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ricevitore HF
[[Category:radio]]
''un ricev(trasmett)itore HF cosi piccolo da poterlo custodire comodamente tra le fauci''


* piccolo
* piccolo
* economico
* economico
* a basso consumo (<100ma)
* a basso consumo (<100ma rx)
* a bassa tensione (3.3v)
* a bassa tensione (3.3v o 5v)


== VFO ==


== Sezioni ==
Basta un [[Ondeggiatore]]!


=== Filtro di ingresso ===
=== Quadratura ===


di tipo LC. puo essere un singolo passa basso da 0 Hz alla banda piu alta che ci interessa, oppure dei banchi passa-banda commutabili.
[http://www.ti.com/product/sn74lvc74a sn74lvc74a] 1.65 V to 3.6 V, tpd of 5.2 ns at 3.3 V


per quanto riguarda i passa basso costruiti con toroidi facilmente reperibili un buon riferimento e' http://www.gqrp.com/technical2.htm
== Demodulatore ==


io sarei incline a mettere filtri dimensionati per reggere in futuro un piccolo trasmettitore (<5W)
Basta un [[Laterizio]]!


si puo fare una scheda che monta N filtri modulari e provvede a commutarli
== Mixer ==


=== Miscelatore ===
=== Gilbert-cell ===
 
Una cella di gilbert implementata con un array di bipolari: regge piu di un mosfet dual-gate e consuma meno di un ring di diodi


HFA3101 http://www.intersil.com/en/products/amplifiers-and-buffers/transistor-arrays/transistor-arrays---gilbert-cell-uhf/HFA3101.html
HFA3101 http://www.intersil.com/en/products/amplifiers-and-buffers/transistor-arrays/transistor-arrays---gilbert-cell-uhf/HFA3101.html


=== Diplexer ===
=== DGMOS ===
 
http://sm0vpo.com/blocks/mixers-1.htm
 
ma sembrano introvabili a 3.3
 
=== Commutativi ===
 
* http://www.oe1ira.at/sl/mix.html
* http://www.phonestack.com/farhan/mixermusings.pdf
* http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm
 
occhio al bias!
* http://www.m0rjd.co.uk/bus-switches.html
* http://www.spinelectronics.eu/ftp/SDR/IK1ODO_SDR1.html
 
==== Topologie ====
===== Subarmonic =====
 
* Polyakov [https://soldersmoke.blogspot.com/2010/03/polyakovs-russian-mixer.html 1], [https://www.qsl.net/pa2ohh/11qrx.htm 2]
 
===== QSD =====
 
* http://www.waves.utoronto.ca/prof/svhum/ece422/sdr/qsd.html
* http://kc.flexradio.com/KnowledgebaseArticle50193.aspx SDR1000
* http://martein.home.xs4all.nl/pa3ake/hmode/IF_detector_qsd.html
* http://www.itsrainingelephants.com/blog-archives/tag/adg704/
* http://www.m0nka.co.uk/wp-content/uploads/2016/03/rx_mixer.pdf
* http://www.m0rzf.co.uk/resources/QSD.pdf
 
===== H-mode =====
 
ma uscire in audio da un trasformatore e' grigia
 
* http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm#The%20QRSS%20Mixer. questo ha l'uscita audio
* http://martein.home.xs4all.nl/pa3ake/hmode/fsav430.html ma l'fsav430 pare semiintrovabile
* http://www.qsl.net/g3oou/solidstatecircuits9.html con due SPDT
* magari in versione 2T
** http://martein.home.xs4all.nl/pa3ake/hmode/2t-hmode.html
** http://www.arifidenza.it/forum/topic.asp?TOPIC_ID=81490
 
===== Bilanciati =====
 
# http://home.snafu.de/graff/sbt40.pdf rf splittata a condensatori, LO split a porte logiche
# http://yu1lm.qrpradio.com/HF%20SDR%20RECEIVER%20CW-SSB-DRM%20YU1LM.pdf
#* RF sbilanciata
#* LO + !LO
#* OUT bilanciato
#* si puo reimplementare con un singolo SPDT
# http://www.qrp.pops.net/K7LR-Memorial.asp
#* RF bilanciata (a trasformatore)
#* un dual spst
#* OUT sbilanciato
#* simile a https://lz3nf.wordpress.com/2013/07/25/280/
 
==== Componenti ====
 
* [http://www.ti.com/product/ts3a4751 ts3a4751] 0.9 Ohm Low-Voltage Single-Supply Quad SPST Analog Switch tON = 14 ns, tOFF = 9 ns
* http://www.analog.com/en/switchesmultiplexers/analog-switches/adg711/products/product.html
* Dual 2:1
** [http://www.ti.com/product/ts5a623157 ts5a623157] 10-Ohm, With Undershoot/Overshoot Voltage Protection
** [http://www.ti.com/product/ts5a23159 ts5a23159] 1-Ohm, Break-Before-Make, 5V/3.3V, Ton 8ns, Toff 5ns
** [https://www.ti.com/product/TS3A24159 TS3A24159] 0.3-Ω, Break-Before-Make, 1.65-V to 3.6-V, Ton 20ns, Toff 12ns
* Quad 2:1
** [http://www.ti.com/product/SN74CBT3257 SN74CBT3257] 4 poli 2 vie, 500Mhz, 4-5.5v, 4Ω
*** [https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740323%20K3s%20Schematic%20Files.pdf K3S] 
*** [https://ftp.elecraft.com/KX2/Manuals%20Downloads/E740324%20KX2%20Schematic%20Files%20RevA.pdf KX2] ne usa due in RX, ognuno RF in bilanciato, out bilanciato
*** [https://ftp.elecraft.com/KX3/Manuals%20Downloads/KX3SchematicDiagramDec2012.pdf KX3] ne usa due
** SN74CB3Q3257 versione a 3.3v, 500Mhz, 4Ω, con pompa di carica (potenzialmente rumorosa)
** SN74CBTLV3257 bw 200 mhz, 5Ω, senza pompe di carica
* Dual 1:4
** [http://www.ti.com/lit/pdf/scds018 SN74CBT3253] usato da [http://www.telepostinc.com/LP-PAN2-Manual.pdf LP-PAN2]
** [http://www.onsemi.com/PowerSolutions/product.do?id=FST3253 FST3253] usato da [http://fivedash.com/resource/RXTXEnsembleSchematic.pdf softrock] (uscita sbilanciata), [http://qrp-labs.com/receiver qrplabs], [http://www.jumaradio.com/juma-trx2/ JUMA-TRX2] (entrata bilanciata e uscita bilanciata) e [https://ftp.elecraft.com/KX2/Manuals%20Downloads/E740324%20KX2%20Schematic%20Files%20RevA.pdf KX2] (in TX) Esistono anche [http://www.ti.com/product/sn74cbt3253 sn74cbt3253] 5v, 200mhz, 5Ω e [http://www.ti.com/product/sn74cbtlv3253 sn74cbtlv3253] 3.3, 200mhz, 5Ω
** http://www.ti.com/product/TS3A5017/description, 165mhz, 11Ω
** [http://www.mouser.com/ds/2/149/FSAV331-112579.pdf FSAV331] usato in [https://martein.home.xs4all.nl/pa3ake/hmode/IF_detector.html pa3ake IF_detector board] e PI5V331 o [https://www.idt.com/document/dst/qs4a210-datasheet QS4A210] in [http://www.arrl.org/files/file/Technology/tis/info/pdf/030304qex020.pdf SDR-1000]  (BAL-BAL)
* http://www.analog.com/en/switchesmultiplexers/multiplexers-muxes/adg704/products/product.html SP4T, 2.5 Ω, +1.8 V to +5.5 V
 
== Diplexer ==


sul diplexer che segue il mixer si gioca buona parte della dinamica del ricevitore
sul diplexer che segue il mixer si gioca buona parte della dinamica del ricevitore
Line 29: Line 110:
http://www.qrp.pops.net/dip2.asp
http://www.qrp.pops.net/dip2.asp


=== Amplificatore audio ===
* http://www.qrp.pops.net/dip_sup.asp
* http://www.tuberadio.com/new.html
* http://www.vk6fh.com./vk6fh/DIPLEXER%201.htm
* http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/radcom/1991/04/page39/
* http://www.qsl.net/g3oou/mixerterminations.html
* http://www.seboldt.net/k0jd/r2pamp.txt
 
== Filtri RF ==
 
set di filtri passa banda LC commutabili (<5W)
 
* http://www.gqrp.com/technical2.htm
* http://martein.home.xs4all.nl/pa3ake/hmode/bpf_intro.html
 
== Commutazione LP e PA ==
 
i sistemi di commutazione praticabili sono:
 
=== meccanico ===
* commutatore meccanico: problemi di cablaggio e di contatti
* microrelays DIP: consumano abbastanza e hanno problemi di contatto (a meno di non implementare il 'DC wetting', non sembrano esistere per 3.3v
 
=== stato solido ===
* http://www.psemi.com/products/rf-switches
* diodi PIN: consumano molto, non sembrano esistere per 3.3v
* FET discreti:
** http://www.n5ese.com/tr_switch.htm
** ci sono pochi FET con Vgth < 3.3v che lavorino bene ad alta frequenza:
*** http://www.st.com/web/catalog/sense_power/FM100/CL824/SC1164/PF253858
* Bus/Analog Switch: hanno una Ron non indifferente, non reggono segnali molto forti, lavorano malino a 3.3v
** http://www.m0rjd.co.uk/bus-switches.html
** http://martein.home.xs4all.nl/pa3ake/hmode/IF_switches.html
** https://w3jdr.wordpress.com/fst3253-bus-switch-as-an-rf-switch/
** http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slyb125
** http://www.ti.com/product/ts3a4751 0.9-Ω LOW-VOLTAGE SINGLE-SUPPLY QUAD SPST ANALOG SWITCH
** http://www.maximintegrated.com/datasheet/index.mvp/id/3351 MAX4734 0.8Ω, Low-Voltage, 4-Channel Analog Multiplexer
* Amp Buffer integrati
** Una via (solo rx)
** ABA32563 http://www.avagotech.com/pages/en/rf_ics_discretes/rf_ics/silicon_amplifiers_gain_blocks/aba-32563/ reperibili a poco, bevono 37ma
 
letture:
 
* http://www.skyworksinc.com/downloads/press_room/published_articles/MPD_062009.pdf
* http://www.skyworksinc.com/downloads/press_room/published_articles/MPD_052009.pdf
* http://www.m0rzf.co.uk/softrock7/
 
== Amplificatore audio ==
 
=== Preamp e filtro LP ===


LVM772 http://www.ti.com/product/lmv772
* bilanciato
** http://www.ti.com/product/ths4532 Dual, Ultra low power 0.25mA, RRO, fully differential amplifier
* sbilanciato
** LVM772 http://www.ti.com/product/lmv772
** [http://www.ti.com/product/tl974 TL974] oppure [http://www.st.com/content/st_com/en/products/amplifiers-and-comparators/operational-amplifiers-op-amps/automotive-op-amps/ts972.html ts974] low noise 4nV/√Hz - 2.7-10v
** OPA365 http://www.ti.com/product/opa365  2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier
** ADA4692-2 http://www.analog.com/en/all-operational-amplifiers-op-amps/operational-amplifiers-op-amps/ada4692-2/products/product.html  Low Power, Wideband, Low Noise, Rail-to-Rail Output, Dual Op Amp


=== VFO ===
=== PA ===


AD9834 http://www.analog.com/en/digital-to-analog-converters/direct-digital-synthesis-dds/ad9834/products/product.html
* TPA2005D1 https://focus.ti.com/docs/prod/folders/print/tpa2005d1-q1.html
* LM4667 http://www.ti.com/product/lm4667
* SSM2305 http://www.analog.com/en/audiovideo-products/audio-amplifiers/ssm2305/products/product.html


l'uscita del DDS va fatta passare per un 'filtro di ricostruzione', che tagli via per quanto possibile le spurie e le armoniche di campionamento del DAC
== PA RF ==


si puo copiare da questo: http://www.pongrance.com/super-dds.html che pero ha un clock di 80mhz (cambia poco)
* RD06HVF1
* RD02LUS2 470MHz,2W
* [http://www.st.com/content/st_com/en/products/radio-frequency-transistors/rf-ldmos-transistors/7v-rf-ldmos-hf-to-2ghz/pd54008-e.html PD54008] 8 W with 11.5dB gain @ 500 MHz/7.5 V


=== uC ===
== LDO ==


PIC24F04KA200 http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en542037
* http://www.st.com/content/st_com/en/products/power-management/linear-voltage-regulators/low-dropout-ldo-linear-regulators/ld2985.html 280 mV at 150 mA and 7 mV at 1 mA, inhibit function


* riceve l'input dai tasti (6 pin)
== Layout ==
* controlla il LCD (6 pin)
* controlla il DDS (2 pin)


==== Mappa pin ====
=== Baseband ===
* mic preamp & lowpass
* lowpass & audio pa
* [[Laterizio]]


{|style="color:green; background-color:#ffffdd;" cellpadding="10" cellspacing="0" border="1"
=== LO & Mix ===
!Pin
* LO [[Ondeggiatore]]
!Funzione
* 90' squarer
!Nome
* QSD/E
!porta sul uC
|-
|1|| || ||MCLR/VPP/RA5
|-
|2|| || ||PGC2/AN0/VREF+/CN2/RA0
|-
|3|| || ||PGD2/AN1/VREF-/CN3/RA1
|-
|4|| || ||OSCI/CLKI/AN4/C1INB/CN30/RA2
|-
|5|| || ||OSCO/CLKO/AN5/C1INA/CN29/RA3
|-
|6|| || ||PGD3/SOSCI/AN2/C2INB/HLVDIN/CN1/RB4
|-
|7|| || ||PGC3/SOSCO/AN3/C2INA/T1CK/CN0/RA4
|-
|8|| || ||SCL1/U1CTS/SCK1/CN22/RB8
|-
|9|| || ||SDA1/U1BCLK/U1RTS/SDO1/CN21/RB9
|-
|10|| || ||OC1/IC1/C2OUT/INT2/CTED1/CN8/RA6
|-
|11|| || ||AN10/CVREF/U1TX/SDI1/OCFA/C1OUT/INT1/CTED2/CN12/RB14
|-
|12|| || ||REFO/U1RX/SS1/T2CK/T3CK/INT0/CTPLS/CN11/RB15
|-
|13|| || ||VSS
|-
|14|| || ||VDD
|}


== Firmware ==
=== Frontend ===
* PA RF
* band filter
* RX attenuator
* T/R switch

Latest revision as of 13:29, 19 June 2019

un ricev(trasmett)itore HF cosi piccolo da poterlo custodire comodamente tra le fauci

  • piccolo
  • economico
  • a basso consumo (<100ma rx)
  • a bassa tensione (3.3v o 5v)

VFO

Basta un Ondeggiatore!

Quadratura

sn74lvc74a 1.65 V to 3.6 V, tpd of 5.2 ns at 3.3 V

Demodulatore

Basta un Laterizio!

Mixer

Gilbert-cell

Una cella di gilbert implementata con un array di bipolari: regge piu di un mosfet dual-gate e consuma meno di un ring di diodi

HFA3101 http://www.intersil.com/en/products/amplifiers-and-buffers/transistor-arrays/transistor-arrays---gilbert-cell-uhf/HFA3101.html

DGMOS

http://sm0vpo.com/blocks/mixers-1.htm

ma sembrano introvabili a 3.3

Commutativi

occhio al bias!

Topologie

Subarmonic
  • Polyakov 1, 2
QSD
H-mode

ma uscire in audio da un trasformatore e' grigia

Bilanciati
  1. http://home.snafu.de/graff/sbt40.pdf rf splittata a condensatori, LO split a porte logiche
  2. http://yu1lm.qrpradio.com/HF%20SDR%20RECEIVER%20CW-SSB-DRM%20YU1LM.pdf
    • RF sbilanciata
    • LO + !LO
    • OUT bilanciato
    • si puo reimplementare con un singolo SPDT
  3. http://www.qrp.pops.net/K7LR-Memorial.asp

Componenti

Diplexer

sul diplexer che segue il mixer si gioca buona parte della dinamica del ricevitore

http://www.qrp.pops.net/dip2.asp

Filtri RF

set di filtri passa banda LC commutabili (<5W)

Commutazione LP e PA

i sistemi di commutazione praticabili sono:

meccanico

  • commutatore meccanico: problemi di cablaggio e di contatti
  • microrelays DIP: consumano abbastanza e hanno problemi di contatto (a meno di non implementare il 'DC wetting', non sembrano esistere per 3.3v

stato solido

letture:

Amplificatore audio

Preamp e filtro LP

PA

PA RF

  • RD06HVF1
  • RD02LUS2 470MHz,2W
  • PD54008 8 W with 11.5dB gain @ 500 MHz/7.5 V

LDO

Layout

Baseband

  • mic preamp & lowpass
  • lowpass & audio pa
  • Laterizio

LO & Mix

Frontend

  • PA RF
  • band filter
  • RX attenuator
  • T/R switch
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