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:
[-]
Recent Posts
Philco 46-480 Electronic Restoration
I forgot to make mention of it the other day, but last week I corrected another error on my schematic (applies to both R...jrblasde — 09:27 PM
Gloritone 27 Radio
I have a model 27 that someone painted the cabinet brown. I've been trying to sell it for awhile but the cabinet paint m...Jim Dutridge — 02:30 PM
Restoring Philco 96
Joseph Yeah. The situaction is complicated by me living with my family in NJ while mom is in FL. Were it not for my ...morzh — 10:55 AM
Restoring Philco 96
Best of wishes for your mother. I hope she recovers well. My mother struggles with sciatic pain as well, so I am familia...jrblasde — 10:41 AM
Restoring Philco 96
Well, because I am away, I cannot check it. Hope mom becomes better enough for me to get back. I think I will be here f...morzh — 10:27 AM
Restoring Philco 96
Nice find! I hope it completes your console.jrblasde — 08:45 AM
Gloritone 27 Radio
Hello john, That, is the first time I have have seen or heard of that brand and model. Welcome to the party !! Sincer...radiorich — 08:08 AM
370 Norman Bel Geddes trim pieces
Thank you! I’ll probably use the half-round molding and tone it to match the original. Thanks for the replies!Max T — 06:34 AM
Gloritone 27 Radio
I'm kind of late to this thread, but Buzz1151 has a 3 part restore series on the model 27: A little bit of extra t...Eliot Ness — 05:48 AM
370 Norman Bel Geddes trim pieces
You can get half-round moulding in various diameters at any home improvement store. That way the flat edge is uniform. ...GarySP — 12:03 AM

[-]
Who's Online
There are currently 1588 online users. [Complete List]
» 1 Member(s) | 1587 Guest(s)
Avatar

>