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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
Hi Dave,
I saw your N Plug male pin gap measuring gauge pic. Thanks for it, I never saw such device before. Good point. I have both, the AA-600 and the NanoVNA, so a comparison is of interest. Question: Does that gap matter significantly below the AA-600 range of max. 600 MHz? I gueth, that AA-600 users, mostly working below 440 MHz, will not find significant differences because of this tiny little gap. I love my AA-600 and would buy it again. It is my most used tool. But I work mainly below 30 MHz anyway. I think, however, your subject is good to know for anyone using SMA to N Adapters with the the NanoVNA, too, especially if used with 1.5 GHz. Similar reasons apply. But it probably is much harder to find N adapters with warranted gap, not to talk about the extra SMA gap that the AA-600 does not have. I used what I could get, see pic: Chinese N to SMA adapters - no gap specified. 73, Hans DJ7BA -----Urspr¨¹ngliche Nachricht----- Von: [email protected] <[email protected]> Im Auftrag von Dr. David Kirkby, Kirkby Microwave Ltd Gesendet: Freitag, 12. Juni 2020 03:29 Cc: [email protected] Betreff: Re: [nanovna-users] RigExpert's PC software now Supports NanoVNA and is Open Source #applications #consolecommands #measurement On Fri, 12 Jun 2020 at 00:53, MICHAEL ST ANGELO <mstangelo@...> wrote: I would have followed up by contacting Rig Expert directly or via theThe item was purchased by a club. A decision was made by the members to ignore the problem. We were not willing to risk buying from the Ukraine, so would not have risked sending it to the Ukraine. If you read eham reviews on RigExpert products, you will see at least one comment that negative comments about their products get removed from the forum. For example G3GXG writes about some firmware suggestions. ¡° I tried sharing my concerns on the RigExpert site but every time I did, my comments were removed. This is clearly a raw subject for them.¡± Many of the issues raised here (connector specification, inability to input coefficients of calibration standards, risk of damage to precision connectors if mated with poor quality parts), are applicable to any VNA. Dave. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 -- Diese E-Mail wurde von Avast Antivirus-Software auf Viren gepr¨¹ft. |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
Dave,
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You said yourself you (and the club) had the option to return it for a refund, but ***YOU CHOOSE NOT TO ***. Let's leave it at that and stop bashing them on this forum -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dr. David Kirkby, Kirkby Microwave Ltd Sent: 12 June 2020 01h04 To: [email protected] Subject: Re: [nanovna-users] RigExpert's PC software now Supports NanoVNA and is Open Source #applications #consolecommands #measurement On Thu, 11 Jun 2020 at 22:59, n2msqrp <mstangelo@...> wrote: Dave, Mike, As stated on the website, I contacted the supplier (RadioWorld) who were most unhelpful. I didn¡¯t list their comments on the website, but they were unhelpful. A guy from RadioWorld telephoned me and said that they were never aware of anyone else ever measuring an N connector. He said it was only a little out of specification. Despite not knowing me, he said that if I sold something and it was only a little out of specification I would think okay. RadioWorld would take it back and give a refund, but didn¡¯t want to supply another. So it was a case of accepting that one or getting a refund, The guys at the radio club decided that we wanted the unit, and since at the time they were the only UK supplier, we did not have a lot of choice. We were not willing to order from the Ukraine. It was actually a very close vote in the club, with nearly 50% saying return it, get a refund and just over 50% saying we should keep it. There was a single vote in it. Under UK law our contract is with the supplier, not the manufacturer. The supplier was most unhelpful, so I personally would not but from RadioWorld (no doubt lots of people have bought from them and been happy, but I found their response most unprofessional). At a practical level, it is not going to make much difference to us. Although the manual says good quality calibration standards should be used, at least in the firmware we have, there¡¯s no way to enter the coefficients of any calibration standards. In my opinion the manual is poor, as it implies it is an accurate unit that¡¯s precalibrated, so if you perform an OSL calibration, then you must use good quality calibration standards. But that is flawed on two counts 1) You can not enter coefficients for calibration standards, so the whole idea of using good ones is totally wrong. 2) Good quality calibration standards would actually be damaged by the RigExpert we have. I have never sought to return the item to anyone other then the UK supplier, and as I say they were unhelpful. Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
On Fri, 12 Jun 2020 at 00:53, MICHAEL ST ANGELO <mstangelo@...>
wrote: I would have followed up by contacting Rig Expert directly or via theThe item was purchased by a club. A decision was made by the members to ignore the problem. We were not willing to risk buying from the Ukraine, so would not have risked sending it to the Ukraine. If you read eham reviews on RigExpert products, you will see at least one comment that negative comments about their products get removed from the forum. For example G3GXG writes about some firmware suggestions. ¡° I tried sharing my concerns on the RigExpert site but every time I did, my comments were removed. This is clearly a raw subject for them.¡± Many of the issues raised here (connector specification, inability to input coefficients of calibration standards, risk of damage to precision connectors if mated with poor quality parts), are applicable to any VNA. Dave. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
