Station & Antenne



JRC NRD-93 & JRC NDH-93 Scanning Unit
RFT EKD 500 & Preselector EZ 100
SDRplay RSPdx
Chiavetta RTL2838

NRD-93 | JRC

For model NRD-93, JRC Japan Radio Co., Ltd.; Tokyo:
Bild von Wolfgang Bauer.
Paese:  Giappone
Produttore / Marca:  JRC Japan Radio Co., Ltd.; Tokyo
Anno: 1984 ?? Categoria: Ricevitore professionale (può includere bande amatoriali)
Semiconduttori (transistor solo contati) A semiconduttori.
Principio generale Supereterodina a doppia / tripla conversione
Gamme d'onda Onde medie (OM), lunghe (OL) e corte (OC).
Tensioni di funzionamento Alimentazione a corrente alternata (CA) / AC 100; 110; 115; 220; 230 / DC 24 Volt
Altoparlante - Questo apparecchio richiede altoparlante/i esterno/i.
Potenza d'uscita Modello: NRD-93 - JRC Japan Radio Co., Ltd.;
Materiali Mobile di metallo
Forma Rack
Dimensioni (LxAxP) 480 x 149 x 294 mm / 18.9 x 5.9 x 11.6 inch

NDH-93 | JRC

EKD 500 | RFT

In the late seventies, RFT brought out their EKD 100, a communications receiver with decadic knobs tuning and in 1980/81 their EKD 300 with digital frequency display and a conventional tuning knob as well as direct frequency entry by means of a keypad. These receivers found common use in military and official services in East Germany and other eastern European countries and they have been replaced by the EKD 500, a receiver which added memories and scanning functions, in 1986. Thia radio can be remotely controlled or can control another receiver in the master - slave mode.
It's successor, the EKD 700, saw only a small protoype / early production run before RFT Koepenick closed down as a sequel to the merger of both German states.
EKD 511 Basic receiver EKD 501, 14 kHz - 30 MHz; Filter 1st I.F. -3 dB +/- 5 kHz, SSB I.F. filter +/- 0,25 - 3 kHz
EKD 512 Basic receiver EKD 502, 14 kHz - 30 MHz; Filter 1st I.F. -3 dB +/- 8 kHz; SSB I.F. filter +/- 0,25 - 6 kHz
EKD 514 Basic receiver, 10 kHz - 30 MHz; Filter 1st I.F. -3 dB +/- 5 kHz; SSB I.F. filter +/- 0,25 - 3 kHz
EKD 515 Basic receiver, 10kHz - 30 MHz; Filter 1st I.F. -3 dB +/- 8 kHz; SSB I.F. filter +/- 0,25 - 6 kHz

Double conversion, I.F. 70,2 MHz, 200 kHz Digital display , accuracy 10 Hz
Sensitivity at 5 MHz AM, SSB < 0,5 uV Selectivity -6 dB
150 Hz, 400 Hz, 750Hz, 1,75 kHz, 3,1 kHz, 6 kHz,
+/- 0,25 - 6 kHz SSB
RF gain, 99 memories, scanning modes, computer remote control optional, master / slave operation as standard
The EKD - 500 comes with a rugged metal cabinet with the dimensions 54 x 19,8 (feet included) x 39,5 cm, the chassis can be pulled out of the cabinet after the four screws marked with a red coloured ring are unscrewed. The receiver has a weight of 25 kg. It can be powered by 127 or 220 Volts mains or from a vehicle battery or emergency battery in case of mains failure.
In the left upper corner, next to the protective / carrying handles, You find the grill of the small monitor speaker and below two multipole connectors to feed the audio signal to headphones or a tape recorder. A rotary control just below the monitor speaker selects the audio signal, in ISB mode (independent sideband), You can feed both sideband audio channels (channel A, USB / channel B, LSB) to the monitor speaker or in external speaker, for normal operation with the monitor speaker, the switch should be set to position 4. Just below, You find the volume / A.F. gain control and at it's right the R.F. gain control. The rotary knob marked A1 is the BFO note control.
The ten digit yellow - green LED display is the main information display of the receiver - the EKD 500 has only very few analog rotary controls to adjust volume and R.F. gain.
A flashing LED EXT indicates that the EKD 500 is in slave mode waiting for external operation commands, it is constantly on when the radio is remotely controlled.
he first two digits of the LED display gives the information about the acive receiving mode and the chosen I.F. bandwidth. A small table explains all different number codes. So "26" stands for AM reception with the 6 kHz I.F. filter and "43" for SSB reception (USB) with the 3 kHz i.f. filter. The letter "E" in the next segment indicates standard reception mode, the following seven digits indicate the reception frequency with a display resolution of 10 Hertz.
With the numbered keypad and the keys below the frequency display, You can directly enter an operation frequency, select the recepetion mode and the i.f. filter bandwidth and store and recall frequencies from the receiver's memory.
For direct frequency entry, for example to tune the set to the European standard frequency of Radio Austria, Vienna, on 6155 kHz, You have to press the buttons F (frequency entry) 6 1 5 5 . 0 0 or F 6 1 5 5 E (E = Empfang / reception) or F 6 1 5 5 >. To select the tuning steps, use the buttons dF (delta frequency) 0 . 5 0 to set the tuning steps to 500 Hz.
To selecto the reception mode, press the button MOD and the corresponding key You have looked up in the modes table, e.g. for AM mode (A3) use the key sequence MOD 2. Use the B button (stands for bandwidth) in the same way to select one of the i.f. bandwidths. The key GC (gain control) ist used to select fast and slow AGC control, manual r.f. gain control or the combined control, the combination SEL O turns off the electronic tracking preselector, with SEL 1, the electronic preselection is active so that only a small portion of the complete antenna signal is fed to the first mixer.
You can store up to 99 frequencies / reception modes / fiolter settings to the 99 memory channels of the EKD 500. The keystrokes STO 5 E or STO 5 > will store the active frequency and receiver settings into memory channel 5, with CALL 5 >, the content is recalled from the memory the the receiver's frequency display and with the key E (Empfang = reception), the EKD 500 is switched to the frequency indicated on the display, so You can check the memory's content before tunign the receiver to the new memory channel. With the keys CALL98 and CALL99, You can set the receiver to a priority channel and the maritime emergency frequency. SCAN activates different scanning modes, the start frequency has to be stored on memory channel 96 and the end frequency on memory channel 97. EXT activates the slave mode when the EKD 500 is to be remotely controlled from another EKD 500 receiver, when You press the keys EXT and EXT-FKT at the same time, the receiver will be switched backto normal operation.
You can not only use the frequency keypad to enter a reception frequency, You can also use the conventional tuning knob. The tuning steps can be programmed as I have written in the description above, the main tuning knob itself is quite a small plastic knob.
Just above the tuning knob, You find a rotary control to select the function of the row of LEDs. It can be set to act as a signal strength meter (one LED step stands for 10 dB), as A.F. level indicator and as tuning aid for radioteletype reception. Another LED indicates the lock of the carrier synchronisation when in automatic ECSS mode.
The EKD 500 as a professional communications receiver is intended for remote control. It can be controlled as a slave receiver from another EKD 500 or from a personal computer over a modem an telephone line. Via remote control, the memory content can be altered and memory contents can be copied from one receiver to another, You find a description of all these possibilities in the user's manual.
The receiver features an automated self test, press the EXT and EXT-FCT keys for a self test, the receiver will display AA and after You release the keys AO to indicate everything is fine, in case You get errors, You can do further tests to locate the error.
The R.F. signal first has to pass a protective bulb (it will blast with voltages higher then 30 V EMK to protect the receiver's front end), after that, it will pass an array of electronically switched suboctave band filters. These can be inactivated when the receiver is in scanning mode. After having been mixed with the oscillator signal of 70,21400 - 100,19999 MHz (the receiver is tuned in 10 Hz increments), the first intermediate frequency of 70,2 MHz is generated. After an amplifier stage, the i.f. will have to pass a monolithic +/- 3 or 5 kHz crystal filter. After having been mixed to the second I.F. of 200 kHz, the signal has to bass the high quality mechanical I.F. filters. For AM, diode demodulation and for single sideband reception, a product demodulator is used. The EKD 500 gives You the option of automatic ECSS reception: the receivers internally generated carrier is synchronised with a poor carrier rest of the station's signal and locks automatically on the correct frequency. The EKD 500 is also fully ISB capable, this will say, it can receive transmissions with two different sideband informations on the upper and lower sideband and will feed the audio channels A and B to the audio sockes or the monitor speaker. The receiver also has demodulators for F1 / radioteletype modes.
In practical use, the EKD 500 is very convincing with it's very high sensitivity, excellent dynamic range due to the electronic preselection with suboctave filters and high stability. The sound from the internal monitor speaker is not perfect, so an external speaker, maybe in combination with an audio equalizer or an external A.F. notch filter might do a good job.
The operation scheme with the different number / letter combinations for the reception modes is a bit complicated. After You have learned to standard combinations, the receiver is extremely flexible and quick to work on.
The performance on the shortwave bands is excellent, for standard AM operation and even more in single sideband reception and exotic reception modes such as ISB and radioteletype operations. The small tuning steps and the high stability oscillators do a very good job.
The most impressive moments with my EKD 500 was the annual special transmission from Radio St. Helena: on my NRD-535, I could only identify some speech or music fragments, with the EKD 500, I could understand every word of the station identification and could even understand the content of the telephone calls transmitted over the airwaves.
weitere Lektüre:
d: Kurzwellenempfänger EKD 500 - eine preiswerte Alternative in der Spitzenklasse, Ch. Tholen, G. Wetzger, Radio hören 4/96
© Martin Bösch

EZ 100 | RFT


FDM-S1 è un ricevitore a conversione diretta (ADC 61.44MHz + FPGA) con estensione di frequenza 20kHz-30MHz.

Può essere usato come campionatore a 61.44MHz per usi in down-sampling fino alle VHF (200MHz).

Alimentato solo dalla USB ha un consumo inferiore a 2.2W.
Equipaggiato del software FDM-SW1 con il quale è possibile demodulare CW, LSB, USB, DSB, AM, SAM, DRM, FM e WFM.

Il decodificatore DRM è integrato, non ha bisogno di un software esterno.

Dimensioni compatte solo 90x108x27, è fornito con adattatore BNC, cavo USB, CD e custodia.


RSPdx / SDRplay

The SDRplay RSPdx is a single-tuner wideband full featured 14-bit SDR which covers the entire RF spectrum from 1kHz to 2GHz giving up to 10MHz of spectrum visibility. It contains three antenna ports, two of which use SMA connectors and operate across the full 1 kHz to 2 GHz range and the third uses a BNC connector which operates up to 200MHz.

The RSPdx is a replacement for the highly successful RSP2 and RSP2pro SDR receivers, which have been extensively redesigned to provide enhanced performance with additional and improved pre-selection filters, improved intermodulation performance, the addition of a user selectable DAB notch filter and more software selectable attenuation steps . The RSPdx , when used in conjunction with SDRplay’s own windows based SDRuno software, introduces a special HDR (High Dynamic Range) mode for reception within selected bands below 2MHz. HDR mode delivers improved intermodulation performance and fewer spurious responses for those challenging bands.


R-5000 | Kenwood

Ricevitore HF desktop a tripla conversione in configurazione analogica, opera tra 0.1-30 MHz all-mode. Dispone di Notch BF e di IF-shift. Anno di introduzione 1986, paese di ideazione Giappone.
Specifiche tecniche :

Frequenze 0.1000 ~ 30.0000 MHz
108.0000 ~ 174.0000 MHz [1]
Modi operativi CW / RTTY / LSB / USB / AM / FM
Passo di sintonia 10 / 100 Hz 1 / 2.5 / 5 KHz
1 MHz
Sensibilità SSB / CW 2.5 uV (0.1~0.15 MHz, 10dB S+N/N)
1.0 uV (0.15~0.5 MHz, 10dB S+N/N)
4.0 uV (0.5~1.8 MHz, 10dB S+N/N)
0.25 uV (1.8~30 MHz, 10dB S+N/N)
0.5 uV (108~123 MHz, 10dB S+N/N)
0.25 uV (123~174 MHz, 10dB S+N/N)
RTTY 2.5 uV (0.1~0.15 MHz, 10dB S+N/N)
1.0 uV (0.15~0.5 MHz, 10dB S+N/N)
4.0 uV (0.5~1.8 MHz, 10dB S+N/N)
0.25 uV (1.8~30 MHz, 10dB S+N/N)
0.5 uV (108~123 MHz, 10dB S+N/N)
0.25 uV (123~174 MHz, 10dB S+N/N)
AM 25 uV (0.1~0.15 MHz, 10dB S+N/N)
10 uV (0.15~0.5 MHz, 10dB S+N/N)
32 uV (0.5~1.8 MHz, 10dB S+N/N)
2 uV (1.8~30 MHz, 10dB S+N/N)
4 uV (108~123 MHz, 10dB S+N/N)
2 uV (123~174 MHz, 10dB S+N/N)
FM 0.5 uV (1.8~30 MHz, 12dB SINAD)
1.0 uV (108~123 MHz, 12dB SINAD)
0.5 uV (123~174 MHz, 12dB SINAD)
Selettività SSB 2.4 KHz (-6dB)
4.4 KHz (-60dB)
AM 6.0 KHz (-6dB)
20 KHz (-50dB)
FM 12 KHz (-6dB)
25 KHz (-50dB)
Attenuatore RF 10, 20, 30 dB
Reiezione ultima filtri 80 dB [2]
Dinamica 102 dB (14 MHz, segnali spaziati di 50 KHz)
86 dB (segnali spaziati di 20 KHz) [2]
65 dB (segnali spaziati di 5 KHz) [2]
Blocking 134 dB (segnale spaziati di 100 KHz) [2]
IP3 +15 dBm (14 MHz)
Reiezioni immagini > 60dB (0.1~1.8 MHz)
> 80dB (1.8~30 MHz)
Reiezioni media frequenza > 60dB (0.1~1.8 MHz)
> 70dB (1.8~30 MHz)
AGC Veloce, lento
Stabilità in frequenza ± 10ppm max con temperatura da -10°C a +50°C
Media frequenza 58.1125 MHz
8.83 MHz
455.0 KHz (solo FM)
Memorie 100 locazioni generali divise in 10 banchi
Display 10 Hz di risoluzione in frequenza
Antenna 50Ω su SO239
500Ω su morsetto (0.1~1.8 MHz)
Alimentazione 13.8VDC esterna [3]
120~240 VAC
Consumi 40 W (VAC)
2 A (VDC)
Livello audio 1.5 W su carico di 8Ω
Uscita audio Jack 6.35 mm cuffia
Jack 3.5 mm audio
Jack altoparlante esterno
Connessioni DIN RS232C computer
DIN espansioni
Temperatura operativa da -10°C a +50°C
Dimensioni 270 (L) x 96 (A) x 270 (P) mm
Peso 5.6kg
[1] Con il modulo convertitore opzionale VC-20
[2] Questo parametro, non nei dati ufficiali, è stato ricavato con test diretti
[3] Con il kit opzionale DCK-2
Descrizione :

Il Kenwood R5000 è un ricevitore che implementa una configurazione a tripla conversione di frequenza per la banda 0.1~30 MHz e tutti i modi operativi, l'apparato può inoltre tramite l'installazione di un modulo opzionale coprire anche una porzione delle VHF. Il front-end esprime un buon comportamento dinamico con una IP3 di +15 dBm mentre una serie di filtri di preselezione ad ottava minimizzano le distorsioni di secondo ordine. L'R-5000 integra tutte le funzioni richieste per l'ascolto HF, tra queste: doppio VFO, PBS (pass band shift) per spostare la finestra di media frequenza di ±0.9 KHz per i modi CW/RTTY/SSB, doppio noise-blanker con distinti tempi di blanking e con regolazione del livello di intervento, filtro notch a livello audio tra 500~2600 Hz con attenuazione minima di 25 dB per SSB/RTTY/AM - questo filtro diviene passa banda (APF) per il modo CW, costante di tempo AGC selezionabile tra lenta o veloce, regolazione continua del guadagno nella IF, squelch, attenuatore RF a passi di 10 dB, doppio orologio per fusi orari diversi, timer on/off. L'impostazione della sintonia può essere eseguita tramite comando rotativo, con immissione dalla tastiera, od ancora su gestione remota da PC. Sintetizzatore vocale opzionale VS-1 per l'annuncio della frequenza. Vi sono 100 locazioni di memoria divise in gruppi di 10 cui associare oltre la frequenza e modo anche l'ingresso antenna (bassa od alta impedenza). Opzioni di ricerca tra canali in memoria e tra limiti di frequenze, per quest'ultima vengono utilizzate le locazioni 8 e 9 come estremi della banda. Connessione mute per l'abbinamento dell'R-5000 ad un ricetrasmettitore. Dimmer per regolare la luminosità del display.

Nell'R-5000 vi sono quattro posizioni per l'installazione dei filtri a livello della 2° media frequenza. Alcuni filtri sono di serie ed altri opzionali, le caratteristiche dei dispositivi compatibili sono come da tabella.

Filtro Modo primario IF Selettività
YK-88CN CW 8.83 MHz 0.27 KHz (-6dB)
1.10 KHz (-60dB)
YK-88C CW 8.83 MHz 0.5 KHz (-6dB)
1.5 KHz (-60dB)
YK-88SN SSB 8.83 MHz 1.8 KHz (-6dB)
3.3 KHz (-60dB)
YK-88A-1 AM 8.83 MHz 6.0 KHz (-6dB)
11.0 KHz (-60dB)

Oltre alla modalità automatica, che associa ogni filtro ad un dato modo, l'utilizzatore con l'eccezione della FM può selezionare la selettività agendo sull'apposito commutatore rotativo posto sul frontale.
Prestazioni e note d'uso :

Questo ricevitore della Kenwood ha raggiunto una ampia diffusione per merito delle buone caratteristiche e della combinazione di funzioni di cui è dotato, nel periodo che ha visto la sua introduzione era il competitor che primeggiava testa a testa con un altro apparato di pregio, l'IC-R71E della Icom. Per anni gli appassionati di ricezioni broadcast ed utility su HF hanno diviso le proprie preferenze tra questi due modelli. Nel concreto il Kenwood R5000 ha tra i punti di forza un buon campo dinamico libero da intermodulazioni ed un'ottima selettività per i modi SSB ed AM, questo grazie anche ai filtri IF opzionali che è possibile installare e caratterizzati da un fattore di forma inferiore a 2:1 ponendosi in tal modo su livelli di primo piano nel quadro della tecnologia costruttiva. Non soddisfacente è invece l'eccessiva desensibilizzazione del front-end per la banda delle onde medie, in effetti la sensibilità certo adeguata sulle HF di 1.8~30 MHz pone vincoli quando si utilizza l'apparato su frequenze inferiori. Un ricevitore dunque inadatto al MW-DX. Dal lato operativo la funzione IF-shift per quanto utile non consente il deciso intervento che sarebbe auspicabile.

SR-16HN | Supertech

Supertech: PLL World Band Receiver SR-16HN, Supertech Deutschland GmbH; Nettetal
Paese:  Germania
Produttore / Marca:  Supertech Deutschland GmbH; Nettetal
Anno: 1988 ?? Categoria: Radio (o sintonizzatore del dopoguerra WW2)
Semiconduttori (transistor solo contati) A semiconduttori.
Principio generale Supereterodina (in generale)
Gamme d'onda Onde medie (OM), lunghe (OL), corte (OC) e MF (FM).
Tensioni di funzionamento Batterie a secco / 6 x 1,5 Volt
Altoparlante AP magnetodinamico (magnete permanente e bobina mobile) / Ø 10 cm = 3.9 inch
Potenza d'uscita 1 W (qualità ignota) Modello: PLL World Band Receiver SR-16HN - Supertech Deutschland GmbH;
Materiali Plastica (non bachelite o catalina)
Forma Apparecchio portatile > 20 cm (senza la necessità di una rete)
Dimensioni (LxAxP) 305 x 160 x 62 mm / 12 x 6.3 x 2.4 inch
Annotazioni PLL (FM-Stereo)- Synthesized World Band Receiver mit Timer/sleep Funktion,
  • Frequenzbereiche
    • FM 76..108 MHz
    • AM 150..29999 kHz
    • LW 150..281 kHz
    • MW 520..1620 kHz
    • SW 11 m..120 m
  • Antenne int./ext. umschaltbar
    • 7- tlg. Teleskopantenne (140 cm)
    • Ferritantenne 13 cm
  • Tonbandanschluß über DIN 5 pol Buchse
  • Kopfhöreranschluß über Klinkenbuchse (3,5 mm)
  • Betrieb mit ext. Netzteil (DC 9 Volt/400 mA)
  • Zur Erhaltung der Speicherfunktionen sind zusätzlich 2 Batterien erforderlich (1,5 Volt-Computer Back-up)
  • Display beleuchtbar
  • wahlweise Verwendung mit Aufstellbügel oder Tragegriff, FTZ No. 11/605.
Auch bekannt/vertrieben als Sangean ATS-803A und Siemens RK651
Peso netto 1.4 kg / 3 lb 1.3 oz (3.084 lb)


T2FD (Terminated Folded Dipole) mounted inverted vee 14.5 m (self-built)
Delta-Ewe from 48 meters (self-built)
Vertical by 5.2 m. DIAMOND X510HDN
Loop amplified m.1,10 (self-built)
Vertical 12.5 m. self-built, with balun 40: 1 at the bas
Mini Wipe 10m. self-built.

Mini-Whipe; Maxi-Whipe - T2FD inverted vee - Delta-Ewe

Loop preamplificato

X510 Series Base Station Antenna Diamond X210HDM

Band: 2m/70cm
Element Phasing: 3-5/8l/8-5/8l
Gain (dB): 8.3/11.7
Watts: 330 (2m) / 250 (70cm)
Connector: Type-N
Weight: 5 lbs.
Length: 17.2'
Max Wind Resistance: 90 MPH


MFJ-959B Preselettore - preamplificatore
XPhase riduttore interferenze
Preselettore autocostruito

MFJ-959B Receiver Antenna Tuner / Preamplifier SWL Listener RX Only Dual-Antenna


XPhase, QRM Eliminator, QKiller


Preamplier proiect W7IUV (self-made)

antenna pre-amplifier Delta-Ewe +20 dB
internal preamplifier +20 dB, for other antennas




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