Date   
Re: output level

Steven M. \(Mike\) dishop
 

Hi Ron,

I'm Mike, the main designer of the DX2400. Maximum power output depends on a
lot of things in a solid state amp, such as how close to 50 ohms resistive
impedance your antenna is. With that qualification, terminating the
amplifier into a 3KW Bird dummy load, I get 1500W out for 50 +/- 5W of
drive. Beyond 1500W output the drive increases. It takes the most drive on
21 MHz compared to any other band, and the least drive on 160m. The amp will
drive to >2KW output key down for less than 100W input on all bands. Beyond
90-95W of drive a protection circuit trips. Beyond 2200-2400W of output, a
protection circuit trips. There is only about 100W of difference if any
between PEP and Key down at 1500W out. I don't change the transceiver drive
when changing between CW and SSB. If you run ALC it won't matter anyway as
it will be clamped to 1500 out on every band and every mode.

The above statements are based on the linear power supply. If you get the
switcher there is no difference between PEP and key down, but you won't get
more than 2KW out anywhere as the switcher has less power than the linear
(5KVA vs 7KVA).

Operating your amp at legal limit, you will never have a problem with power
supply or heat. Steve and Marten run theirs heavy RTTY for multiple hours at
a time and don't have problems. I'm sure these gentlemen will tell you there
isn't anything on the market that can compete with this amp in terms of raw
power output and durability.

I hope this helps. Feel free to call me if you would like to discuss your
requirements further at 937 292 7981 or if you would like more photos,
brochures, etc. if you are contemplating a purchase. I'd like to add you to
the growing group of satisfied customers.

73,
Mike N8WFF

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of w2dxx
Sent: Sunday, November 07, 2010 8:26 PM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] output level

Hello all,

What has been your maximum measured RF output power for PEP on SSB and key
down on CW for different levels of input drive?

Thank you.

Ron
W2DXX



------------------------------------

Yahoo! Groups Links

Re: output level

Marten Guthrie
 

Ron,
 
I get 1500 watts output with 50 watts drive, if I increase the drive I get an alarm as I recall.
 
73 de marten  ve2wu
 

----- Original Message -----
From: w2dxx
Sent: Sunday, November 07, 2010 8:26 PM
Subject: [PrometheusDX2400] output level

 

Hello all,

What has been your maximum measured RF output power for PEP on SSB and key down on CW for different levels of input drive?

Thank you.

Ron
W2DXX

Re: output level

Steve Bolia
 

Ron

I can get 1500W out on CW with somewhere between 50 - 60 watts on 10 - 160.
Don't do much SSB stuff and I don't have a PEP meter but it appear to be as
advertised (more than my Acom 1000!!!). Depends on what your attenuators
are set at in the Factory settings.


73

Steve, N8BJQ

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of w2dxx
Sent: Sunday, November 07, 2010 8:26 PM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] output level

Hello all,

What has been your maximum measured RF output power for PEP on SSB and key
down on CW for different levels of input drive?

Thank you.

Ron
W2DXX



------------------------------------

Yahoo! Groups Links

output level

w2dxx
 

Hello all,

What has been your maximum measured RF output power for PEP on SSB and key down on CW for different levels of input drive?

Thank you.

Ron
W2DXX

Re: New member

Steve Bolia
 

Hi Al

I've talked to Mike about the remote panel a couple of times (we chat quite
often). Because the amp is so big it is hard to mount it where the front
panel is visible and easily accessible. We've had a few issues with
integrating the amp into my station and Mike has been great. Dealing with
SO2R, computer logging and Top Ten band decoders and WX0B antenna switches
is something he was not familiar with (but he is now!!) The ICOM is the
issue. CIV control works okay with the amp but you can't get the CIV to
work with the amp and N1MM logger at the same time. Think we have a
work-around that will fix that. At some point, I think the amp firmware
will be updated to handle this.

Steve

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of NN4ZZ
Sent: Wednesday, October 20, 2010 11:38 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Re: New member

Steve,
Welcome to the group, it is small and not very active yet. (the amp just
works, so that may be part of the reason). I enjoyed reading the CQ
review, hopefully it will generate some more interest and awareness.

