Трансивер Raisin DX2
Re: Трансивер Raisin DX2
Да, можно. Тут есть считалка http://www.toroids.info/FT37-43.php. Количество витковы выбираем таким чтобы на самой низкой рабочей частоте трансформатора сопротивление обмотки было в 8-10 раз больше сопротивление источника/нагрузки. Для трансофв в смесителе 10-12 витков достаточно. Для трасов в ПЧ можно и меньше в два раза
Re: Трансивер Raisin DX2
Андрей здравствуйте, С наступившим Новым Годом Вас!
Ранее в теме вы писали что если заменить FSA на 74lvc в миксере то немного потеряем в динамике. А сильно ли возрастут потери если 74lvc применить в коммутации ДПФ данного трансивера?
Ранее в теме вы писали что если заменить FSA на 74lvc в миксере то немного потеряем в динамике. А сильно ли возрастут потери если 74lvc применить в коммутации ДПФ данного трансивера?
Re: Трансивер Raisin DX2
Потери у FST3157 и 74LVC1G3157 одинаковые
Re: Трансивер Raisin DX2
Dear,
i'am interested to try your schematic rtx raisin dx2 ...
i have 2 question :
What is the gain of if 9mhz ?
the filter quartz is n°2 ...one for rx and one for tx ? or both serially ? i not shure...
many thanks for your reply.
73
Ik6hpb
Italy
i'am interested to try your schematic rtx raisin dx2 ...
i have 2 question :
What is the gain of if 9mhz ?
the filter quartz is n°2 ...one for rx and one for tx ? or both serially ? i not shure...
many thanks for your reply.
73
Ik6hpb
Italy
Re: Трансивер Raisin DX2
Gain from input to point F is 40dB
Both filters used in RX and TX.
This transceiver is quite difficult to repeat and requires not only knowledge of circuitry, but also the availability of measuring equipment for tuning - signal generator, oscilloscope, NWT. Perhaps you should pay attention to simpler constructions, for example Raisin
Re: Трансивер Raisin DX2
Thanks for your reply ,
i have instruments for testing the circuits :
Vna dg8saq, analyzer hp8563e, digital oscilloscope 100mhz .
I built :
cdg2000 in the year 2001/ 2008
https://ik6hpb.jimdofree.com/
rtx 144mhz design dl7qy dubus 1985/1986 /ub7kpv vfo si570 / if 21.4mhz hycas w7zoi ; but I don't like the if 21.4 mhz
https://www.youtube.com/watch?v=pslCRvuwCrs
sdr r3di malamute
**** I would like to change the your 2 filters with 2 my filter xf9b kvg load 500ohm 30pf ...
can you tell me what impedance I have to adapt for my kvg filters?
73
ik6hpb
i have instruments for testing the circuits :
Vna dg8saq, analyzer hp8563e, digital oscilloscope 100mhz .
I built :
cdg2000 in the year 2001/ 2008
https://ik6hpb.jimdofree.com/
rtx 144mhz design dl7qy dubus 1985/1986 /ub7kpv vfo si570 / if 21.4mhz hycas w7zoi ; but I don't like the if 21.4 mhz
https://www.youtube.com/watch?v=pslCRvuwCrs
sdr r3di malamute
**** I would like to change the your 2 filters with 2 my filter xf9b kvg load 500ohm 30pf ...
can you tell me what impedance I have to adapt for my kvg filters?
73
ik6hpb
Re: Трансивер Raisin DX2
In Raisin DX2 used QER filters with impedance ~300ohm. In case of usage XF with impedance 500jhm you need change R42 to 470ohm, T2T3T4 should be wound in three wires (i.e. contain three windings) which are connected to provide a resistance transformation of 1:9 (common gate J310 IF amplifier have input impedance around 60-70ohm)
Re: Трансивер Raisin DX2
What is the ferrite k7 u 2000 ?
I have ft37-43...
ft23-77
bn43-2402...
is the same ?
ik6hpb
I have ft37-43...
ft23-77
bn43-2402...
is the same ?
ik6hpb
Last edited by ik6hpb on 19 Jan 2023, 00:47, edited 1 time in total.
Re: Трансивер Raisin DX2
more questions:
have you had time to check the dynamics of the agc ?
can you tell me what level in dbm you have at the output of the tx before the mixer ( 9mhz ) ?
many thanks
ik6hpb
have you had time to check the dynamics of the agc ?
can you tell me what level in dbm you have at the output of the tx before the mixer ( 9mhz ) ?
many thanks
ik6hpb