[NJARC] Re: Mackay Console

[Al Klase]

Rob and John,

Yes CW and MCW only on transmit.  Not as cool as I first thought.  Here 
Meir's discription:

Correction: These MF/HF Federal-MacKay consoles from the WW2 Liberty/Victory
ships have no AM capability at all. You must be referring to the post-WW2
commercial models
I happen to have the HF section of the same console, the Federal Telegraph
(later became ITT) FT-102. These have no power supplies, as power to the
transmitters was supplied by a huge 115 VDC input motor-generator (the line
voltage on these ships was 115 VDC).
I had to build a power supply for it. Power output is rated 200 W and it is
indeed in that neighborhood. It's a CW only transmitter, the model number of
the HF transmitter section is 167-BY. The receiver is an AC/DC RCA AR-8506B
(no transformer, it's powered directly from the 115 VDC line). According to
the manual, the E.H. Scott SLR-F was the alternative receiver, being very
similar in specs to the RCA model. In actual use, the transmitter has a
distinctive chirp, by which it can be readily identified on the air...
The other half of the console is the MF one, if I recall (I can look it up
in the manual) the MacKay transmitter is the 128-BY covering the marine
frequencies from around 300 to 600 KHz. The receiver in that part is the
MacKay 128-AX regenerative receiver, covering the LF/MF marine bands.
The center part of the console is the power control for the motor-generator
and the power transfer switch to transfer the high voltage to either the HF
or the LF/MF transmitter.

73, Meir WF2U



Rob Flory wrote:
> PS, I am pretty sure that the referred-to plate modulator is for MCW 
> only. This is an item for the brass pounders.
> RF
> ----- Original Message ----- From: "Al Klase" <al at ar88.net>
> To: "Ray Chase" <enrpnr at erols.com>; "Robert Flory" 
> <robandpj at earthlink.net>; "Harry Klancer" <klancer2 at comcast.net>
> Sent: Friday, January 18, 2008 6:42 PM
> Subject: [Fwd: Re: Radio ID Help]
>
>
>> Does anyone think we should try to grab this for the Museum?
>>
>> http://delaware.craigslist.org/ele/529088188.html
>>
>> See info below.
>>
>> Al
>>
>> -------- Original Message --------
>> Subject: Re: Radio ID Help
>> Date: Fri, 18 Jan 2008 20:01:31 GMT
>> From: k4pf at juno.com <k4pf at juno.com>
>> Reply-To: k4pf at juno.com
>> To: Old Tube Radios <boatanchors at theporch.com>
>> CC: boatanchors at theporch.com
>>
>>
>>
>> Hi,
>>
>> That is a radio console built by MacKay Marine
>> (later called ITT MacKay Marine)
>> for U.S. Liberty Ships/ Victory Ships during WWII.
>> It consists of an MF transmitter with plate modulator
>> for class A-1 and A-2, and a separate HF transmitter
>> for A-1.  Both transmitters commonly shared the same HV power supply.
>> There are two separate receivers for voice/c.w., one for HF and one 
>> for MF/LF.  The equipment was intended for use with long wire antennas
>> aboard ship, and the antenna couplers are built into the transmitters.
>>
>> The HF c.w. marine bands were at 4, 6, 8, 12 and 16 Mc.
>>
>> Later versions of this equipment used a pair of 813's in the final
>> of both the MF and HF transmitter, and were rated at 500W output each.
>> I believe the final DC input voltage was kept down during
>> the WW II period for a rated output of 250W.
>>
>> The console also includes a small emergency transmitter,
>> powered by a 12VDC input dynamotor, and equipment to send/receive the 
>> Autoalarm
>> signal on 500Kc (a long sequence of four-second dashes/ one-second 
>> spaces).
>>
>> 73,
>> Ed Knobloch
>>
>>
>>> Sam Stokes KG6WYZ
>> -- Hole In The Head Press <sestokes at sonic.net> wrote:
>> http://delaware.craigslist.org/ele/529088188.html
>>
>> Can anyone tell what this is?
>>
>>
>>
>>
>> -- 
>> Internal Virus Database is out-of-date.
>> Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 
>> 269.19.1/1220 - Release Date: 1/11/2008 6:09 PM
>>
>>
>>
>>
>> -- 
>> Al Klase – N3FRQ
>> Flemington, NJ
>> http://www.skywaves.ar88.net/
>>
>
>

-- 
Al Klase – N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/