I'm anxiously awaiting the enhancement to provide a "remote control" program
so I can view the status and control the amp from my PC. I know Mike is
working on it and hope we hear more soon.

73, Al




--- In PrometheusDX2400@..., "steve_bolia" <sbolia@...> wrote:

Hi

I'm Steve, N8BJQ

I own unit #7 with the SO2R board and the switching PS. Pretty active
contesters (mostly CW and RTTY with some talking stuff once or twice a
year). Also chase DX.

Love the amp - bought one after I did the review for CQ. Rigs are an IC
756ProIII and a K3 with mono banders for 10-40 and wires for 80/160. Set up
for SO2R contesting.

Have made several thousand Q's with this amp and also the review unit
(which was a different one). No smoke yet which is a good thing.

Getting set up for fully automated band and antenna switching and computer
logging with both radios.


73

Steve



------------------------------------

Yahoo! Groups Links

Re: New member

Al Ludwick / NN4ZZ
 

Steve,
Welcome to the group, it is small and not very active yet. (the amp just works, so that may be part of the reason). I enjoyed reading the CQ review, hopefully it will generate some more interest and awareness.

I'm anxiously awaiting the enhancement to provide a "remote control" program so I can view the status and control the amp from my PC. I know Mike is working on it and hope we hear more soon.

73, Al

--- In PrometheusDX2400@..., "steve_bolia" <sbolia@...> wrote:

Hi

I'm Steve, N8BJQ

I own unit #7 with the SO2R board and the switching PS. Pretty active contesters (mostly CW and RTTY with some talking stuff once or twice a year). Also chase DX.

Love the amp - bought one after I did the review for CQ. Rigs are an IC 756ProIII and a K3 with mono banders for 10-40 and wires for 80/160. Set up for SO2R contesting.

Have made several thousand Q's with this amp and also the review unit (which was a different one). No smoke yet which is a good thing.

Getting set up for fully automated band and antenna switching and computer logging with both radios.


73

Steve

New member

Steve Bolia
 

Hi

I'm Steve, N8BJQ

I own unit #7 with the SO2R board and the switching PS. Pretty active contesters (mostly CW and RTTY with some talking stuff once or twice a year). Also chase DX.

Love the amp - bought one after I did the review for CQ. Rigs are an IC 756ProIII and a K3 with mono banders for 10-40 and wires for 80/160. Set up for SO2R contesting.

Have made several thousand Q's with this amp and also the review unit (which was a different one). No smoke yet which is a good thing.

Getting set up for fully automated band and antenna switching and computer logging with both radios.


73

Steve

Re: CQ October 2010 --- Prometheus review

Steve Nance <snance@...>
 

Ok Al, understood.

 

73, Steve K5FR

 

From: PrometheusDX2400@... [mailto:PrometheusDX2400@...] On Behalf Of Al NN4ZZ
Sent: Friday, October 01, 2010 6:33 PM
To: PrometheusDX2400@...
Subject: Re: [PrometheusDX2400] CQ October 2010 --- Prometheus review

 




Hi Steve,

I don't think they actually publish an online version of the magazine.  I get the hard copy delivered and just posted the link so folks could see the cover and table of contents. 

 

sorry for the confusion.

 

73, Al

 

 

From: Steve Nance

Sent: Friday, October 01, 2010 6:54 PM

Subject: RE: [PrometheusDX2400] CQ October 2010 --- Prometheus review

 

 

Oops, need an ID and PWD to access it.

73, Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of NN4ZZ
Sent: Friday, October 01, 2010 5:21 PM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] CQ October 2010 --- Prometheus review

Check out the October 2010 edition of CQ magazine.

Steve Bolia, N8BJQ, has a full review of the DX-2400L1 "Prometheus"
amplifier from Dishtronix.

http://www.cq-amateur-radio.com/

Al, NN4ZZ

------------------------------------

Yahoo! Groups Links




Re: CQ October 2010 --- Prometheus review

Al Ludwick / NN4ZZ
 

Hi Steve,
I don't think they actually publish an online version of the magazine.  I get the hard copy delivered and just posted the link so folks could see the cover and table of contents. 
 
sorry for the confusion.
 
