I am measuring at 7 MHz and I have not thought of a handy way to verify the calibration of the instrument. I will give it some thought. I will get back to you...
I have designed a Band Pass Filter Board. The board is 1.5" by 3.5". The layout includes 6 bandpass filters that can be up to 7 pole elliptic. The filters...
I've been somewhat reluctant to use try the inexpensive and low power AD9834 part because the max output was 25Mhz (50Mhz MCLK). Turns out they now have a...
I just built up an 80m softrock lite 80m kit. The sensitivity of the receiver seems to be very low. A very strong signal from my signal generator into my ...
Tim...~ All softrock kits nee a 50Ohm Antenna. But yes you are pointing to the right culprit.It may as well be the transformer. Check that. As a side...
Hi Tim, Please check the connections at T1. If T1 is not wired correctly the sensitivity of the receiver will be greatly reduced. The builder's notes give...
Tim, Make sure you have scraped the enamel coating of the wire ends. Also look to see you have solder the wire ends into the correct holes on the board. I know...
Hi everyone I reached the first resistance test and the reading on the 5v line is 695 ohm using 2 meters fluke 87 and my PC interface radio shack meter. Q1 Q7...
I have finished adding resistors and diodes to the board and have not yet layed in any transistors or inductors. I did the measurements and got: - for the 12V...
Hi Steve, Your resistance reading is enough off that I think there may be a resistor or two not installed properly. Please look carefully at the mounting...
Hi Robby, The 993 ohms sounds a bit high but may come down when the transistors are added to the board. I will check but I am pretty sure your missing TO18...
Hi Tony After looking at the resistors R15 and R16 I put them in the wrong direction. Removing them now and installing them properly. Thanks Steve KB4MXO ... ...
... Bill, Correct, unless it's QRPp! The smd coils will take only a few hundred mA and the switches are only rated at 3.3V. I have a design I did a while ago...
Yup, R15 and R16 got me too the first time around. Of course the markings are right there on the board, for some reason the parts just wanted to go in the...
Hi Phil I figured someone ran into this problem and had the fix. I now have the 814 ohm reading on the 5v bus. Its a blast to build this board. Steve Kb4mxo ...
Hi- Are you still open to assemble a kit? I have a 10.7 Softrock I need help with, and I can have Tony ship to you if you're still available. I have no hope...
The connections are good. The instructions are just the teeniest bit vague. Should one of the ends of the bifilar pair be soldered together and used as the...
On Sunday 01 July 2007 16:29, scott schoech wrote: Oh golly, you aren't alone in having to try multiple times to get things right. I've been doing this for...
As you approach the specified OpAmp Gain Bandwidth, how does the OpAmp react ? Rfb/Rg no longer specifies the OpAmp gain (less) ? The OpAmp becomes less...
Kees, The gain bandwidth product is a constant for any opamp. You have maximum BW at Unity Gain and Maximum Gain at a very Narrow Bandwidth. Stability is...
... Kees, The OpAmp Gain Bandwidth is the frequency at which the amplifier gain drops to unity. No combination of Rfb/Rg resistors can make the gain any...
... Only one wire goes through each of the six circuit board holes. Make sure that you have marked the primary winding with spray paint or something like a...
Thanks for the response Bill. I was just wondering what happens if you exceed the GBW ....say you have a frequency range into the OpAmp and a gain which when...
I should say "try to exceed" the GBW......... -- "Kees & Sandy" <windy10605@...> wrote: Thanks for the response Bill. I was just wondering what happens if...
Thanks for the response, Milt. I think that's basically what I was saying...... The GBW is the max frequency for a gain of 1, you can also max out at that...
Attached is a photo of a Softrock Light transformer I made, I used a little clear gelled or thickened Acrylic Cement to hold the wires in place, it drys within...
Yup, me too. Mine is complete however I have no phone jack plugs :/ Further testing and use will have to wait until tomorrow ... awaiting anxiously, Phil,...
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