Date   
Re: Harmonics and Relay Replacement

Matthias Zwoch
 

Mounted the AXICOM V23105-A5303-A201 this evening. Replaced all HFD27. And bingo - the harmonics on 3,5 / 7 /10.5 meet the german RegTP requirements (-40 dB). Would also meet the -43 FCC limit. For the higher bands I will test later. Need the HP boatanchors at our local club for that. Bought the relais from the ebay seller "breconjess" UK.
So the first problem is solved. Next are the spur fixes, then AGC...

73 Matthias, DD7NT

Re: I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

Dave Dixon
 

Hello John
                the boards are by N6 DT and come with all componants plus circuit diagram, $10 is fine for one full set of agc...pop fix boards, plus post to your country ill ifnd out what that is.regards Dave.

On Mon, 15 Oct 2018 at 16:58, John Lauber <jlauber@...> wrote:

Will you take $10?  I’ll pay with PayPal.

John

WI6P

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Dave Dixon
Sent: Monday, October 15, 2018 08:03
To: BITX20@groups.io
Subject: [BITX20] I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

 

 

Re: I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

Dave Dixon
 

the AGC & POP fix boards are by N6 DT..

On Mon, 15 Oct 2018 at 16:58, John Lauber <jlauber@...> wrote:

Will you take $10?  I’ll pay with PayPal.

John

WI6P

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Dave Dixon
Sent: Monday, October 15, 2018 08:03
To: BITX20@groups.io
Subject: [BITX20] I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

 

 

Re: Recommended fixes on ubitx.net

Don - KM4UDX
 

Jerry - thank you so much for the positive words. The encouragement is much appreciated. I may have contributed to my own problems by overdriving the audio via my sound card or ground loops, etc.  So I'm building an easy Digi board and I'll figure out the appropriate drive levels. 

And go from there!

Thanks again.

Don
Km4udx 

Re: Harmonics and Relay Replacement

a.vision
 

Thanks Nigel appreciated



Sent from my Samsung Galaxy smartphone.

-------- Original message --------
From: Nigel G4ZAL <nigel@...>
Date: 15/10/2018 17:03 (GMT+00:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Harmonics and Relay Replacement

This seller on ebay UK is selling packs of 2 or 4 - I grabbed some 4's ;-)

https://www.ebay.co.uk/itm/331766915816

Nigel

Re: Harmonics and Relay Replacement

MVS Sarma
 

Even RS componenets have them
 I had ordered on in.rsdelivers.com


On Mon, Oct 15, 2018 at 9:33 PM Nigel G4ZAL <nigel@...> wrote:
This seller on ebay UK is selling packs of 2 or 4 - I grabbed some 4's ;-)

https://www.ebay.co.uk/itm/331766915816

Nigel

Re: Harmonics and Relay Replacement

Nigel G4ZAL
 

This seller on ebay UK is selling packs of 2 or 4 - I grabbed some 4's ;-)

https://www.ebay.co.uk/itm/331766915816

Nigel

Re: I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

 

Will you take $10?  I’ll pay with PayPal.

John

WI6P

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Dave Dixon
Sent: Monday, October 15, 2018 08:03
To: BITX20@groups.io
Subject: [BITX20] I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

 

 

Re: I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

Nigel G4ZAL
 

Hi Dave,

Depending on which version(s) you have, I’d be interested in a set

Nigel - G4ZAL

I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD

Dave Dixon
 


Re: uBITX40 : audio is meowing and not understandable.

Ian Reeve
 

I have verion 3 of the uBITX and find that very accurate setting of the vfo via the menu is required. You may find you have to adjust it a bit, mine is set at 11.9972

 

I also have had no audio issues with this soldered in TDA2822,producing ample clear audio through the supplied speaker.

 

Ian M0IDR

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Toni Cossio <a.cossio@...>
Sent: Monday, October 15, 2018 2:45:58 PM
To: BITX20@groups.io
Subject: [BITX20] uBITX40 : audio is meowing and not understandable.
 

I need help to solve a malfunction.
I have a version 3 kit with the famous TDA 2822 in the WX version which for the moment does not produce smoke and the output is good.
The problem is that in SSB, even with strong signals, the audio is meowing and not understandable.
The same problem with 8/16 and 20 ohm speakers.
What can I do?
Thanks for the appreciated advice.
73 de IV3XHM, Toni

Re: Buy in INDIA

Doug W
 

India is a big place.  Mumbai is about 700km from the home of the BITX.
--
www.bitxmap.com

uBITX40 : audio is meowing and not understandable.

