Topics

WTB 680nF Inductors #parts

Dale Hardin
 

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL

Ted
 

Jonas Sanamon
 

Hi Dale,

Not to discourage You from doing this,  but my experience with replacing the toroids with the 680nF SMDs showed no change whatsoever. I have photos of the spectrum analyser screens before and after and they are pretty much identical.  But maybe this is because i haven't done the relay replacement modification yet...?

Best Regards,
Jonas - SM4VEY

Den lör 21 sep. 2019 kl 13:22 skrev Dale Hardin <joe.dale.hardin@...>:

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL

Dale Hardin
 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:
Hi Dale,

Not to discourage You from doing this,  but my experience with replacing the toroids with the 680nF SMDs showed no change whatsoever. I have photos of the spectrum analyser screens before and after and they are pretty much identical.  But maybe this is because i haven't done the relay replacement modification yet...?

Best Regards,
Jonas - SM4VEY

Den lör 21 sep. 2019 kl 13:22 skrev Dale Hardin <joe.dale.hardin@...>:
Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL

Dale Hardin
 

Were you able to test to see if they worked?  Dale

On Sat, Sep 21, 2019 at 1:14 PM Ted via Groups.Io <k3rta=yahoo.com@groups.io> wrote:
I bought these, and reasonably-shipped:



Ted
k3rta





--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL

Evan Hand
 

Sorry to nit pick, however I do not know where to get 680nF inductors, only 680nH inductors.  I assuming that you do mean the 680 nanoHenry inductors that were suggested by Raj, vu2zap in this thread:
https://groups.io/g/BITX20/topic/27154925#60568

That is unless I missed something about a part number.

Also, the relay and or off board filters do not address the spurs issues, only the harmonics issues.  The 2 spur fixes are either the shielded SMD inductors per Raj, or the Ashhar v5 fix with an LCL low pass filter before the last mixer in the transmitter chain.

It should be noted that there seems to be less harmonics when using SSB, but higher spurs on the upper bands.  For CW, Harmonics on the lower bands, and less on upper bands with little reported spurs on any band. 

This goes along with what I have been able to measure, though I do not trust the spurs testing that I did due to a poor RBW on the spectrum analyzers that I had at my disposal at the time.

73
Evan
AC9TU

MadRadioModder
 

An easier fix is to sell the V3 and buy a V5.  Boom.  Done.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dale Hardin
Sent: Saturday, September 21, 2019 5:10 PM
To: BITX20@groups.io
Subject: Re: [BITX20] WTB 680nF Inductors #parts

 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

 

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:

Hi Dale,

 

Not to discourage You from doing this,  but my experience with replacing the toroids with the 680nF SMDs showed no change whatsoever. I have photos of the spectrum analyser screens before and after and they are pretty much identical.  But maybe this is because i haven't done the relay replacement modification yet...?

 

Best Regards,

Jonas - SM4VEY

 

Den lör 21 sep. 2019 kl 13:22 skrev Dale Hardin <joe.dale.hardin@...>:

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL


 

--

Dale Hardin

24750 State St. Unit 487

Elberta, AL 36530
251-597-9256


--
Dale Hardin, KS4NS
Elberta, AL


Virus-free. www.avg.com

--

…_. _._

Dale Hardin
 

Yeah, whats a few farads or henrys between friends.  We all know what I am looking for nomatter how I say it.  You're also right that this fix only address harmonics, not spurs. I knew that. That's what I get from using the laptop at home rather than the desktop in the office where my info is.  My memory isn't what it used to be and I'll be the first to admit it.  Beats the alternative though.  I've got to do the V5 filter fix also.  I think I have all the parts for that.  Regards, Dale

On Sat, Sep 21, 2019 at 5:39 PM Evan Hand <elhandjr@...> wrote:
Sorry to nit pick, however I do not know where to get 680nF inductors, only 680nH inductors.  I assuming that you do mean the 680 nanoHenry inductors that were suggested by Raj, vu2zap in this thread:
https://groups.io/g/BITX20/topic/27154925#60568

That is unless I missed something about a part number.

Also, the relay and or off board filters do not address the spurs issues, only the harmonics issues.  The 2 spur fixes are either the shielded SMD inductors per Raj, or the Ashhar v5 fix with an LCL low pass filter before the last mixer in the transmitter chain.

