It may be possible , IEEE cards for PC are available on ebay , originally it was complimentary to HP basic, and used the HP range of PC's with addressed card slots .. allowed you to construct a autom
On 5/12/2012 9:41 PM, Andy Talbot wrote: A JFET switch is probably the simplest. Uses a P Channel device like a 2N3820 so it can be controlled with a positive voltage. +V is device off, 0V is switche
Thanks for this, Gary - yes, I've given up the idea of using the IEEE488 interface - external switching it will be. Still looking for that book, incidentally - I haven't forgotten. Martin GW3UCJ. ~~~
Dear Martin, LF Group, Provided you were happy with simple on/off keying, i.e. QRSS rather than DFCW or the various mFSK modes, there is no need to interface the sig gen to the PC. You could just con
Well, what you're saying could sound simple to you, Graham, but a nice keyed relay sounds a lot simpler to a Silver Surfer brought up on 6V6s and 807s! Martin GW3UCJ. ~~~~~~~~~~~~~~~~~~~~ It may be p
R Martin Well that's the problem, we all know what the kit can do , but there are only a few who can tap the keys and make it perform .. Like Jim mentioned , other modes , now , I think the read/refr
I'll use transistor switching really, Graham - the relay is metaphorical... I can just about manage that...solid state 12AX7, no problem! Martin GW3UCJ. ~~~~~~~~~~~~~~~ Well that's the problem, we al
I've got a R&S APN62 sig genny, 1Hz to 260Hz synthesised, which I'm thinking of using as a signal source for a 137kHz TX. I would like to key this from a QRSS program on a computer. The only control
R Martin Telegraph relay ? relay spring balance and adjusting tools ? (I like the TTL gate hi) 73 -G. -- From: "Martin Evans" <[email protected]> Sent: Saturday, May 12, 2012 8:36 PM To:
Thanks Andy. I expected this to be the case, but hope springs eternal! OK, back to the drawing board. Martin GW3UCJ. ~~~~~~~~~~~~~~~~~~~~~~~~~ It 'would' be possible if you :- 1) Know the command's n
If you use a DDS of the AD9850/51, and probably the AD9832 type, there is a very neat way of amplitude keying them. Place an NPN transistor in series with the D/A current setting resistor, and a smal
A JFET switch is probably the simplest. Uses a P Channel device like a 2N3820 so it can be controlled with a positive voltage. +V is device off, 0V is switched on. Which sounds a bit weird to visuali
Thanks Jim - yes, this is what I'll do. I just thought that keying the sig gen sounded a bit more elegant. And I need only on-off keying, for CW and maybe OPERA, so relay keying it will be. Martin GW
It 'would' be possible if you :- 1) Know the command's needed to control the sig. gen That will be in the equipment manual 2) Have an IEE488 interface on your PC, or a USB/IEE488 or whatever, adapter
Hi Martin, LF, I have used relay keying using qrs.exe to key the output from my DDS VFO & it was a very simple, stable & reliable method. The DDS VFO remained on all the time. seems to me the way to