Toni Cossio
 

I need help to solve a malfunction.
I have a version 3 kit with the famous TDA 2822 in the WX version which for the moment does not produce smoke and the output is good.
The problem is that in SSB, even with strong signals, the audio is meowing and not understandable.
The same problem with 8/16 and 20 ohm speakers.
What can I do?
Thanks for the appreciated advice.
73 de IV3XHM, Toni

Re: Harmonics and Relay Replacement

a.vision
 


Hi Nigel do you have a link for your UK supplier Thanks Graham


Sent from my Samsung Galaxy smartphone.

-------- Original message --------
From: Nigel G4ZAL <nigel@...>
Date: 15/10/2018 12:45 (GMT+00:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Harmonics and Relay Replacement

With reference to the article, where the AXICOM type D2n V23105-A5476-A201 is described as the best relay
http://www.i1wqrlinkradio.com/antype/ch97/chiave50.htm

I have located some of these in the UK as they are British Telecom specified relays with coil resistance of 280 ohms and power consumption of 515mW and operating current of 27mA
I paid  just under 1GBP each, (US$1.30) delivered.
Relay spec (scroll down to find the BT spec)
https://www.qsl.net/on7eq/pdf/axicom_dil_hf_relays.pdf

I have no means of testing the harmonic difference before and after installation, but hope they will not upset anything with the extra power demand?

Nigel - G4ZAL

Re: Harmonics and Relay Replacement

Nigel G4ZAL
 

With reference to the article, where the AXICOM type D2n V23105-A5476-A201 is described as the best relay
http://www.i1wqrlinkradio.com/antype/ch97/chiave50.htm

I have located some of these in the UK as they are British Telecom specified relays with coil resistance of 280 ohms and power consumption of 515mW and operating current of 27mA
I paid  just under 1GBP each, (US$1.30) delivered.
Relay spec (scroll down to find the BT spec)
https://www.qsl.net/on7eq/pdf/axicom_dil_hf_relays.pdf

I have no means of testing the harmonic difference before and after installation, but hope they will not upset anything with the extra power demand?

Nigel - G4ZAL

Re: Buy in INDIA

iz oos
 

Taxes may make the difference and it is well possible you buy goods at more favorably prices (and sometimes of better quality) outside the country. It's called microeconomics.


Il 15/ott/2018 12:10, "Dexter N Muir" <dexy@...> ha scritto:
By any god/s you care to name! I'd be astonished to find NZ produce cheaper overseas! What sort of upside-down system are you living in?

Re: Buy in INDIA

Christopher Miller
 

I would be willing to pay extra just for the chance to meet ashar.

KF4FTR

Re: Buy in INDIA

Dexter N Muir
 

By any god/s you care to name! I'd be astonished to find NZ produce cheaper overseas! What sort of upside-down system are you living in?

Re: Simpler spur fix

Hans Summers
 

All

Be careful using SMD inductors in Low Pass Filters: they may have trouble handling the required power, and the lower Q may affect the filter characteristics. 

Also be careful using SMD inductors in Band Pass Filters and Low Pass Filters because they will more easily saturate, this will limit the dynamic range and IP3 of the receiver. The lower Q will also increase the insertion loss of some Band Pass Filter designs.

SMD inductors may also lack the inherent self-shielding properties of the toroidal inductor shape. 

This page https://martein.home.xs4all.nl/pa3ake/hmode/ is a very educational study on what size toroids are necessary to avoid them becoming the limiting factor for dynamic range and IP3. But you need a very good mixer otherwise the mixer is already limiting the performance.  
 
In the uBITX the dynamic range and IP3 are already limited elsewhere so the type of inductor used is not likely to be a limiting factor. 

SMD or pre-wound axial inductors make things easy. But toroids make things high performance. Everything being a trade-off as usual. 

73 Hans G0UPL


Re: Harmonics and Relay Replacement

Matthias Zwoch
 

Am 14.10.2018 um 23:57 schrieb Joe Puma:
Yea but changing the relays looks like the real winner here.
Hello Joe,

It is not a big problem to get the HFD27 desoldered. A good desolder litz (I used 2,5mm from Felder) and a bit judding and pulling an they will come out without any damages at the PCB and the relais. Desoldered all 5. They will go in the scrapbox and this evenig the AXICOMs will take their places.

73, Matthias DD7NT