73, Al
 

Sent: Friday, October 01, 2010 6:54 PM
Subject: RE: [PrometheusDX2400] CQ October 2010 --- Prometheus review

 

Oops, need an ID and PWD to access it.

73, Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of NN4ZZ
Sent: Friday, October 01, 2010 5:21 PM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] CQ October 2010 --- Prometheus review

Check out the October 2010 edition of CQ magazine.

Steve Bolia, N8BJQ, has a full review of the DX-2400L1 "Prometheus"
amplifier from Dishtronix.

http://www.cq-amateur-radio.com/

Al, NN4ZZ

------------------------------------

Yahoo! Groups Links

Re: CQ October 2010 --- Prometheus review

Steve Nance <snance@...>
 

Oops, need an ID and PWD to access it.

73, Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of NN4ZZ
Sent: Friday, October 01, 2010 5:21 PM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] CQ October 2010 --- Prometheus review

Check out the October 2010 edition of CQ magazine.

Steve Bolia, N8BJQ, has a full review of the DX-2400L1 "Prometheus"
amplifier from Dishtronix.

http://www.cq-amateur-radio.com/

Al, NN4ZZ






------------------------------------

Yahoo! Groups Links

CQ October 2010 --- Prometheus review

Al Ludwick / NN4ZZ
 

Check out the October 2010 edition of CQ magazine.

Steve Bolia, N8BJQ, has a full review of the DX-2400L1 "Prometheus" amplifier from Dishtronix.

http://www.cq-amateur-radio.com/

Al, NN4ZZ

Short interconnect cables

Al Ludwick / NN4ZZ
 

Hi all,
I installed my new shorter RF Deck to Power supply interconnect cables today. Pix on my web page. This is a minor thing but I'm happy to have them. For the stacked configuration, I think it's a little neater.

The amp is working great!

The only other enhancement I'm looking forward to is the remote PC access so I don't have to reach over a few feet to press the bypass button. And so I can see the status of the front panel LEDs a little easier.

Regards, Al

Re: Fan Filters added

Steven M. \(Mike\) dishop
 

Hi Al,

 

Thank you for all your detailed write ups on your amplifier experience. I don’t know if this will make sense or not, but speaking as a design engineer there truly is no better feeling than to know someone appreciates your work. Personally speaking, DX2400 is the finest thing I have yet created in my engineering career and the thing I am most proud of. I started with absolutely nothing but a blank sheet of paper and set out to craft the absolutely finest legal limit plus amplifier that I could dream of without regard to cost or complexity. I thought it was quite an accomplishment to be amateur radio’s first 1500W+ solid state amplifier (patent pending), but believe it or not, it truly gives me even greater satisfaction to know you guys are really enjoying your amplifiers and that you are as happy with them as I am. It sort of tickles me even more to know that they only thing you don’t appreciate is the linear power supply front panel temperature which is easily solved as you have done, and which we are introducing as a running change.  FYI, the high voltage supply (and heat) shuts off if the unit is not keyed within a one hour interval. We implemented this not because of any concern over the front panel temperature but to save on energy consumption. I’m notorious for getting called away from the operating position for a telephone call or something and sometimes do not make it back until the next day!

 

You won’t notice much difference at all with the filters unless you are running continuous RTTY. In that event it might be good to add the desert fan kit.

 

Thanks and Best 73

 

Mike N8WFF

Re: Fan Filters added

Al Ludwick / NN4ZZ
 

Hi Mike,
Thanks for the update on the cables.
 
I noted that the filters would reduce the airflow in my write up so I was expecting to possibly see more cycling, higher temperature, longer cycle on time, or higher speed but so far nothing has changed that I've been able to notice (except it is a bit quieter).  I'm in an cool air conditioned room so maybe it would be different if the room was warmer.  But I guess it could also mean the fans just move a lot air.    
 
I left enough cable on my thermostat to move it around and I normally wouldn't just cable tie it either but it actually is pretty solid and seems to work perfectly in the current location.  Next time I have an occasion to open up the power supply I'll look at the other mounting locations.  I'm sure your kit will be much better, prototypes are never perfect.  I'll be sure to mention it and if you have a picture will post that too. 
 
The amp has been working great.  I just need more free time and sun spots!
 
Regards, Al
 
 
 

----- Original Message -----
Sent: Wednesday, August 26, 2009 5:20 PM
Subject: RE: [PrometheusDX2400] Re: Fan Filters added

 

Al,

We use stainless steel screws when fitting the filters. Keep in mind that
the filters do reduce airflow so you might see elevated temperatures or
consequentially higher fan speeds for a given operational load. Normally we
do not sell the filters without the desert cooling fan option which moves
more air at a higher sound volume when full on. For light duty there is no
noise increase.

I will make the additional thermostat modification available as a retrofit
kit to anyone interested. Price TBD. It will include new wiring. A new,
longer wire will solder too the diode heat sink thermostat and run to the
front of the unit where it will plug into a new PCB carrying the second
thermostat. A second wiring cable will run back from the new PCB to where
the current thermostat connector plugs in. The new PCB will mount on the
side near the electrolytic capacitors. Look at the existing screw holes. You
might try repositioning your thermostat over there to see what temperatures
you get on the front panel. I'm looking for a more rigid mount than your
arrangement as I'm not keen about having the thermostat only supported by
the wiring.

Your shorter cables should be on their way tomorrow or day after.

Best Regards - Mike N8WFF

Re: Fan Filters added

Steven M. \(Mike\) dishop
 

Al,

We use stainless steel screws when fitting the filters. Keep in mind that
the filters do reduce airflow so you might see elevated temperatures or
consequentially higher fan speeds for a given operational load. Normally we
do not sell the filters without the desert cooling fan option which moves
more air at a higher sound volume when full on. For light duty there is no
noise increase.

I will make the additional thermostat modification available as a retrofit
kit to anyone interested. Price TBD. It will include new wiring. A new,
longer wire will solder too the diode heat sink thermostat and run to the
front of the unit where it will plug into a new PCB carrying the second
thermostat. A second wiring cable will run back from the new PCB to where
the current thermostat connector plugs in. The new PCB will mount on the
side near the electrolytic capacitors. Look at the existing screw holes. You
might try repositioning your thermostat over there to see what temperatures
you get on the front panel. I'm looking for a more rigid mount than your
arrangement as I'm not keen about having the thermostat only supported by
the wiring.

Your shorter cables should be on their way tomorrow or day after.

Best Regards - Mike N8WFF

Re: Fan Filters added

baynor1 <dtreanor@...>
 

Al,
I finally figured-out my problem -- I'm using Windows Vista with Internet Explorer 8, and unless I turn-on "compatibility mode" all the recent new additions that you added to your Prometheus amp webpage, just don't show up!
Tks, Dewey

--- In PrometheusDX2400@..., "nn4zz" <al@...> wrote:

Dewey,
Here is the link directly to the section on the fans.

http://www.nn4zz.com/Prometheus.htm#Fan_Filters

The second picture shows the part numbers. If you still have trouble, let me know and I'll email the pictures to you directly.

Regards, Al


--- In PrometheusDX2400@..., "baynor1" <dtreanor@> wrote:

Al,
I carefully looked over your entire website and couldn't find any mention of the fans among the DX2400L1 photos and text or elsewhere. You mentioned that there were 5 fans. With 3 on the rear panel, I assume the other 2 are internal -- where specifically are they located?
What other options are there in the manual that don't show up on the Dishtronix website?
73, Dewey

--- In PrometheusDX2400@..., "nn4zz" <al@> wrote:

Dewey,
The mouser part numbers are listed with the pictures on my web page. But it's even easier than that. Dishtronix will provide them for you. They are listed in the manual as one of the options, so just drop Mike a note or give him a call.

73, Al


--- In PrometheusDX2400@..., "baynor1" <dtreanor@> wrote:

Al, My amp is on order, so I can't determine the fan P/N, and would like to have the filters on hand when amp arrives, due to effort that would be involved to remove the amp from station rack later-on. Would very much appreciate your providing the Mouser catalog filter kit P/N.
Tks/73, Dewey, KØSVX

--- In PrometheusDX2400@..., "Steve Nance" <snance@> wrote:

Thanks Al, more good info.

