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Author Topic: VFO Resistor help please for ID  (Read 2759 times)
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N2LK
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« on: February 23, 2017, 08:35:42 AM »

Me again...in an effort to eliminate chirp on 40M and higher for my Valiant I am checking components in
the VFO and I am having a hard time identifying this bad boy in photo...its connected between tab 2 on the terminal strip
and pin 10 of SW1 bandswitch.

I measure it across the resistor leads at 1.662K ohms...its colored BRN/GRN/RED/SIL...

Any ID help is appreciated...
FYI I have replaced insulators on the PA cap for improved grounding which did help the chirp on 40 M but higher bands are still
chirping away...this did help stabilize a bit but not enough..

thanks for any suggestions..
73
John-N2LK


* vfo resistor.jpg (283.23 KB, 1328x747 - viewed 331 times.)
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WD5JKO
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WD5JKO


« Reply #1 on: February 23, 2017, 09:11:36 AM »



1.5K carbon composition, 10% tolerance, 2 watts

http://www.answers.com/Q/Is_there_a_rhyme_for_remembering_colour_bands_on_a_resistor

Jim
Wd5JKO
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N2LK
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« Reply #2 on: February 23, 2017, 09:18:40 AM »

OK, that makes it R4 in the schematic....matches up...

Well that question is answered...thanks
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n4joy
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« Reply #3 on: February 23, 2017, 09:29:34 AM »

I have a cardboard resistor/inductor color identification "wheel" on my bench--nice to have handy.  On a side note, two watts carbon comps seem to be getting expensive and are not readily available like the 1/2 watt or 1 watt carbons. 
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N1BCG
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« Reply #4 on: February 23, 2017, 12:59:10 PM »

VFO chirp can also be caused by improper setting of L17 located under the VFO. Page 10 of your manual might specify how it should be set. Depending on which manual revision you have, it will say to either:

a) Adjust L17 all the way out
b) Adjust L17 for maximum grid current
c) No mention of L17 (12/57 revision)

I adjusted my L17 so that it's all the way out. This reduced chirp (CW) and some FM artifacts (AM), part

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N2LK
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« Reply #5 on: February 23, 2017, 01:22:14 PM »

That is a great idea, will do.
Thanks

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