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{{TM500 | mfg=Tektronix | type=TG501 | function=time mark generator | class=pulse generator | image=Tek tg501 on.JPG | introduced=1974 | discontinued=1995 |
{{TM500 | mfg=Tektronix | type=TG501 | function=time-mark generator | class=pulse generator | image=Tek tg501 on.JPG | introduced=1974 | discontinued=1995 |
designers= |manuals=
manuals=
* [http://w140.com/smb/TG501_SM.pdf Tektronix TG501 Manual (OCR, PDF)]
'''TG501'''
* [[Media:TG501 schematics.pdf|Tektronix TG501 Schematics (stitched, PDF)]]
* [[Media:070-1576-00.pdf|TG501 Manual 070-1576-00]]
* [[Media:070-1576-02.pdf|TG501 Manual 070-1576-02]] (OCR, stitched schematics)
 
* [[Media:050-1425-02.pdf|TG501 Product Mod 050-1425-02]]
* [[Media:TG501 schematics.pdf|TG501 Schematics, stitched]]
 
'''TG501A'''
* [[Media:070-7373-00.pdf|TG501A Manual 070-7373-00]]
}}
}}
* Option 01 adds a 5MHz tempature-compensated crystal oscillator (Y50), and a TTL decade counter (U50) for a stable, precise internal clock.
There is also a TG501A.
There is also a TG501A.


Note the [http://www.eevblog.com/forum/repair/tektronix-tg501-out-put-problem/ output must be terminated into 50 Ω] or there may be no signal at all.
Note the [https://www.eevblog.com/forum/repair/tektronix-tg501-out-put-problem/ output must be terminated into 50 Ω] or there may be no signal at all.


{{BeginSpecs}}
{{BeginSpecs}}
Line 16: Line 24:
{{Spec | External Reference Input | 1 MHz, 5 MHz or 10 MHz; TTL compatible (internally hard wired so output frequencies counted down to 1 MHz) }}
{{Spec | External Reference Input | 1 MHz, 5 MHz or 10 MHz; TTL compatible (internally hard wired so output frequencies counted down to 1 MHz) }}
{{EndSpecs}}
{{EndSpecs}}
==Rear Interface Signals==
<small>
{| class="wikitable"
|-
! colspan="2" | Connector Pin
! rowspan="2" | Description
|-
! Signal
! Return
|-
| 28A      || 27A || Marker Out (requires front BNC disconnection)
|-
| 27B      || 28B || Trigger Out (requires front BNC disconnection)
|-
| 25A      || 26A || Internal 1 MHz Clock Out (TTL)
|-
| 24B      || 25B || External Clock Input
|-
| 26B      || 22B || Data Good (High when BCD data valid)
|-
| 17A..20A || 22B || bit 4..1 BCD Display data, MSD
|-
| 21A..24A || 22B || bit 4..1 BCD Display data, LSD
|-
| 16A      || 22B || Fast=Low, Slow=High
|}
</small>
==Internals==
The TG501 internally produces a 1 MHz reference clock, either from an internal crystal oscillator, or from an externally supplied frequency.
A 100 MHz VCO is phase-locked to this reference frequency (in fixed-frequency mode) or to the output of a variable 1 MHz astable multivibrator (in variable frequency mode).
When the variable oscillator is in use, its frequency is digitally compared to the fixed 1 MHz reference and displayed as a deviation in percent with a pair of LEDs indicating the sign (fast or slow).
A chain of dividers running off the 100 MHz clock provide the selectable output markers.
The 1 ns output uses a [[step recovery diode]] (HP 5082-8872, part [[152-0503-00]]).


==Links==
==Links==
* See the [[TG501/Repairs]] page for repair information.
* [https://www.youtube.com/watch?v=U5LQpqwqNIU Tek TG501A Time Mark Gen Restoration] by NFM @ YouTube
* [https://www.youtube.com/watch?v=U5LQpqwqNIU Tek TG501A Time Mark Gen Restoration] by NFM @ YouTube
* See the [[TG501/Repairs]] page for repair information.
* [https://www.youtube.com/watch?v=FIe9WzdIZ9g TG501 Repair and Calibration] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=rF5V7D0VZeE TG501 In-Depth Troubleshooting of a Stubborn Unit] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=1t7ndiKzYI8 TG501 In-Depth Troubleshooting of a Stubborn Unit Part 2] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=yl29OOxyNf0 Tektronix TG501A Refresh and Check For a Viewer] by Zenwizard Studios @ YouTube
{{Documents|Link=TG501}}
 
==Prices==
{| class="wikitable sortable"
|-
! Year
! 1975
|-
! Catalog Price
| align="right" | $745
|-
! In 2023 Dollars
| align="right" | $4,300
|}


==Pictures==
==Pictures==
===TG501===
<gallery>
<gallery>
Tek tg501 on.JPG|TG501 early version
Tek tg501 on.JPG         | TG501 early version
Tg 501 late.jpg|TG501 late version
Tg 501 late.jpg           | TG501 late version
Tek tg501a.jpg|TG501A
Tek tg501 internal1.jpg
Tek tg501 waveform.jpg |TG501 output waveform
Tek tg501 internal2.jpg
Tek tg501 internal1.jpg|TG501
Tek tg501 internal3.jpg
Tek tg501 internal2.jpg|TG501
Tek tg501 internal4.jpg
Tek tg501 internal3.jpg|TG501
Tek tg501 internal5.jpg
Tek tg501 internal4.jpg|TG501
Tek tg501 internal6.jpg
Tek tg501 internal5.jpg|TG501
Tek tg501 internal7.jpg
Tek tg501 internal6.jpg|TG501
Tek tg501 early left.jpg | TG501 early version
Tek tg501 internal7.jpg|TG501
Tek tg501 early right.jpg | TG501 early version
Tek tg501 early left.jpg|TG501 early version
Tek tg501 waveform.jpg    | TG501 output waveform
Tek tg501 early right.jpg|TG501 early version
</gallery>
</gallery>
===TG501A===
<gallery>
Tek tg501a.jpg
</gallery>
==Parts==
{{Parts|TG501}}
{{Parts|TG501A}}


[[Category:Time mark generators]]
[[Category:Time mark generators]]
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