BNC connector
7/6/2010 1:58:45 PMVinny(87135:0)
Greetings,
I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
Thank you,
vinny A.
7/6/2010 9:19:49 PMralph(87138:87135)
:Greetings,
:I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
:Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
:Thank you,
:vinny A.
:
7/6/2010 9:22:57 PMralph(87139:87138)
Hi Vinny,
Why not just get a TNC to BNC adapter? If not, then Digikey, Mouser, Allied, Newark is a good source for connectors.
Ralph
::Greetings,
::I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
::Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
::Thank you,
::vinny A.
::
:
7/6/2010 10:49:26 PMVinny(87141:87139)
Ralp, thank you for responding.
I have to restore this old thing anyway, I am a bit confused because there are so many products out there.
The original tnc (?) connector has a flat surface with threads on the outside and a contact point in the middle of the front flush surface. I also want to match the connector with the appropriate leed connection.
My question is what kind of BNC connector would I use Male/female? to be mounted on the face of the generator? I also want to solder the wire to the rear of it. It's an IG-102.
Thank you,
Vinny A.
:Hi Vinny,
:
:Why not just get a TNC to BNC adapter? If not, then Digikey, Mouser, Allied, Newark is a good source for connectors.
:
:Ralph
:
:
:::Greetings,
:::I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
:::Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
:::Thank you,
:::vinny A.
:::
::
:
7/6/2010 10:50:10 PMVinny(87142:87141)
Sorry, I meant Ralph.
7/6/2010 11:14:48 PMEdd(87143:87139)

Sir Vinny . . . . . .
Au contraire . . . Monsieur . . .What you are having for the original connectors on that unit are the old Amphenol style of connectors.
This being the male connectors, which are used on the unit:

And this . . . . being the female connector that was on the original shielded test cable(s) :

It's definitaley a lot easier and cheaper to find the newer generation BNC connectors . . . but the BNC is a real bear, in its PROPER / PERFECT connecting of a female connector end to its end piece of coaxial cable.
(For your first . . second . . third times !)
73's de Edd

|
:Hi Vinny,
:
:Why not just get a TNC to BNC adapter? If not, then Digikey, Mouser, Allied, Newark is a good source for connectors.
:
:Ralph
:
:
:::Greetings,
:::I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
:::Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
:::Thank you,
:::vinny A.
:::
::
:
7/7/2010 12:02:42 AMralph(87145:87143)
I do not know the proper way to add photos to a posting, but I would just remove the connectors and replace them with BNC female connectors. In this way, you can just purchase pre-made connecting cables with a BNC male on 1 end and your choice of connector or clip or probe on the other. You have not stated how large the hole in the instrument is, but take a look at www.digikey.com and look at their part number A97551-ND. This fits in a 0.375 panel hole. I believe this is a 75 ohm commector, 50 ohm ones are available also depending upon your needs. You would just solder the internal coaxial cable to the new connectors pins. Please let me know if I can help further.
Ralph
:
: : : : : : : : : : : :Sir Vinny . . . . . . : : :Au contraire . . . Monsieur . . .What you are having for the original connectors on that unit are the old Amphenol style of connectors. : : :This being the male connectors, which are used on the unit: : : : : : : : :And this . . . . being the female connector that was on the original shielded test cable(s) : : : : : : : It's definitaley a lot easier and cheaper to find the newer generation BNC connectors . . . but the BNC is a real bear, in its PROPER / PERFECT connecting of a female connector end to its end piece of coaxial cable. : : :(For your first . . second . . third times !) : : : : :73's de Edd : : : : |
:
:
:
:
:
:
:
::Hi Vinny,
::
::Why not just get a TNC to BNC adapter? If not, then Digikey, Mouser, Allied, Newark is a good source for connectors.
::
::Ralph
::
::
::::Greetings,
::::I am trying to rebuild a Heathkit Ig-102 Signal Generator. I want to also replace the connectors to BNC. I believe the old one's are TNC?.
::::Can anyone direct me to a place/link to get the appropriate one's, are they male/Female etc. The appropriate lead connection will follow.
::::Thank you,
::::vinny A.
::::
:::
::
:
7/7/2010 7:46:51 AMVinny(87149:87145)
Ralph, thank you.
That certainly clears up my confusion and where to get them.
I briefly glanced over the manual as I have to leave for work and will not be back until after midnight. The manual did not mention how many ohms the original connectors are (I will check again). It did mention that the cable that came with the unit is A coaxial RG-58A/U. I searched and found that the cable is rated 50 Ohms. I believe the connectors should be the same?
Thank you again,
Vinny A.
7/7/2010 7:34:38 AMVinny(87148:87143)
Dr. Edd,
Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
Vinny A.
7/7/2010 9:29:13 AMLewis L(87151:87148)
:Dr. Edd,
:Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
:Vinny A.
:
7/7/2010 9:38:16 AMLewis L(87152:87151)
::Dr. Edd,
::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
::Vinny A.
Dang. hit the enter again instead of the tab.
Vinny:
What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
Lewis
::
:
7/7/2010 9:38:57 AMLewis L(87153:87152)
:::Dr. Edd,
:::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
:::Vinny A.
:
:
:Dang. hit the enter again instead of the tab.
:Vinny:
:What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
:Lewis
:
:::
::
:
7/7/2010 9:40:27 AMLewis L(87154:87153)
::::Dr. Edd,
::::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
::::Vinny A.
::
::
::Dang. hit the enter again instead of the tab.
::Vinny:
::What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
::Lewis
Correction: change "CN" to "TN"
Can;t type on just one cup of coffee.
Lewis
::
::::
:::
::
:
7/9/2010 9:08:53 PMAlan Douglas(87180:87154)
Switchcraft still makes those mike connectors, I'm pretty sure. They have no impedance rating, and any coax or shielded cable will work with them. But a BNC is a good replacement if you already have other equipment using those connectors. It's a drop-in replacement and you can save the old connector inside the box in case anyone wants to make it original again.
7/10/2010 12:06:10 AMHarvey(87182:87154)
Don't understand why you had a problem with the Amphenol connectors. I've been using them for 50 years and never had the problem described.
:::::Dr. Edd,
:::::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
:::::Vinny A.
:::
:::
:::Dang. hit the enter again instead of the tab.
:::Vinny:
:::What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
:::Lewis
:
:
:Correction: change "CN" to "TN"
:
:Can;t type on just one cup of coffee.
:
:Lewis
:::
:::::
::::
:::
::
:
7/10/2010 10:44:25 AMLewis(87185:87182)
:Don't understand why you had a problem with the Amphenol connectors. I've been using them for 50 years and never had the problem described.
Well, Harvey, chacun à son propre goût (each to his own taste) it would be a dull world if we all liked the same things.
Lewis
:
::::::Dr. Edd,
::::::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
::::::Vinny A.
::::
::::
::::Dang. hit the enter again instead of the tab.
::::Vinny:
::::What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
::::Lewis
::
::
::Correction: change "CN" to "TN"
::
::Can;t type on just one cup of coffee.
::
::Lewis
::::
::::::
:::::
::::
:::
::
:
7/10/2010 12:29:33 PMVinny(87190:87185)
Lewis, Alan, and Harvey, et al.
Thank you for responding and your advice. I am still a newbie and have not tried alignments as of yet. I want to restore the unit that I have and learn to align with no variations that original parts may give. I am reading lots of theory and trying to learn; it’s tough to do with two jobs but that is no excuse.
I am still trying to figure out how many ohms the new BNC’s should be and also buy new leads for the unit to match. Some BNC’s have which looks like plastic as a bushing which would then give no common connection (at least in the photos) to the generator; the choices are 50 ohm and 75 ohm. I am waiting for the caps and 1 resistor which is out of tolerance to come so I could install them. Any advice would be appreciated.
Vinny A.
7/10/2010 3:37:19 PMAlan Douglas(87193:87190)
50 ohms is more common.
7/10/2010 7:03:25 PMVinny(87200:87193)
Alan,
Thank you for responding.
I am a bit confused as to which one's to purchase. Are the leads also sold in ohmage and do they have to match in ohms? When you say 50 ohms is more common, what do you mean? common to buy? Use? etc.?
Sorry for my ignorance in this matter.
Thank you,
Vinny A.
7/10/2010 10:06:22 PMAlan Douglas(87207:87200)
BNCs are used for general RF (50 ohms) or video (75 ohms). For short cables, at the frequencies you're using, it doesn't matter.
I'm given to understand that the 75 ohm BNCs have slightly different pin diameters, and don't always mate properly with 50 ohm connectors, but I have never observed that myself.
7/10/2010 1:45:55 PMHarvey(87192:87185)
Didn't mean to hurt your feelings, just relating my experience.
::Don't understand why you had a problem with the Amphenol connectors. I've been using them for 50 years and never had the problem described.
