nanovna Battery Specifications
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BTW..... this version is the so-called "better" one with shielding. It is better construction than my "white salamander worst" unit or my black "worse" one. The noise floor might be slightly lower on this one but I find no practical measurement differences among the three. Given a choice I would probably choose this one but I would also be perfectly happy with either of the other two.
WA8TOD |
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How can you tell if it is shielded?? I see several small shielding "cans" on the PCB.? Is that the only shielding that the "shielded" ones have???
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Mike WY6K "... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..." On Friday, September 27, 2019, 9:19:15 AM CDT, Warren Allgyer <allgyer@...> wrote:
BTW..... this version is the so-called "better" one with shielding. It is better construction than my "white salamander worst" unit or my black "worse" one. The noise floor might be slightly lower on this one but I find no practical measurement differences among the three. Given a choice I would probably choose this one but I would also be perfectly happy with either of the other two. WA8TOD |
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This is the bottom side of the shielded version. The shields are on the right and cover the RF portions. Many..... most maybe.... do not have these shields. If yours does not, do not fret. They make no significant difference in practical use.
The space on the lower left is where the battery goes, secured by a piece of double sided tape or a dab of contact cement. Battery solder tabs are in the upper left corner. WA8TOD |
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Thanks Warren.? Mine has those shields.? I have heard that the shields increase the dynamic range above 300 MHz and especially above 600 MHz.? Is that not true?
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Mike WY6K On Friday, September 27, 2019, 01:29:24 PM CDT, Warren Allgyer <allgyer@...> wrote:
This is the bottom side of the shielded version.? The shields are on the right and cover the RF portions. Many..... most maybe.... do not have these shields. If yours does not, do not fret. They make no significant difference in practical use. The space on the lower left is where the battery goes, secured by a piece of double sided tape or a dab of contact cement. Battery solder tabs are in the upper left corner. WA8TOD |
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Mike,
The do indeed increase the dynamic range somewhat. The dynamic range at 600 MHz and above is rated at 40 dB and all of the units I tested , even the worst ones, met this spec. I have no uses for which I need dynamic range greater than 30 dB. For example, a return loss of 30 dB equates to a VSWR of 1.07 to 1. Trust me..... if I can achieve 1.07 to 1, even for my broadcast clients, I have no need to go further. And 30 dB return loss is easily seen with a dynamic range of 40 dB. I have never, in my broadcast or in my hobby career spanning 50 years, had the need to measure return loss greater than that number. Some may say they want to see filter skirts down to 60 dB or below. There are such needs but I don't have them. If I can see the -3 dB point and the -40 dB point..... I have no need to know the exact frequency where the attenuation is more. And, if I did, I would use and amplifier on Port0 to expand the dynamic range as was illustrated here in an earlier post. You have a better unit. But I would be stunned if you do anything with it that could not be done with the least of the Nanovna versions. WA8TOD |
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Thanks!??
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Mike WY6K "... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..." On Friday, September 27, 2019, 03:42:37 PM CDT, Warren Allgyer <allgyer@...> wrote:
Mike, The do indeed increase the dynamic range somewhat. The dynamic range at 600 MHz and above is rated at 40 dB and all of the units I tested , even the worst ones, met this spec. I have no uses for which I need dynamic range greater than 30 dB. For example, a return loss of 30 dB equates to a VSWR of 1.07 to 1. Trust me..... if I can achieve 1.07 to 1, even for my broadcast clients, I have no need to go further. And 30 dB return loss is easily seen with a dynamic range of 40 dB. I have never, in my broadcast or in my hobby career spanning 50 years, had the need to measure return loss greater than that number. Some may say they want to see filter skirts down to 60 dB or below. There are such needs but I don't have them. If I can see the -3 dB point and the -40 dB point..... I have no need to know the exact frequency where the attenuation is more. And, if I did, I would use and amplifier on Port0 to expand the dynamic range as was illustrated here in an earlier post. You have a better unit. But I would be stunned if you do anything with it that could not be done with the least of the Nanovna versions. WA8TOD |
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An update on dynamic range. In the photo the upper unit is the unshielded "worse" version and the bottom is the latest, best, shielded version. Both are calibrated for the 600 - 900 MHz range, Logmag, Ch1 with Through calibration. The reference level is the seventh level on both.
The diffenence in noise floor ranges from 3 - 10 dB across the range. Both units meet the dynamic range spec of 40 dB with the shielded unit showing better than 50 dB at the low end. For my purposes the two units are substantially identical. WA8TOD |
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for once and all: SPECIAL HANDLING and SPECIAL MARKING of packages sent by Air Transport is ONLY REQUIRED (by International Agreement) WHEN THE TOTAL AMOUNT OF STORED ENERGY EXCEEDS 100 WH.
"WH" means Watt-Hour. the shippers form specifies this value is computed using the total Ampere-hours times Battery Voltage contained within a package. if the total is 100WH or more, then a specific sticker is to be placed on the outside of the package and certain carrier procedures are to be followed. 100 WH = 0.45 Ah * 3.7V * 60 .. it would take 61 individual 450mAh 3.7V batteries IN ONE PACKAGE to exceed 100 WH. yes, i am a bit irritated by an electronics vendor who would not include one lithium "coin battery" in the package for their product because of "international air transport restrictions"! - 0x49 - |
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Dr. Dave
I already noted that you cannot see the -60 dB point on a filter in through mode with a dynamic range of 40 dB. And I already noted that 99% of the time I personally do not need to see the 60 dB point and that for the 1% I can add an amp to the source. You may well need to see that at Kirkby Microwave Ltd,/drkirkby@.../ 01621-680100./ +44 1621 680100/Registered in England & Wales, company number 08914892./Registered office:/Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United/Kingdom. And that is likely why you have equipment available to do so. And I am glad you have such equipment because between talking about that and your self promotion there is very little meat left in your posts. The vast, vast majority of the people on this board have no need for that level of detail. Sheesh! Give it a rest will you? WA8TOD |
Warren Allgyer
WY6K Mike Watts
kb3cs
Bear Albrecht