[Moon-net] AIR FLOW 3CX1500

[F1DUZ]

May be the compartment as some influence if, like in my case, the air go
through grid compartment, the socket then through the tube.
----- Original Message ----- 
From: "Peter Voelpel" <df3kv at t-online.de>
To: <Moon-net at list-serv.davidv.net>
Sent: Friday, August 18, 2006 2:09 PM
Subject: Re: [Moon-net] AIR FLOW 3CX1500


> I imagine the back pressure on the blower is caused by the tube itself and
> not by the compartment.
> The construction of the anode cooler, size, density of the fins etc. are
> responsible for the back pressure and can not be reduced at a given air
flow
>
> 73
> Peter
>
> -----Original Message-----
> From: Moon-net-bounces at list-serv.davidv.net
> [mailto:Moon-net-bounces at list-serv.davidv.net] On Behalf Of Lance
Collister
> Sent: Freitag, 18. August 2006 15:16
> To: Pat Barthelow
> Cc: Moon-net at list-serv.davidv.net
> Subject: Re: [Moon-net] AIR FLOW 3CX1500
>
> Pat Barthelow wrote:
>
> >Philippe:
> >
> >Re heavy duty use of the 3CX 1500  (8877) on 2m, the site:
> >
> >http://www.g8wrb.org/data/Eimac/3CX1500A7.pdf
> >
> >Shows for HF, a minimum of 38 CFM at .6 " Hg  backpressure is required,
> with
> >higher values called for at higher frequencies.
> >That is a pretty strong blast of air,  requiring a pretty strong squirrel
> >cage type blower...Or, If I was building it  here in the US, I might go
to
> >Walmart, and find a cheap, small Shop Vac Vacuum Cleaner and route its
> >output hose into the amp air plumbing, from some distance, or through the
> >wall of the shack to minimize in-shack noise.   Good luck...
> >
> >73, DX, de Pat AA6EG aa6eg at hotmail.com;
> >                  Skype:  Sparky599
> >
> >
> >
> >>From: "F1DUZ" <duz at wanadoo.fr>
> >>To: "Moon-net" <Moon-net at list-serv.davidv.net>
> >>Subject: [Moon-net] AIR FLOW 3CX1500
> >>Date: Fri, 18 Aug 2006 10:01:01 -0000
> >>Hi all,
> >>
> >>I would like to use a 3cx1500 on 2m in JT65, what is the minimum air
flow
> >>needed to have a good and safe cooling (in CFM or m3/h ) ?
> >>
> >>Thanks for answer
> >>
> >>best 73 all
> >>Philippe
> >>F1DUZ IN97nj
> >>Philippe Levron
> >>Malvaux
> >>49570 Montjean-sur-Loire
> >>France
> >>duz at wanadoo.fr
> >>
> >>
> >
> >
> >
> >_______________________________________________
> >Moon-Net posting and subscription instructions are at
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> >
> >
> >
> >
> You will be surprised at how much air you can get from a blower if you
> reduce the back pressure on it.  Here in my shack, I have used high
> volumne fans to "suck" air out of the top of the tank compartment to
> reduce the back pressure on the blower and let it really push the cool
> air through the tube.  Here is a photo of the way I did this on 8877
> amps for 2m and 6m:
>
> http://www.bigskyspaces.com/w7gj/W7GJ8877AMPS.jpg
>
> GL and VY 73, Lance
>
>
> -- 
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
> P.O. Box 73
> Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728
> URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11/6m DXCC #815
>
>
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