[AMPS] Emtron DX1

[Phil Clements]

>
> >Subject: Re: [AMPS] Emtron DX1
> >
> >
> >> >
> >> >My suggestion is this; for a permanent totally silent fix for your DX-1.
> >> >There is a large company here in the USA called W.W. Grainger.
> >> >They have all of the parts I am about to suggest.
> >> >
> >> >Since the fan is bolted to the rear of the cabinet outboard of the chassis,
> >> >it can easily be removed, and a suitable plenum fabricated to cover
> >> >the hole and adapt a 3 inch common clothes drier hose in its place.
> >> >On the other end of the hose, a suitable adapter is made to adapt the
> >> >hose to the centrifugal blower that you select for the job. The longer the
> >> >hose,
> >> >the bigger the blower you will need. Here at 600 feet above sea level, I
> >> >have a 1/12 HP blower feeding 25 feet of 2 1/2 inch hose, and it delivers
> >> >over 250 cfm of air to a pair of 4CX1500B's.
> >>
> >> What is the water-column pressure measured at the tube socket?
> >> thanks
> >
> >Quite a bit more than the stock internal blower. Exaust air flow nearly
> >doubled in pressure due to the size of the remote blower.
> >
> ''Quite a bit'' is not much help.   I need a measurement.  //  I am going
> after the statement of ''over 250 cfm...''.  Just because the blower
> manufacturer says congratulations, you have purchased a 250cfm blower
> does not mean that it will actually do 250.  .  Eimac says that at sea
> level, it takes 0.6" of pressure to flow 34cfm in a 4CX1500B.  My guess
> is that to put 250cfm through a pair of 1500B coolers, it would take a
> Force-4 hurricane.

Sorry, Rich...I cannot help you. I have no measuring equipment.
The "stock" blower in the Harris RF-110A puts out sufficient air to
cool the unit under the riggers of ship board and field operation
at all climates and altitudes, and guarantees 100% duty at 1KW
RTTY. All I know is that the exhaust air is double what the stock blower
was with this 1/12 HP monster that I now have at the other end of the 25 foot
hose.

BTW, the Harris scheme, IMHO, is almost as nifty as the Heath SB-220 .
Since cost and noise were no object, a 115v 400hz blower resides in
a duct running from the front of the unit to the tube compartment. I don't
know what the RPM is @ 400hz, but my guess is that the blades would
exceed Mach 1 if they went any faster. It can be heard a block away
without the muffler kit for the air intake, but since this is a remote controlled
amp, it made no difference to the Pentagon. I was going to let the stock
blower free-wheel after installing the new remote blower scheme, but
un-powered, the blades turned faster than when powered. I immobilized the
blades with a folded business card, and that solved the noise problem.

(((73)))
Phil, K5PC





--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm