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Author Topic: "qof" connector. Anyone know what that is?  (Read 156 times)

KK4GMU

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"qof" connector. Anyone know what that is?
« on: June 18, 2022, 07:30:10 AM »

I got this mostly helpful paragraph on how to diagnose noise.  But there is one sentence and word I do not understand, below, in italics and bold:  Qof.  It is either a misprint or something I have not heard of.  Any takers?

Quote
"Still get noise when antenna disconnected?  If yes, check power supply.  If no then it is coming on on coax center conductor or outer shield which also acts as a 1nd receiving antenna.  Unscrew antenna connector and only put in center conductor. Measure noise.  Then screw in outside qof connector. If noise goes up. Then you have common mode noise and our coax noise filter will suppress the outer braid noise while leaving the signal on the center untouched.  Part# cmnf-500-50vhf"
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WA3SKN

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Re: "qof" connector. Anyone know what that is?
« Reply #1 on: June 18, 2022, 07:41:55 AM »

I don't know what "qof" means.
I do know that when working with FM this test is not valid.

-Mike.
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KK4GMU

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Re: "qof" connector. Anyone know what that is?
« Reply #2 on: June 18, 2022, 07:58:12 AM »

Speaking of "test not valid on FM", here are the S meter readings I get on each mode on the same 2 meter frequency - actually all acress that band:

FM:  S9
AM:  S5 to 6
RTTY:  S2
CW:  S1 to 2
SSB:  S4
DV:  S6 to 7

I never checked for those variances before and I don't know their significance, if any.
« Last Edit: June 18, 2022, 08:13:22 AM by KK4GMU »
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K7AAT

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Re: "qof" connector. Anyone know what that is?
« Reply #3 on: June 18, 2022, 08:17:23 AM »

I would assume the qof was a typo ... meant to be 'of'.
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KK4GMU

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  • Posts: 366
Re: "qof" connector. Anyone know what that is?
« Reply #4 on: June 18, 2022, 08:17:34 AM »

I got this mostly helpful paragraph on how to diagnose noise.  But there is one sentence and word I do not understand, below, in italics and bold:  Qof.  It is either a misprint or something I have not heard of.  Any takers?

Quote
"Still get noise when antenna disconnected?  If yes, check power supply.  If no then it is coming on on coax center conductor or outer shield which also acts as a 1nd receiving antenna.  Unscrew antenna connector and only put in center conductor. Measure noise.  Then screw in outside qof connector. If noise goes up. Then you have common mode noise and our coax noise filter will suppress the outer braid noise while leaving the signal on the center untouched.  Part# cmnf-500-50vhf"

OK, I got it.  The "q" in front of "of" is a mistype.  He just meant "...then screw in outside of connector."  Sheesh that took me a long time to figure out.


Thanks, K7AAT.  You posted the answer to my puzzle at the same time.
« Last Edit: June 18, 2022, 08:20:34 AM by KK4GMU »
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