UR5FFR

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

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?

Потери у FST3157 и 74LVC1G3157 одинаковые

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

ik6hpb wrote: ↑18 Jan 2023, 21:45 What is the gain of if 9mhz ?

Gain from input to point F is 40dB

ik6hpb wrote: ↑18 Jan 2023, 21:45 the filter quartz is n°2 ...one for rx and one for tx ? or both serially ? i not shure...

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

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

ik6hpb wrote: ↑18 Jan 2023, 23:30 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?

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)

What is the ferrite k7 u 2000 ?
I have ft37-43...
ft23-77
bn43-2402...
is the same ?
ik6hpb

ik6hpb wrote: ↑19 Jan 2023, 00:31 What is the ferrite k7 u 2000 ?

K7 - small ring with diameter 7mm. 2000 is magnetic permeability.
You can use 43 or 73 material

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