er der nogen som kender til en billig frekvenstæller den skal min. kunne tælle til 1GHz og kunne måle i syntheser osv.
"så det nytter ikke noget at den kun kan måle et 5V TTL signal :)"
ydermere leder jeg efter en spektrum analysator sådan en man kobler til sit scop i XY modus denne må gerne kunne måle til 1GHz også men ihverfald 500MHz er et krav
kan man få sådan noget som byggesæt syntes kun at jeg kan finde alt muligt halvfærdigt rundt omkring
om end ikke byggesæt så bare et sted man kan købe det billigt, måske brugt ?
Du b=F8r ogs=E5 se p=E5 Bygges=E6t fra Velleman (f.eks. hos=20
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) udover adresser og referencer herunder.
Her er nogle internet adresser - kig under overskriften "Reparation og=20 m=E5leteknik":
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Her er nogle =E6ldre BibTex formaterede referencer du kunne se p=E5, hvis= du=20 er nysgerrig. Der st=E5r hvilke kredse de hovedsageligt er baseret p=E5. =
Check is=E6r de nyere artikler:
"Billig" 200MHz diagram - tilsluttes et oscilloskop: @article{, author =3D "Glyn Roberts", title =3D "=A3100 winner: 200MHz spectrum analyser displays to -75dB= ", journal =3D "Electronics World & Wireless World", pages =3D "500--501", year =3D "1996", publisher =3D "Reed Elsevier group", url =3D "
Du b=F8r g=E5 efter low-power prescaler kredse som anvendes i mobiltelefo= ner=20 eller satellit (DBS) modtagere. Du skal enten selv finde prescalerens=20 datablad (check om prescaleren opfylder dine krav) eller bede om at f=E5 =
databladet medsendt ved k=F8b.
Nogle specielle kredse (nyere low-power prescalere) kan bestilles hos=20
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eller
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- hvis de kan=20 skaffes via deres kontakter (mod forudbetaling).
Eksempler p=E5 prescalers/s=F8gninger:
Barend Hendriksen HF Electronics. RF and special electronics for the world:
Datasheet Library - Prescalers. Harry Lythall - SM0VPO:
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ON Semiconductor (firmanavn) Prescaler (PLL):
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Henkel Microwave Spectrum ANALYZER ON A BUDGET:
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Citat: "...
1[,]7 GHz prescaler [MC12079 baseret (=3DMB506 / UPB1505 ?)] =2E.. Referencer: Robert Richardson, W4UCH, "Low cost Spectrum Analyzer with Kilobuck=20 Features," Ham Radio, September 1986, page 82. =2E.."
MECL PLL COMPONENTS =F7 64/128/256 PRESCALER:
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MC12095 2.5 GHz Low Power Prescaler With Stand-By Mode:
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MC12093 =F7 2, =F7 4, =F7 8 1.1 GHz Low Power Prescaler with Stand-By:
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ZL40800 6 GHz Fixed Modulus Divide 8 Prescaler:
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October 2003. Multi-Modulus Divider IC Covers DC - 40 GHz Range;=20 Features Simultaneous Divide-by - 2/4/8 Outputs:
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VHF/UHF Prescaler (Philips SAB6456A):
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Citat: "...The recommended Prescaler is ridiculously simple. It consists =
of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can=20 divide by 64 or by 256. This chip is widely available both new and in=20 the surplus market at much lower prices than conventional divide by 10=20 prescalers. =2E.. [Disse noter g=E6lder sikkert ogs=E5 andre prescalere:] =2E.. Note: # It is quite normal for the SAB6456A prescaler device to oscillate=20 lightly at about 60 - 70 MHz when there is no input signal. This effect=20 is described in the Philips data sheet. It is easy to tell when this is=20 happening, because the reading will not be stable. As soon as a good=20 signal is received, the oscillation stops. The Counter is of course=20 completely stable at all times. # The prescaler may be more stable with no input if the input is=20 terminated by a 50 Ohm resistor, however this will be at the cost of=20 some sensitivity. # Be careful not to overload the device. The maximum input is 300mV, so=20 do not connect the Prescaler directly to a transmitter or exciter. =2E.."
Andre:
1 GHz Prescaler:
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April 2000 Microwave Prescaler Works With Little Power:
Her er endnu en PIC baseret frekvenst=E6ller - ogs=E5 med diagram og pres= caler.
UNIVERSAL FREQUENCY COUNTER 1.3GHz:
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Program pro PIC16F84 [Objektkode/hex]:
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Tjekkisk hovedadresse:
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Hovedadresse har nogle interessante konstruktioner med engelske/franske=20 beskrivelser. Klik p=E5 billederne for mere information. De fleste=20 pdf-filer er p=E5 engelsk selvom web-sidens titler er p=E5 tjekkisk:
Her er endnu en PIC baseret frekvenst=E6ller med god beskrivelse, diagram= =20 og assembler-kildekode(godt kommenteret - p=E5 tysk) - med og uden presca= lere:
1-GHz-Frequenzz=E4hler mit 16F84 und LCD-Display:
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Frequenzanzeige f=FCr einen UKW-Empf=E4nger mit 16F84 und LCD-Display:
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50 MHz-Frequenzz=E4hler mit 16F84 und LCD-Display:
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PIC baseret frekvenst=E6ller med diagram og hex-kode - SAB6456 prescaler =
baseret:
1 GHz Counter. This simple counter is useful for frequency measurements of various=20 wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band:
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Citat: "... Features
1-) Display range: 0,0 to 999,9 MHz, resolution 0,1 MHz
2-) Correct rounding, reduced blinking of last digit
3-) Over-range indication
4-) Fast measurement - short measuring period
5-) High input sensitivity in VHF/UHF band
6-) Switchable 10,7 MHz intermediate frequency offset for use with receiv= er =2E.."
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