Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Modern signal generators
#1

As most of you know, I invested in a Siglent SDG1032X function generator a few years ago after using an old Clough-Brengle for decades, then a B+K 4040 like John B's for a while.

Pros of the Siglent: Direct digital readout, no drifting.
Con of the Siglent: Output level too high for typical vintage radios, must be reduced to a usable level with the use of inline BNC attenuators. I am using three such attenuators, a 20 dB, another 20 dB, and a 14 dB to reduce the output signal by 54 dB. This has solved my "signal too strong" issue.

While I liked my B+K 4040, I did not like the fact that it, too, drifted in frequency while in use. Of course, the old 1930s Clough-Brengle drifted badly.

With the setup I have now, I am able to give my radios the best alignments possible. I recently had my RCA C15-3 console chassis out for a tuneup. The IF alignment was good already, but I was able to improve the RF alignment a good deal.

I'll ask this question - do the HP generators produce a low level signal usable in vintage receivers without overloading them?

--
Ron Ramirez
Ferdinand IN
#2

The sole problem with mine is, it is about 50 lbs or so, and moving it to the table and back poses the risk of back problems.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
#3

Ron,

The HP generators I had to leave behind would easily go below the thresholds of any radio I worked on (-134dB?)
#4

morzh Wrote:The sole problem with mine is, it is about 50 lbs or so

50 lbs? That's a lightweight. My General Radio Type 805-C Standard Signal Generator weighs 117-1/2 lbs. I like to joke that if a tornado takes my house the workbench will still be there because of the 805-C holding it down.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
#5

Ron Ramirez Wrote:I am using three such attenuators, a 20 dB, another 20 dB, and a 14 dB to reduce the output signal by 54 dB.

Ron - The HP 355C (0-12dB in 1 dB steps) and 355D (0 to 120dB in 10dB steps) step attenuators are more elegant solutions. I have long owned both, largely for use with GR unit oscillators which lack step attenuators.


Ron Ramirez Wrote:... do the HP generators produce a low level signal usable in vintage receivers without overloading them?

They do - around less than 0.1 microvolt into 50 ohms is not unusual.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM
B&K 1077B no video
Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM
B&K 1077B no video
Hello Tim, Here is a link to restoration of one on Phil's old radios site ! Sincerely Richard bk1077bradiorich — 09:01 PM
6TPZ and 5TPO Radio Help
I'm a little befuddled on this one. Should X5 and X4 be tied together like this?  It looks like someone added this at so...R3Sons — 07:33 PM

[-]
Who's Online
There are currently no members online.

>