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
Jackson 715 not working
Mrfixr55, its working now. I cleaned the switches and sockets with spray cleaner. Thanks for helping on this one.daveone23 — 06:26 PM
Jackson 715 not working
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM
HiFi (Chifi) tube amp build - but my own design.
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM
Jackson 715 not working
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM
Restoring Philco 37-604C
Yep. F5 is green, D5 is Red. Red is Bad. Green is Clean.morzh — 01:30 PM
Jackson 715 not working
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM
Restoring Philco 37-604C
(Insert Homer Simpson "DOPF" Here.) When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM
Philco 91 Speaker Replacement
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil. It wo...morzh — 08:44 AM
Philco 91 Speaker Replacement
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM
Philco 91 Speaker Replacement
As Rod said, it is OK to use a fitting speaker, and then look for an original one. If you buy a Hammond 125 output tr...morzh — 08:15 AM

[-]
Who's Online
There are currently 5272 online users. [Complete List]
» 2 Member(s) | 5270 Guest(s)
AvatarAvatar

>