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Hello,
I use my USB-TG44A USB-SA44B combo to check a 433 MHz antenna and measured frequency is 423 MHz, not 433 MHz as given in antenna specs. Can it be a kind of Spike display issue or someone have already used it around this frequency and can confirm that is correct ?Thank you.
My guess is that it is telling you the truth. If everything is working correctly this might indicate that your antenna is a tiny bit too long… or it is in an environment that is affecting its resonate characteristics. *Depending on the antenna and where it is mounted*, coax length can sometimes be a factor in resonance while sweeping the characteristics.
The TG can be set to operate on a single frequency and the accuracy could be checked with a frequency counter…
I have found my SA/TG setup to be very accurate and have used the combo to check and tune critical frequency dependent cavities.
Facotl,
I agree with KBONE. The frequency accuracy is 1 ppm. However, the antenna grounding, and any objects near the antenna, interact very strongly with your antenna, and can easily shift the center frequency 10% or more. By moving the antenna and changing the grounding, you can probably achieve your 433 MHz goal.
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