Re: NanoVNA Under The Covers
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Here is the RLB that I have got. I have checked with manual measurements that at the HF end I can get 60dB return loss. I do not expect the nano vna can out perform this unit, but I want to make sense of its 70dB return loss. Is that so difficult for people to understand?Sent from my Samsung Galaxy smartphone.
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-------- Original message --------From: Peter Gottlieb <hpnpilot@...> Date: 05/08/2019 03:52 (GMT+01:00) To: [email protected] Subject: Re: [nanovna-users] NanoVNA Under The Covers How would you measure that kind of return loss accurately?PeterOn 8/4/2019 9:50 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:> On Mon, 5 Aug 2019 at 00:32, tuckvk3cca <tuckvk3cca@...> wrote:>>> That 1.005 swr is up at the 5GHz end I presume. At 500MHz you can get>> 70dB.?? I have seen some people complain that some such loads have a bump>> at 1GHz, origin unknown.Sent from my Samsung Galaxy smartphone.>> Why do you assume that you can get 70 dB at 500 MHz? I think you can be> pretty sure if Keysight believed they could get a 70 dB return loss up to> 500 MHz, it would be in the data sheet.>> I very much doubt NPL, NIST, METAS or any other national standards> laboratory could measure 70 dB return loss.>> Dave.>>
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