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Re: Harmonics and Relay Replacement
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 |
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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:
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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:
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Re: Recommended fixes on ubitx.net
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? |
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Re: Harmonics and Relay Replacement
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-------- Original message -------- From: Nigel G4ZAL <nigel@...> Date: 15/10/2018 17:03 (GMT+00:00) Subject: Re: [BITX20] Harmonics and Relay Replacement Nigel |
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Re: Harmonics and Relay Replacement
Even RS componenets have them ?I had ordered on 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 ;-) |
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Re: I HAVE 2 AGC AND POP FIX BOARDS COMPLETE WITH DIAGRAMS FOR SALE.MAKE ME AN OFFER DAVE G0AYD
John Lauber
¿ªÔÆÌåÓýWill you take $10?? I¡¯ll pay with PayPal. John WI6P ? From: [email protected] <[email protected]> On Behalf Of Dave Dixon ? ? |
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Re: uBITX40 : audio is meowing and not understandable.
Ian Reeve
¿ªÔÆÌåÓýI 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 for Windows 10 ? From: [email protected] <[email protected]> on behalf of Toni Cossio <a.cossio@...>
Sent: Monday, October 15, 2018 2:45:58 PM To: [email protected] Subject: [BITX20] uBITX40 : audio is meowing and not understandable. ?
I need help to solve a malfunction. |
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uBITX40 : audio is meowing and not understandable.
I need help to solve a malfunction. |
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Re: Harmonics and Relay Replacement
¿ªÔÆÌåÓýHi 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) Subject: Re: [BITX20] Harmonics and Relay Replacement 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) 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 |
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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
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) 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 |
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Re: Buy in INDIA
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? |
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Re: Simpler spur fix
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? 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 |