:
:Well, Harvey, chacun à son propre goût (each to his own taste) it would be a dull world if we all liked the same things.
:Lewis
:
:
::
:::::::Dr. Edd,
:::::::Thank you, that is exactly what they are. I would love to see your med. library and you O.R.
:::::::Vinny A.
:::::
:::::
:::::Dang. hit the enter again instead of the tab.
:::::Vinny:
:::::What you have there is a microphone connector that isn't worth a Hoot, as the center connector will break off inside the female part, after just a few hours of service. They used those things in the microphones in my high school, and I repaired them oon a real regular basis. The BNC/TNC is a true RF connector, the difference being is that the "B" stands for bayonet, and the "T" stands for "Threaded" the "C" stands for "Compact" as there is also a "BN" and "CN", which are, of course, larger. By all means, change to BNC. You, I am sure, will be glad you did.
:::::Lewis
:::
:::
:::Correction: change "CN" to "TN"
:::
:::Can;t type on just one cup of coffee.
:::
:::Lewis
:::::
:::::::
::::::
:::::
::::
:::
::
:
7/10/2010 6:58:28 PMvinny(87199:87192)
Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
Thank you again,
Vinny A.
7/10/2010 8:27:26 PMMarv Nuce(87204:87199)
Vinny,
Must admit the quick snap latch of a BNC is preferrable to the fine threaded collar of an Amphenol you described or type "F" (cable TV/VCRs etc. Think the original Amphenol was designed primarily for Audio use, and as such would probably be approx 600 ohms impedance. The BNC, whether 50/75 ohms should work well, and as such with clip leads on the user end, the impedance is unimportant, but shielding is a must
marv
:Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
:Thank you again,
:Vinny A.
:
7/10/2010 8:39:39 PMMarv Nuce(87205:87199)
Vinny,
One additional item. Those chassis mount female BNC's can be found in 2 different flavors. Isolated from the chassis mount nut hardware (not as sturdy) or not isolated, and this is important for some radios (AC/DC) with one side of the line tied to chassis. If you always use a line isolation transformer for the test equip or the unit under test, you're probably OK, otherwise the isolated BNC may be preferred. Others may expand on this subject as well.
marv
:Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
:Thank you again,
:Vinny A.
:
7/11/2010 4:46:59 PMHarvey(87224:87199)
Not you. Lewis seemed upset that someone disagreed with him.
:Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
:Thank you again,
:Vinny A.
:
7/11/2010 9:31:42 PMRalph(87225:87224)
The BNC's with the plastic bushing have a connection for the center terminal AND a connection for the shell. You will be connecting the wire from the center pin of the original Amphenol connector to the center pin of the new BNC and the BNC shell either to chassis common or to the shield of the coax, if that was used. Whether you choose a BNC with a plastic bushing or not, I expect the hole in the front panel will be too large to mount the new BNC without making some kind of bushing or spacer.
:Not you. Lewis seemed upset that someone disagreed with him.
:
::Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
::Thank you again,
::Vinny A.
::
:
7/11/2010 11:07:19 PMLewis L(87227:87225)
:The BNC's with the plastic bushing have a connection for the center terminal AND a connection for the shell. You will be connecting the wire from the center pin of the original Amphenol connector to the center pin of the new BNC and the BNC shell either to chassis common or to the shield of the coax, if that was used. Whether you choose a BNC with a plastic bushing or not, I expect the hole in the front panel will be too large to mount the new BNC without making some kind of bushing or spacer.
:
:
:
:
:
::Not you. Lewis seemed upset that someone disagreed with him.
::
:::Harvey, you did not hurt my feelings. In fact, I thank you for responding. Any help from anybody (including opinions) is always welcome and appreciated. I like to see all sides of any equation before I act upon it (at least sometimes).
:::Thank you again,
:::Vinny A.
:::
::
:
7/11/2010 11:14:00 PMLewis L(87228:87225)
:The BNC's with the plastic bushing have a connection for the center terminal AND a connection for the shell. You will be connecting the wire from the center pin of the original Amphenol connector to the center pin of the new BNC and the BNC shell either to chassis common or to the shield of the coax, if that was used. Whether you choose a BNC with a plastic bushing or not, I expect the hole in the front panel will be too large to mount the new BNC without making some kind of bushing or spacer.
:
:
:
:
:
::Not you. Lewis seemed upset that someone disagreed with him.
I seemed upset? If I were upset everytime sometime disageed with me, I would probably be insane. I said each to his own taste. I happen to like the snap-click-pluggged or unplugged of the BNC.
Lewis