[Moon] Best IF for 23 cm transverter

Rainer df6na at df6na.de
Thu Jul 26 13:32:53 CEST 2018


where is the problem?
https://www.kuhne-electronic.de/kuhne/en/shop/converter-transverte/transverter/MKU+BPF+1+3++SMA++Interdigital+Filter+1296+MHz/?card=1457

Am 26.07.2018 um 12:29 schrieb Don Hawbaker via Moon:
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> 		The advertisement for the 1296/28 transverter specifically warns that external filters are needed.
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> On Thu, Jul 26, 2018 at 5:50 AM -0400, "DW Harms (Dick)" <qtc at kpnmail.nl> wrote:
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> Ton,
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> A higher IF is usually only important if the mirror surpression and selectivity of your transvertor is marginal. With Kühne transvertors there is nothing to worry about this, only your wallet will protest a bit hi!
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> I use 28 MHz for all my Kühne transvertors and it works excellent.
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> 73, Dick PA2DW
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>> Op 26 jul. 2018 om 11:33 heeft dfaessler via Moon  het volgende geschreven:
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>> ..its not stupid.Some SDRs like 28 MHz
>> 73 DominiqueHB9CW
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>> Von meinem Samsung Galaxy Smartphone gesendet.
>> -------- Ursprüngliche Nachricht --------Von: Don Hawbaker via Moon  Datum: 26.07.18  11:09  (GMT+01:00) An: Ton PA0TBR , moon at moonbounce.info Betreff: Re: [Moon] Best IF for 23 cm transverter
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>>         Why do you want to use 28 MHz?  As you say, many suppliers use 144, so I do not see any advantages in using 28.
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>> On Thu, Jul 26, 2018 at 3:49 AM -0400, "Ton PA0TBR via Moon"  wrote:
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>> I want to convert 1296 MHz to/from 28 MHz (or higher but less than 54 MHz).
>> I see 2 options:
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>> 1) Kuhne has transverters that will convert directly to/from 28 MHz but I
>> assume that I need interdigital filters to stop the 1268 MHz mixer
>> frequency and 1240 MHz image frequency.
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>> 2) Many suppliers mix to/from 144 MHz, which implies that I need a 2nd
>> transverter for 144 to/from 28 MHz.
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>> Which option is technically preferred?
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>> 73,
>> Ton pa0tbr
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