Re: HP Agilent 8753ES VNA repair [Help]
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Hello Yves,
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Thank you for your last post.?
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My VCO frequencies in TP20 are not correct. I have :
- a RF signal is at 39.100 MHz, -1.3 dBm instead of 39.840 on your board for frequency >16 MHz?
- a RF signal is at 39.280 MHz, -1.3 dBm ?for frequency <16 MHz?
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On PIN 2 on the divider output : 39.100 MHz divide by 40 : 977 KHz. -> The 2sd LO frequency I measure. ?
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The 2sd LO is at 977 KHz instead of 996 KHz this is why my sampler FI output is at 23 KHz instead of 4 KHz.
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My VCXO is at 40.000 precisely. The VCO output to the mixer do not correctly converts the signal to L=4kHz and H=160kHz from what I measure. I have a signal at 909 KHz here.
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MattSNE