[CW] ITT MACKAY 3010C Manual

[Richard Knoppow]

    This is the data sheet and price list I referenced. For an 
operating and service manual see:

<http://jptronics.org/Mackay/mackay_3010B.pdf>

or:
<http://bama.edebris.com/manuals/mackay/ITT3010C/>

The PDF is cleaner.

    I think there is  yet another copy, a JPG but I can't find 
the source.
    Read the notice on the front: The 3010B and C are the same 
except for one TC cap added to the B. There is also a note about 
changing the rectifier diodes. Since only part numbers are given 
I have no idea what this is but suspect that a higher voltage or 
current diode was used.
     There is some discussion to be found at various sites. Some 
by people who seem not to be familiar with the receiver at all. 
One remarks his receiver has backlash in the tuning but the 
tuning is directly coupled to the capacitor in the VFO so that 
doesn't really sound possible unless there is a loose shaft 
coupler. Also, someone remarks that the hand selected diodes in 
the first mixer have likely drifted and can be replaced by modern 
Shotky diodes. This might explain why some think the receiver has 
poor IMD performance. Also, the alignment of the intermediate 
filters is likely critical, at least must be done right. If not 
it could certainly contribute to poor IMD. I am amazed at how 
often some sophisticated receiver or other equipment is reviewed 
without insuring that its tuned up, has good tubes, etc. Too 
often it looks like something was tested just as it came from the 
trash can.
     MacKay equipment was mostly built by Federal Telegraph and 
Radio, which began as a manufacturer of arc converter 
transmitters and was one of the founding companies of Silicon 
Valley.
     There is a good deal of history of Federal and MacKay on the 
web. MacKay (pronounced Mac Key) was the rival of RCA but also 
operated undersea cables in both Atlantic and Pacific service as 
well as wireless telegraph and telephone service. The MacKay 
family also operated Postal Telegraph company until selling it to 
Western Union who pretty much destroyed it.
     The next generation of receivers after the 3010 and the 
similar receivers made by RCA and Marconi were far more 
sophisticated, solid state, synthesized receivers. Harris also 
made some. A different world.
    I wonder if anyone on this list, I suspect David Ring, has 
had experience with the 3010C either in commercial service or as 
a ham receiver.

On 5/14/2022 5:48 PM, D.J.J. Ring, Jr. wrote:
> https://ia803401.us.archive.org/17/items/3010-c-itt-mackay-ocr/3010C_ITT-MackayOCR.pdf#page=1&zoom=auto,-150,792 
> <https://ia803401.us.archive.org/17/items/3010-c-itt-mackay-ocr/3010C_ITT-MackayOCR.pdf#page=1&zoom=auto,-150,792>
> 
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL