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Radioshack DX-440, size: 880 KB
Realistic DX 440
User reviews and opinions
|nonoose||3:22pm on Thursday, October 7th, 2010|
|Main Uses Of This Product would have to be web browsing and music,overall it is a great investment . Comfortable Keyboard, Fast, Lightweight. i use this for reading my emails serfing the web talking to family and friends. great cam and mic for camming with family! Adequate Storage.|
|jayhr||1:32pm on Sunday, August 8th, 2010|
|My Best Pal I bought this laptop after researching a month on internet. And now I have been using it for a year with no complains Alhamdullilah. HP laptop G60-215 A good compromise laptop though its Compaq equivalent is cheaper.|
|marco1320||10:22pm on Monday, July 12th, 2010|
|Upon receiving the laptop, at first I was very excited. My Father purchased it for me as a graduation present. As soon as I downloaded Skype. The features of this laptop are outstanding. The HDMI port is a major bonus. The only problem I have had so far is the screen clicks when it opens.|
|migo||7:14am on Sunday, June 13th, 2010|
|I purchased my HP G60-445DX Notebook PC in June of 2009, for around $400. I bought it at Best Buy after looking around at computers elsewhere.|
|zimster||8:22am on Friday, June 11th, 2010|
|Well, it all started when I was buying a laptop for high school, I wanted a MacBook Pro. I guess I really like my laptop, enough to gi... I like the large screen, the very simple fact that it works.|
|leesobo||2:01pm on Sunday, May 30th, 2010|
|This laptop took a lot of tweaking to make me happy, but once I did, I was very happy with it. There is a webcam that auto adjusts brightness. Flimsy case, off-center touchpad, touchpad keys that are difficult to feel (and which my fingers miss about 1/3 of the time).|
|Abhijeet||2:35am on Monday, March 29th, 2010|
|fan is verry loud battery lasts 2-2. i bought this laptop in january 2010, it has never given me any trouble its super fast and super easy to use!! its definately worth the money! I have just set up my new laptop for my home office and so far it is fantastic! Great Value.|
Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.
Realistic DX-440 Receiver Plus External Attenuator A while back I bought a used DX-440 shortwave receiver. The receiver included the longwave band and the reason why I wanted it. Unfortunately it worked poorly on longwave due to AM broadcast interference.
I now use it almost exclusively to monitor the 20 meter AM frequency, 14.286 MHz. There was a problem here also. When connected to a decent outside antenna it pretty much died due to front end overload from other signals. The receiver doesn't appear to have any front end selectivity. Turning down the the RF gain helped a little but not much. I experimented using a 50 step attenuator that can be set in 1 dB increments at the antenna input to determine any performance improvements. In my case 15 dB of attenuation seemed to be a good compromise where the interference almost went away while still providing reasonable sensitivity. On longwave and the AM broadcast band only the internal antenna is used therefore an attenuator at the external antenna connector will not work. I built up a 15 dB attenuator (PAD) using standard Watt resistors. I installed them in an old Motorola Motrac Two-Way radio low pass filter box shown above. Being H.F. any available container should work. The resistor values used are not exact due to the calculated values are not available when 1
standard 5 % or 10 % resistors are used. The resistors values were calculated using 50 input and output impedances. I don't know the input impedance of the DX-440. It probably varies over frequency. Anyway, this doesn't seem to be to critical. Some type of preselector probably would have been a better choice but the attenuator is simple to build. Shown below are drawings of 15 dB 50 PI and TEE attenuators. Both will work and the two are shown so that the closes available resistor values can be used. For different values of attenuation a Google search will lead you to different on-line attenuator calculators.
50 OHM 15 dB PI ATTENUATOR
50 OHM 15 dB TEE ATTENUATOR
Initially I was considering building the attenuator inside the DX-440 case. After looking inside I decided it would be a better idea to build it externally. In my opinion this radio is not built very well and mucking around the inside may leave it inoperable. 2
With the external attenuation the receiver actually does a pretty good job of receiving AM on 20 meters. Adding external attenuation may help other receivers with similar problems. Home page http://www.ve6kq.com/
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