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'Signal generators - Agilent 33220A or Tek AFG3021B'
2008\07\11@091718 by Alan B. Pearce

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>Most of what I'll be using it for is <20MHz or so RF testing, bandwidth
>tests / frequency response of amplifiers, that sort of thing. I'm also
>open to suggestions of similar equipment from other manufacturers...

Keithley and Thurlbey Thandar are both in this market. IIRC you have already
bought a Tek DPO from TTi, so give them another shout. Otherwise Keithley
have a range of RF generation gear, they appear to have been quietly getting
stronger in this area, as well as having some nifty little booklets and CDs
on doing RF measurements. I haven't been keeping tabs on precisely what they
have, but from glancing through the leaflets that come across my desk, they
would be worth a look.

Probably also worth looking at Yokogawa, they seem to be the main Japanese
supplier of good quality instruments.

2008\07\14@172034 by Philip Pemberton

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Alan B. Pearce wrote:
> Keithley and Thurlbey Thandar are both in this market. IIRC you have already
> bought a Tek DPO from TTi, so give them another shout. Otherwise Keithley
> have a range of RF generation gear, they appear to have been quietly getting
> stronger in this area, as well as having some nifty little booklets and CDs
> on doing RF measurements.

For what it's worth, it's not specifically RF I'm looking for -- just the
modulation schemes.

For instance I'm after phase modulation (BPSK) for the Radio4 timecode
receiver. The plan being to get the PLL to lock onto a "perfect" signal, then
work on the RF front-end and filters later.

It's still a toss-up between the Tek and the Agilent though -- the Tek will go
to 25MHz and has a dual-channel version. The Agilent is better specced for
interfacing -- USB, LAN and GPIB as standard (the Tek just has USB; you only
get GPIB and LAN on the 100MHz and 200MHz versions).

The Thandar generators are nice, but the lack of any real modulation schemes
makes them little better than the Hameg. The sequence/loop mode on their
generators looks useful though, but the price/performance ratio seems a little
poor. I suppose I shouldn't really be comparing a DDS against a variable-clock
generator though.

I think I'm going to have a word with a few Tek distributors over the next few
days. Probably TTi first.

> Probably also worth looking at Yokogawa, they seem to be the main Japanese
> supplier of good quality instruments.

No price list on the website, which I take to mean "if you have to ask, you
can't afford it"... That's proven to be a fairly accurate assumption in the past.

Thanks,
--
Phil.
spam_OUTpiclistTakeThisOuTspamphilpem.me.uk
http://www.philpem.me.uk/

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