Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Diagnostic & Test Equipment

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 05-30-2018, 05:46 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,758
Can I make my own probes for a B&K 415?

I bought a B&K 415 (together with a 1077) a few years ago and did not get any probes with them. A while back I recapped the 415 and I'd like to try my hand at learning TV alignment. Can these probes be made? If so what all is supposed to be in them?

I have at least two spare mike connectors that mate with the front panel connectors*...I also have the probe end of a B&K demodulator probe (I bought it years before the 415 to rob the rest of the cable for an old AM radio alignment gen that uses the same front panel mike connectors as the 415).

*I also have two cables that fit the front panel connectors one ends in clip leads the other in an RCA jack (I don't want to modify these since I use them with another alignment gen and an audio amp).
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
  #2  
Old 05-30-2018, 07:06 PM
andy andy is offline
VideoKarma Member
 
Join Date: Jul 2002
Posts: 4,004
...

Last edited by andy; 01-17-2019 at 09:29 AM.
Reply With Quote
  #3  
Old 05-31-2018, 07:37 AM
kvflyer kvflyer is offline
VideoKarma Member
 
Join Date: Nov 2006
Location: Fernandina Beach, FL
Posts: 1,057
Quote:
Originally Posted by andy View Post
I replaced the mic jacks on my 415 with BNCs. It makes it much easier to work with since I can use off the shelf cables and probes.
That is a very practical way to handle this. Unless one is hard set on "originality", BNC connectors do make it a lot easier.
Reply With Quote
  #4  
Old 05-31-2018, 07:55 AM
N2IXK's Avatar
N2IXK N2IXK is offline
Technohippie
 
Join Date: Apr 2011
Location: Sittin' on the "Group W" bench...
Posts: 799
Another vote for installing BNCs and going with standard probes.

BNC connectors fit the standard .375 holes for the mic connectors, so no drilling needed.

Last edited by N2IXK; 05-31-2018 at 11:30 AM.
Reply With Quote
  #5  
Old 05-31-2018, 10:11 AM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,758
This B&K 415 is a TV alignment sweep/marker generator...Are oscilloscope probes even valid to use with it for any purpose?

The BNC switch would be relatively easy as I have several loose female BNC jacks in my parts bin...
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
Audiokarma
  #6  
Old 05-31-2018, 02:30 PM
Kevin Kuehn's Avatar
Kevin Kuehn Kevin Kuehn is offline
Workin' Late Again
 
Join Date: Jan 2011
Location: WI
Posts: 3,824
If you don't already have them you can download the schematic and operators manual here.

https://elektrotanya.com/bk-precisio.../download.html

The manual shows all the cables the unit came with. No reason you can't make your own using some RG58 coax. Agree with changing mic connectors to BNC, and I believe the hole size is the same 3/8"? You don't even need a demodulator probe if you pick off the signal after the TV's detector diode. Can't think of any reason you'd use a scope probe unless you want the attenuation. I like using a BNC to mini grabbers cable to connect in circuit. BNC to BNC for hooking to scope.

Last edited by Kevin Kuehn; 05-31-2018 at 02:36 PM.
Reply With Quote
  #7  
Old 02-04-2020, 11:13 AM
koviatt koviatt is offline
VideoKarma Member
 
Join Date: Nov 2018
Posts: 13
Did you get anywhere with this? I need the 300/75 Ohm cable (or a readable schematic of the probe).
Reply With Quote
  #8  
Old 02-04-2020, 11:42 AM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,758
I converted it to BNC and all cables except the demod cable (which I found in my junk box) and the injection cable became straight BNC to BNC. IIRC one of the manuals on the unit showed the injection cable Balun as a simple resistor network, and I didn't have the right parts on hand so I never built it.

I'm not where it's at presently so this is all memory...
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
  #9  
Old 10-30-2020, 08:57 PM
TonyP TonyP is offline
VideoKarma Member
 
Join Date: Jul 2012
Posts: 75
The demodulator probe is about the only probe that is better bought factory if you can find it. The manual gives you an idea of how the other cables are made up. And this YT video taks about the RF out cable. https://m.youtube.com/watch?v=kRaYG-dmCPw
Reply With Quote
  #10  
Old 10-31-2020, 09:38 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,758
Quote:
Originally Posted by TonyP View Post
The demodulator probe is about the only probe that is better bought factory if you can find it. The manual gives you an idea of how the other cables are made up. And this YT video taks about the RF out cable. https://m.youtube.com/watch?v=kRaYG-dmCPw
That video on the RF output cable is good I can probably whip that up in 15min once I dig up the parts from my junk bins.

I actually had the probe end of a B&K demodulator probe (don't know if it was for the 415) that I had chopped the coax and mic connector off of over a decade ago to use for a Heathkit color bar/test pattern generator....I had kept the demodulator end that had all the special sauce (it actually didn't look hard to copy) and just replaced the coax stub with proper new coax to make it usable again...I haven't needed it yet, but I've only tried to align one TV so far.
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
Audiokarma
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:19 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.