On Thu, 11 Jun 2020 at 22:59, n2msqrp <mstangelo@...> wrote:
Dave, Mike, As stated on the website, I contacted the supplier (RadioWorld) who were most unhelpful. I didn¡¯t list their comments on the website, but they were unhelpful. A guy from RadioWorld telephoned me and said that they were never aware of anyone else ever measuring an N connector. He said it was only a little out of specification. Despite not knowing me, he said that if I sold something and it was only a little out of specification I would think okay. RadioWorld would take it back and give a refund, but didn¡¯t want to supply another. So it was a case of accepting that one or getting a refund, The guys at the radio club decided that we wanted the unit, and since at the time they were the only UK supplier, we did not have a lot of choice. We were not willing to order from the Ukraine. It was actually a very close vote in the club, with nearly 50% saying return it, get a refund and just over 50% saying we should keep it. There was a single vote in it. Under UK law our contract is with the supplier, not the manufacturer. The supplier was most unhelpful, so I personally would not but from RadioWorld (no doubt lots of people have bought from them and been happy, but I found their response most unprofessional). At a practical level, it is not going to make much difference to us. Although the manual says good quality calibration standards should be used, at least in the firmware we have, there¡¯s no way to enter the coefficients of any calibration standards. In my opinion the manual is poor, as it implies it is an accurate unit that¡¯s precalibrated, so if you perform an OSL calibration, then you must use good quality calibration standards. But that is flawed on two counts 1) You can not enter coefficients for calibration standards, so the whole idea of using good ones is totally wrong. 2) Good quality calibration standards would actually be damaged by the RigExpert we have. I have never sought to return the item to anyone other then the UK supplier, and as I say they were unhelpful. Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
On Thu, 11 Jun 2020 at 21:51, Zack Widup <w9sz.zack@...> wrote:
I have used at least 10 different N connectors, including commercially-made I am not surprised at all Zack. However, in the case of * This particular RigExpert AA-600 * A good quality calibration standard damage would result because the N connector on the particular sample I checked was out of specification. Most inner conductors are recessed by at least 0.010¡± on typical cheap N plugs, so in most cases it is not an issue. I believe that the most lax specification allows for recession of up to 0.040¡±, so in a worst case scenario, two connectors each meeting the specification could have a gap of 0.080¡±, although 0.015¡± is more typical. However, I personally expect to have an N connector fitted to a ?600 item to actually meet the specification for an N connector, but that one did not. On an amateur grade product I don¡¯t expect the best quality connectors, but I would expect them to meet the specification, which means that there should be no protrusion whatsoever. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
On Thu, 11 Jun 2020 at 18:52, randmental <Randmental@...> wrote:
And why would you push your Connector analysis, showing massive 0.003" The RigExpert manual describes how to perform an open/short/load calibration standards, but *states that good quality standards must be used. * However, if the particular unit we have was mated with a good quality N calibration standard, it would damage the standard. For typical cheap connectors one would not be overly concerned, but the manual says good quality calibration should be used, but in that case it would damage a good quality standard. I am sure that there will be variation between units, but on the sample of one RigExpert AA-600 I tested, the N connector was out of specification. Dave G8WRB. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: RigExpert's PC software now Supports NanoVNA and is Open Source
#consolecommands
#measurement
#applications
On Thu, 11 Jun 2020 at 16:20, N8AUM via groups.io <n8aum@...>
wrote: Great explanation about the tight tolerance with N type connectors but No, the lack of a gasket is not a problem - you will never find one on any calibration standard. They are generally more of a nuisance than useful in a lab - I remove them. They just trap the small metal particles that always wear away on connectors as they are used. The *metal* on the outer conductor of the male will touch the *metal* on the outer conductor of the female. It is those two metal surfaces that touch and prevent the much more delicate gold plated inner conductors from ramming into each other. On the very best quality connectors, which are very expensive, the two relevant parts of the inner conductors will be separated by 0.0005¡± or less. You could never achieve that sort of accuracy by replying on a compressible gasket. You need a metal to metal contact. You raise an interesting point though - I might add that to the website at some point. G8WRB. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 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 |
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Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support
#firmware
I see you didn't expect an answer from me.
Successful source search. We will be happy to use the product without knowing how it is made. |
RandMental
Dr. David Kirkby, Kirkby Microwave Ltd
Gyula Molnar