equipment, till I ran into those
radios. They had a horrible failure rate, ...

But their HF radios were quite reliable. Unfortunately at that time out
of my budget range, and so were those nice mechanical filters :-(

Regards, Joerg

http://www.analogconsultants.com

I still have an unused 2.1 KHz Collins 455 KHz mechanical filter I
bought at the Dayton hamfest years ago. Its a little narrow for voice,
but it would be good for CW.

I still like Collins equipment, just not their poorly designed CATV
equipment. I wish I could afford a R-390 and felt well enough to do a
complete restoration.

--
?

Michael A. Terrell
Central Florida

Michael A. Terrell wrote:
Joerg wrote:

Hello Michael,

There is no reason to apologize for being good with analog. ;-) I
worked as a broadcast engineer during the time they announced the
first memory chip, (1101) which was a slow, noisy 256 bit * 1 DRAM
with very critical timing. I also did analog and digital work on
the microwave equipment built at Microdyne, before L3-Com closed
the Ocala plant.


Seems you started with digital stuff a year or two earlier than I
did. My first RAM had a whopping 1024 bits. Not bytes, bits.
21...something, I could look it up since the device where its in
still works.

2114? 1K * 4 bits?

Nah - 2102 1k * 1.

Had 8 of 'em in in my homebuilt Nascom 1 computer which with a
2708 UVEPROM for the 'monitor' was all the RAM for system and
user code and video store! Nevertheless, it was sufficient for a
machine code program to run 'Lunar Lander', hee hee.

Collins filters were regarded as the bees knees in UK ham circles
but I never could afford one!

73 de G3VPC

--
Graham W http://www.gcw.org.uk/ PGM-FI page updated, Graphics Tutorial
WIMBORNE http://www.wessex-astro-society.freeserve.co.uk/ Wessex
Dorset UK Astro Society's Web pages, Info, Meeting Dates, Sites & Maps
Change 'news' to 'sewn' in my Reply address to avoid my spam filter.

Graham W wrote:

Michael A. Terrell wrote:
Joerg wrote:

Hello Michael,

There is no reason to apologize for being good with analog. ;-) I
worked as a broadcast engineer during the time they announced the
first memory chip, (1101) which was a slow, noisy 256 bit * 1 DRAM
with very critical timing. I also did analog and digital work on
the microwave equipment built at Microdyne, before L3-Com closed
the Ocala plant.


Seems you started with digital stuff a year or two earlier than I
did. My first RAM had a whopping 1024 bits. Not bytes, bits.
21...something, I could look it up since the device where its in
still works.

2114? 1K * 4 bits?

Nah - 2102 1k * 1.

That was one early memory chip i don't recall using.


Had 8 of 'em in in my homebuilt Nascom 1 computer which with a
2708 UVEPROM for the 'monitor' was all the RAM for system and
user code and video store! Nevertheless, it was sufficient for a
machine code program to run 'Lunar Lander', hee hee.

Collins filters were regarded as the bees knees in UK ham circles
but I never could afford one!


The price was right, that day at the Dayton hamfest. ;-)

73 de G3VPC


--
?

Michael A. Terrell
Central Florida