You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Usually when odd capacitor values are needed, two smaller-valued capacitors are put in parallel. Typically the value needed can be within +/-10%, because it varies anyways due to inductor tolerance and cavity effects of the enclosure.

If you're really into such things like filters, or anything RF really, you need to look into getting a vector network analyzer. A VNA allows you to measure the loss of the filter, the SWR of the filter, etc. It sweeps frequency and gives you a plot.
One popular VNA is the N2PK VNA. Unfortunately, its not sold as a completed unit as far as i know. Only the PCB is available, and it has to be built like a kit.

Cool thing about the VNA is that its a do-everything RF test instrument.

[QUOTE="dudmuck, post: 131964, member: 3904"] Usually when odd capacitor values are needed, two smaller-valued capacitors are put in parallel. Typically the value needed can be within +/-10%, because it varies anyways due to inductor tolerance and cavity effects of the enclosure. If you're really into such things like filters, or anything RF really, you need to look into getting a [b]vector network analyzer[/b]. A VNA allows you to measure the loss of the filter, the SWR of the filter, etc. It sweeps frequency and gives you a plot. One popular VNA is the [b]N2PK VNA[/b]. Unfortunately, its not sold as a completed unit as far as i know. Only the PCB is available, and it has to be built like a kit. Cool thing about the VNA is that its a do-everything RF test instrument. [/QUOTE]

Top Bottom