Martyn Smith wrote: > I read with interest about the new 10 MHz distribution amplifier. > > But I agree with everyone, it's the specs that are missing that are > important. > > But I wanted to take one comment up about AGC. > > It depends how the AGC is done, there are some really poor examples for sale. > My company makes a nice distribution amplifier and we do have AGC. The nice > thing here is that a +7 dBm input (e.g PRS10 output) will give you up to +13 > dBm output. > > Despite the AGC we still achieve good phase noise (-135 dBc/Hz @ 1 Hz with > a -168 dBc noise floor) together with 130 dB isolation and 10 ps/C phase > stability. > > The phase noise at 1Hz offset is about 15dB or so higher than the state of the art. The effect of AGC should be most noticeable at low offsets. A phase tempco of 10ps/C is a bit for high precision work. > I suspect this low cost unit has a -140 or -150 dBc noise floor. > > But our unit costs a lot more than this low cost design, so maybe I'm not > being fair in comparing. > > www.ptsyst.com/DA1-100-10-B.pdf has all our specifications. > > I could probably talk our sales manager in a once off big discount for time > nuts readers, but I suspect it would still be out of the range of amateurs. > > Send me an email if you are interested ([EMAIL PROTECTED]) > > Martyn > Bruce
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