It should be noted that there seems to be less harmonics when using SSB, but higher spurs on the upper bands.  For CW, Harmonics on the lower bands, and less on upper bands with little reported spurs on any band. 

This goes along with what I have been able to measure, though I do not trust the spurs testing that I did due to a poor RBW on the spectrum analyzers that I had at my disposal at the time.

73
Evan
AC9TU



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL

Dale Hardin
 

MadRadioModder, that would be too easy.  I am not an electronics expert, only a builder and tinkerer.  I will learn more from modding the V3 than I will ever learn from assembling the V5.  Just my thing, I guess.  I just enjoy the build.  Funny comment, though.  Dale

On Sat, Sep 21, 2019 at 6:09 PM MadRadioModder <madradiomodder@...> wrote:

An easier fix is to sell the V3 and buy a V5.  Boom.  Done.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dale Hardin
Sent: Saturday, September 21, 2019 5:10 PM
To: BITX20@groups.io
Subject: Re: [BITX20] WTB 680nF Inductors #parts

 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

 

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:

Hi Dale,

 

Not to discourage You from doing this,  but my experience with replacing the toroids with the 680nF SMDs showed no change whatsoever. I have photos of the spectrum analyser screens before and after and they are pretty much identical.  But maybe this is because i haven't done the relay replacement modification yet...?

 

Best Regards,

Jonas - SM4VEY

 

Den lör 21 sep. 2019 kl 13:22 skrev Dale Hardin <joe.dale.hardin@...>:

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL


 

--

Dale Hardin

24750 State St. Unit 487

Elberta, AL 36530
251-597-9256


--
Dale Hardin, KS4NS
Elberta, AL


Virus-free. www.avg.com

--

…_. _._



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL

 

I've tried similar ones and they DONT work. The issue with the original toroids is that
their leads seem to pick up TX signal and cause a mess.

Change the relays and you are almost there. Use SHIELDED smd insuctors and you
will get reduction in spurs. Any old inductor there wont do.

If the 680nh does not help then you have the wrong type.

Raj


At 21-09-19, you wrote:
I bought these, and reasonably-shipped:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F352066947527


Ted
k3rta

Dale Hardin
 

Raj, l don't want to have to buy 100 off eBay, so that's why I am looking to find the parts on the group.  Regards, Dale



On Sun, Sep 22, 2019, 2:08 AM Raj vu2zap <rajendrakumargg@...> wrote:
I've tried similar ones and they DONT work. The issue with the original toroids is that
their leads seem to pick up TX signal and cause a mess.

Change the relays and you are almost there. Use SHIELDED smd insuctors and you
will get reduction in spurs. Any old inductor there wont do.

If the 680nh does not help then you have the wrong type.

Raj

At 21-09-19, you wrote:
I bought these, and reasonably-shipped:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F352066947527


Ted
k3rta


--
Dale Hardin, KS4NS
Elberta, AL

 

Hi,

Not to complicate matters, but in old posts I've seen two different inductors being discussed:  680nH ones on a filter, and 680uH ones placed on the relays.  Has anyone tested either of those strategies to show measured reductions in the problem spurs on SSB in the higher frequency bands?  I also recall others saying that the 680nH filter inductors were causing fairly significant power reduction on 40m -- was this always the case or has the modification worked for some and not for others (depending on what)?

73,


Mark.

Curt
 

Mark

I am thinking that the impact of substituting 680 nH shielded inductors for the toroids on the 45 MHz can be checked by monitoring a 28 MHz beacon (if you are where you can hear one) or by measuring SSB transmit output on an upper band.  I have some shielded inductors to try, but not yet installed.  Yes I am reading Raj that these are a good thing to reduce leakage that may cause more than one malady, and maybe with Axicom relays in might mitigate these mixer spurious. 

I did not find any improvement using the LC filter that was recommended, without other fixes for mixer spurious.  I sense they may be a small impact, but of course part of the v5 fix. 

I did try a second 45 MHz crystal filter - and this wrecked my low band CW transmit output.  Perhaps installing the shielded inductors may allow the second xtal filter to work, a path I plan to try. 

Meanwhile my harmonic spurious are good, using Gordan's board. 

Curt

 

Hi Curt,

Thank you for the information.  It is good to hear more about fixing the mixer spurs.

My harmonic spurious are also good, using Alison's relay mod on the wiki and the original relays.

73,


Mark.