73,
Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of nn4zz
Sent: Tuesday, August 25, 2009 5:42 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Fan Filters added

The Prometheus has a total of 5 fans (1 on the power supply and 4 on the RF
deck). I have them all set to run only when needed but when all 5 are
running they are noticeable. They are not the loudest I've heard but
compared to my Alpha 87A they are louder. I'm running my amp regularly now
but eventually will go back to my usual routine of only using it when I need
to. Generally that's chasing a rare one and more often than not I'm using
headphones so the fan noise is not really a problem.

Dishtronix offers the optional fan filters. They help keep dust out if you
are running in a dusty environment and also reduce fan noise. I didn't
order them initially but decided to get a set to see the difference.
Mouser carries the same fan and filter kits, so ordered from them.

Pix and additional info on my web page:

http://www.nn4zz.com/Prometheus.htm

73, Al

Re: Fan Filters added

Al Ludwick / NN4ZZ
 

Dewey,
Here is the link directly to the section on the fans.

http://www.nn4zz.com/Prometheus.htm#Fan_Filters

The second picture shows the part numbers. If you still have trouble, let me know and I'll email the pictures to you directly.

Regards, Al

--- In PrometheusDX2400@..., "baynor1" <dtreanor@...> wrote:

Al,
I carefully looked over your entire website and couldn't find any mention of the fans among the DX2400L1 photos and text or elsewhere. You mentioned that there were 5 fans. With 3 on the rear panel, I assume the other 2 are internal -- where specifically are they located?
What other options are there in the manual that don't show up on the Dishtronix website?
73, Dewey

--- In PrometheusDX2400@..., "nn4zz" <al@> wrote:

Dewey,
The mouser part numbers are listed with the pictures on my web page. But it's even easier than that. Dishtronix will provide them for you. They are listed in the manual as one of the options, so just drop Mike a note or give him a call.

73, Al


--- In PrometheusDX2400@..., "baynor1" <dtreanor@> wrote:

Al, My amp is on order, so I can't determine the fan P/N, and would like to have the filters on hand when amp arrives, due to effort that would be involved to remove the amp from station rack later-on. Would very much appreciate your providing the Mouser catalog filter kit P/N.
Tks/73, Dewey, KØSVX

--- In PrometheusDX2400@..., "Steve Nance" <snance@> wrote:

Thanks Al, more good info.

73,
Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of nn4zz
Sent: Tuesday, August 25, 2009 5:42 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Fan Filters added

The Prometheus has a total of 5 fans (1 on the power supply and 4 on the RF
deck). I have them all set to run only when needed but when all 5 are
running they are noticeable. They are not the loudest I've heard but
compared to my Alpha 87A they are louder. I'm running my amp regularly now
but eventually will go back to my usual routine of only using it when I need
to. Generally that's chasing a rare one and more often than not I'm using
headphones so the fan noise is not really a problem.

Dishtronix offers the optional fan filters. They help keep dust out if you
are running in a dusty environment and also reduce fan noise. I didn't
order them initially but decided to get a set to see the difference.
Mouser carries the same fan and filter kits, so ordered from them.

Pix and additional info on my web page:

http://www.nn4zz.com/Prometheus.htm

73, Al

Re: Fan Filters added

baynor1 <dtreanor@...>
 

Al,
I carefully looked over your entire website and couldn't find any mention of the fans among the DX2400L1 photos and text or elsewhere. You mentioned that there were 5 fans. With 3 on the rear panel, I assume the other 2 are internal -- where specifically are they located?
What other options are there in the manual that don't show up on the Dishtronix website?
73, Dewey

--- In PrometheusDX2400@..., "nn4zz" <al@...> wrote:

Dewey,
The mouser part numbers are listed with the pictures on my web page. But it's even easier than that. Dishtronix will provide them for you. They are listed in the manual as one of the options, so just drop Mike a note or give him a call.

73, Al


--- In PrometheusDX2400@..., "baynor1" <dtreanor@> wrote:

Al, My amp is on order, so I can't determine the fan P/N, and would like to have the filters on hand when amp arrives, due to effort that would be involved to remove the amp from station rack later-on. Would very much appreciate your providing the Mouser catalog filter kit P/N.
Tks/73, Dewey, KØSVX

--- In PrometheusDX2400@..., "Steve Nance" <snance@> wrote:

Thanks Al, more good info.

