If component level data is available, look at the diagram and parts list to determine the type of DC protection.
Cheers!
Bruce
Quoting Radu Bogdan Dicher <vondicher@...>:
toggle quoted message
Show quoted text
Honestly, probably worth its separate topic is how many of these units have
AC and/or DC protection on their output. DC - far more important in my
book.
In a hobby environment of experimenting and tinkering with design, repairs,
alignments, etc., this seems a pretty critical selection criteria. As a
hobbyist, once you spend a few hundred bucks on your unit (and probably
weeks of hunting on ePay, 100 miles drive to hamfest, etc. etc.), disabling
it for an undetermined length of time, due to an inadvertent connection is
a huge nuisance. Maybe this will become less of a problem than I tend to
see it right now - I have not yet disabled any of my units, ever, because
of this - or maybe I just have to keep a DC block attached to its output at
all times, but I still feel it's good insurance.
- HP 8643A/8644B: "50W reverse power protection" (is this what I think
it is?). This is in *Table 2-1. Specifications (2 of 4)*.
- HP 8662A: nothing seems to indicate such protection.
- (non-sweeping): HP 8657A/B: "Reverse power protection to maximum
output frequency: 50W; Maximum DC voltage: A: 50V; B: 25V (p.3 in
*Profile*).
- Agilent E4438C: no such spec I can find. BTW, this guy seems to have
everything I may want and more. It goes for one more digit than what I'm
looking for, $-wise.
- (non-sweeping): HP 8648: "Reverse power protection" 50W into 50 ohms
under 2GHz (*Specifications*, p.4-4)
Radu.
On Thu, Mar 17, 2022 at 8:00 PM Radu Dicher <vondicher@...> wrote:
Ruben,
You're right, there's just two sweepers on that list, which complies with
my original requirements.
But I decided to keep the list a bit "looser" than how I started it;
besides, there's just two sweepers that were put forth and didn't get
disqualified for various reasons. I'd be very happy to hear of other
candidates, but maybe these two are the only ones that warrant being on the
shortlist.
Out of those two, the 8643/8644 has a bit of an edge, in no small way due
to their apparent less clout (at least at the time of this publication ;)),
so prices seem to be a bit better than the 8662. Also, there's about 15lbs
worth less bricks in it (there's some entire, respectable units that weigh
as much as the difference!). Specs are very similar.
Still evaluating and still inviting more recommendations!
Thank you all very much for your input.
Radu.
On Thu, Mar 17, 2022 at 12:50 PM Lothar baier <Lothar@...>
wrote:
Not sure about the newer IFR/aeroflex stuff but the marconi stuff I
worked on back at tucker was horrible in terms of signal quality and
reliability
On Mar 17, 2022, at 14:33, RubenRubio via groups.io <rubenrb2019=
[email protected]> wrote:
?
Radu
At first you want to sweep, and none of those, except for 8662A and
8643A, can sweep.
Regards,
Ruben
