1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
HEATHKIT SG-8 WON'T MODULATE FREQUENCY
RodB
Phorum Expert
*****
Posts: 894
Threads: 37
Joined: Feb 2015
City: Roseville, MN
#7

01-19-2021, 05:15 PM
With the scope set to 2ms, one complete cycle is a little more than 1.5 divisions making it around 350Hz. Close enough for government work. But you should replace the caps and bad resistors to get rid of that ripple and maybe get closer to 400Hz.
(This post was last modified: 01-19-2021, 05:16 PM by RodB.)
Find
« Next Oldest | Next Newest »


Messages In This Thread
RE: HEATHKIT SG-8 WON'T MODULATE FREQUENCY - by RodB - 01-19-2021, 05:15 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM
40-150 General questions
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM
40-150 General questions
It's most likely a part number. Most of Philco part numbers are in that format. I looked at the parts list for this mode...RodB — 08:10 AM
40-150 General questions
Hi Kevin, No, I don't but I like your Quote about being a good electrician. The way I look at it is "The fact ...MrFixr55 — 08:06 AM
Philco 38-7 Speaker
7K should be fine. While not a perfect match (This transformer is meant for 6V6 tubes), Antique Electronic Supply (AES)...MrFixr55 — 08:03 AM
40-150 General questions
I discovered a stamp on the underside of the breadboard on my Philco 40-150. It is"56-1417' in black ink with numbe...Kevin_D — 07:14 AM
Philco 38-7 Speaker
FYI the Impedance of the HR20 (the one I have) secondary of the audio transformer is 5 ohms. The 38-7XX speaker is suppo...tludka — 04:22 PM
Philco 38-7 Speaker
Yeah, don't use the transformer currently on the H-20 (Dopf, I thought "H20, is that new technology, a speaker usin...MrFixr55 — 03:51 PM

[-]
Who's Online
There are currently 2213 online users. [Complete List]
» 1 Member(s) | 2212 Guest(s)
Avatar

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment