Die Suche ergab 307 Treffer
- 09 Dez 2018, 17:07
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Morning Wout, rebuilding work is going on, so I don't have the possibility to answer in short notice. The faktor 2,22 is dependent on current. In half wave rectification, you have without load current a DC voltage of AC-Voltage * SQRT(2). With full load current it is AC-Voltage * 0,45. The number 0...
- 09 Dez 2018, 17:07
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Martin hat geschrieben: that`s great
we have to compare if the PSU is identical to your radio,
there are versions: EK07, EK07D and EK07D2
greetings
Martin
- 09 Dez 2018, 17:06
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Wout hat geschrieben: Hello again Martin and Wolfgang,
I got a complete PSU offered this evening.
Pictures and other details are still to be send to me, I will keep you informed!
Kind Regards,
Wout
- 09 Dez 2018, 17:06
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Wout hat geschrieben: Good evening Martin & Wolfgang!
Wolfgang, apart from the other calculation model you are stating, where is the 2,22 coming from?
Wout
- 09 Dez 2018, 17:06
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Martin, I agree, but it's simple math. Step by step: 1. Required DC 150 V stabilised with 150C2. Rectification half wave by simple diode Formula for stabilisers: Rv = (Ub-Uv)/(Iv+Ir) or transposed Ub= (Rv*(iv+Ir))+Uv Rv = Shunt Ub = Input voltage Uv = stabilised voltage Iv = required current Ir = n...
- 09 Dez 2018, 17:05
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Martin hat geschrieben: I will get the radio and put it on the table.
Wolfgang, I am pretty shure an EK07 will not use 466Volt anywhere.
greets
Martin
- 09 Dez 2018, 17:05
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Good afternoon, I did some collection of information from the schematics and did some calculation. The transformer has the windings: Anschluss Wicklung Seite Spannung Strom/comment 1 – 6 W 1 Primär 220 V 7, 8 W 2 Sekundär 5,8 V 3 Skalenlampen 9, 10 W 3 Sekundär 24 V Gleichsp 80 mA 11, 12 W 4 Sekund...
- 09 Dez 2018, 17:05
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Hello Wolfgang, Thank you very much for double checking in the manual. I have a rather hefty low-voltage transformer and a variable auto-transformer here and when I am receiving the PSU connector in the mail I will start measuring the filament currents. Keep you all posted, Greetings from Holland, ...
- 09 Dez 2018, 17:04
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Good morning Wout, I doublechecked my documentation, as you already stated, the is no information about detailed data of the transformer, just DC voltages and currents an some AC voltages without currents. That leaves you with 3 options: 1. Measuring or calculating of the needed voltages and curren...
- 09 Dez 2018, 17:04
- Forum: FUNK und RADIO
- Thema: Rohde&Schwarz, EK07D Restauration
- Antworten: 101
- Zugriffe: 103927
Re: Rohde&Schwarz, EK07D Restauration
Wout hat geschrieben: Hello Jens,
You are probably very right. This is why I am carefully considering what to do.... a new transformer... or build something with multiple, less costly standard transformers. Obtaining a defunct EK07 seems also not that easy. Let's see, I still need to make up my mind.
Kindest,
Wout