Are more of these becoming available ? A lot have been bought up by microwave operators recently. The best way to use these it take out the oscillator module which runs off 12 Volts and use that indi
The ones available from the Microwave Component service were 35 - 40 deg units. These were just about OK. for the normal 20 deg temperature crystal although a bit close to the turnover as you say. Ta
Thanks for that, you've just saved me some work. I'm playing with a TDA2005 bridge audio amplifier for 10 watts off a 12v rail (since I had one spare), but that older device is a bit prone to instabi
Another problem with soundcards is that of timebase accuracy, and in some cases even stability. Many cases of severe errors were identified by G3PLX during the development of PSK31 In the better card
There is an article on kites for lifting antennas in last month's (or it may be the month before) QST. It shows a design for a simple to make, serious lifting power kite. Can't remember the type off
What are the parameters for DFCW, or where are they specified. I want to write some software to control my AD9850 DDS source (may be applicable to your 9832 source as well Dave) and might as well inc
I do not intend to include anything in the DDS PIC firmware other than an ability to translate ASCII commnads into control words, and optionally store the settings to EEPROM for instant return to the
Theoreticaly you can gain 5.2dB by going from 3 to 10 sec. dot length. sample rate. Rik Only if the resolution of the waterfall analysis software is 3 times less. Does Spectran use the same windowing
signals It has to be assumed you know the operating frequency beforehand to the required accuracy - being able to adjust to within 1 Hz should be trivial at these frequencies where it is even difficu
Having a board with an uncommitted PIC means that the same hardware can be used in any way that the user wants just by re-writing the firmware. I was going to use a normal 18 pin DIP package rather t
Just a thought. Who uses these transmissions at LF and why - especially from central London. The freq is to high for (alleged) underwater communications and doesn't offer much in the way of long dist
The static crashes are only " 20dB over 9" for the few microseconds while they are happening. When using Spectran etc. try turning off the AGC completely and just allow the static crashes to overload
Quest que c'est les mots "balise" et "salve" ? 25 years since I learnt any French ! Andy G4JNT -- From: mv tsi[SMTP:[email protected]] Reply To: [email protected] Sent: 2000-05-15 12:56 T
Referring to John KD4IDY's note - I cannot help but feel a bit uneasy about the use of class D amplifiers followed by conventional shunt C series L pi-section filters - although the designs using the
I use a Racal RA1792. Gradually becoming available on the surplus market now, at prices coming down from 'silly'. They started at £1000 a few years ago but are now appearing at £400- £500 and ought t
Marco et al .. I feel cheated - everyone else seems to have 1 Hz steps :-( By IF passband tuning, do you mean the use of the 1kHz and 300 Hz filters on SSB ? For a time before getting an IC746 transc
Not sure if it is the same sort of Litz wire you mean, but I have a few pieces of cotton (or similar) covered wire recovered from transformers making up an ancient ultrasonic cleaner. With this I jus
For a very good book on DSP look at WWW.DSPGUIDE.COM Title "The Scientist and Engineer's Guide to Digital Signal Processing" by Steven W Smith To quote from the preface : "This book was written for S
I am considering bulk manufacture of a Printed Circuit Board for the AD9850 DDS chip. The design has already been tested and includes the DDS, output filter, voltage regulator and a 16F84 PIC. Reside
So far I have had 15 replies expressing interest in the DDS source board I am developing, which is almost certainly enough to warrant a commercial manufacturing run. As the PCB layout has been improv