73,
Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of nn4zz
Sent: Tuesday, August 25, 2009 5:42 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Fan Filters added

The Prometheus has a total of 5 fans (1 on the power supply and 4 on the RF
deck). I have them all set to run only when needed but when all 5 are
running they are noticeable. They are not the loudest I've heard but
compared to my Alpha 87A they are louder. I'm running my amp regularly now
but eventually will go back to my usual routine of only using it when I need
to. Generally that's chasing a rare one and more often than not I'm using
headphones so the fan noise is not really a problem.

Dishtronix offers the optional fan filters. They help keep dust out if you
are running in a dusty environment and also reduce fan noise. I didn't
order them initially but decided to get a set to see the difference.
Mouser carries the same fan and filter kits, so ordered from them.

Pix and additional info on my web page:

http://www.nn4zz.com/Prometheus.htm

73, Al

Re: Fan Filters added

Al Ludwick / NN4ZZ
 

Dewey,
The mouser part numbers are listed with the pictures on my web page. But it's even easier than that. Dishtronix will provide them for you. They are listed in the manual as one of the options, so just drop Mike a note or give him a call.

73, Al

--- In PrometheusDX2400@..., "baynor1" <dtreanor@...> wrote:

Al, My amp is on order, so I can't determine the fan P/N, and would like to have the filters on hand when amp arrives, due to effort that would be involved to remove the amp from station rack later-on. Would very much appreciate your providing the Mouser catalog filter kit P/N.
Tks/73, Dewey, KØSVX

--- In PrometheusDX2400@..., "Steve Nance" <snance@> wrote:

Thanks Al, more good info.

73,
Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of nn4zz
Sent: Tuesday, August 25, 2009 5:42 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Fan Filters added

The Prometheus has a total of 5 fans (1 on the power supply and 4 on the RF
deck). I have them all set to run only when needed but when all 5 are
running they are noticeable. They are not the loudest I've heard but
compared to my Alpha 87A they are louder. I'm running my amp regularly now
but eventually will go back to my usual routine of only using it when I need
to. Generally that's chasing a rare one and more often than not I'm using
headphones so the fan noise is not really a problem.

Dishtronix offers the optional fan filters. They help keep dust out if you
are running in a dusty environment and also reduce fan noise. I didn't
order them initially but decided to get a set to see the difference.
Mouser carries the same fan and filter kits, so ordered from them.

Pix and additional info on my web page:

http://www.nn4zz.com/Prometheus.htm

73, Al

Re: Fan Filters added

baynor1 <dtreanor@...>
 

Al, My amp is on order, so I can't determine the fan P/N, and would like to have the filters on hand when amp arrives, due to effort that would be involved to remove the amp from station rack later-on. Would very much appreciate your providing the Mouser catalog filter kit P/N.
Tks/73, Dewey, KØSVX

--- In PrometheusDX2400@..., "Steve Nance" <snance@...> wrote:

Thanks Al, more good info.

73,
Steve K5FR

-----Original Message-----
From: PrometheusDX2400@...
[mailto:PrometheusDX2400@...] On Behalf Of nn4zz
Sent: Tuesday, August 25, 2009 5:42 AM
To: PrometheusDX2400@...
Subject: [PrometheusDX2400] Fan Filters added

The Prometheus has a total of 5 fans (1 on the power supply and 4 on the RF
deck). I have them all set to run only when needed but when all 5 are
running they are noticeable. They are not the loudest I've heard but
compared to my Alpha 87A they are louder. I'm running my amp regularly now
but eventually will go back to my usual routine of only using it when I need
to. Generally that's chasing a rare one and more often than not I'm using
headphones so the fan noise is not really a problem.

Dishtronix offers the optional fan filters. They help keep dust out if you
are running in a dusty environment and also reduce fan noise. I didn't
order them initially but decided to get a set to see the difference.
Mouser carries the same fan and filter kits, so ordered from them.

Pix and additional info on my web page:

http://www.nn4zz.com/Prometheus.htm

73, Al