Hi George I am testing an rx converter for 2.3 GHz I do not remember how to measure the gain I set this way spectrum analyzer reference -30 dbm I have an input protection attenuator of 20 db if 144 nhz then I send -40 dbm from the generator rf 2.3 GHZ at the input of the converter and I read -30 on the spectrum of the analyzer
Thank Roberto iw5bsf
hello George my test pipe cap 2.3 GHz report 2.2 - 2.5 db
73 Roberto
thanks band italy 2320 ghz ok
Roberto
thank George , if I don't correct the height 24 mm? good idea now i have to see if i can find them in the plumbing sho
73 Roberto
I took the copper caps like yours I have to make the center hole, did you measure the loss of 2.3ghz?
thank you
Roberto
ok sorry if i wrote sho instead of shop, thanks i want to experiment try building a pcb and two sma connectors test a 2.3ghz tube cap filter like you did
73 Roberto
thank George , if I don't correct the height 24 mm? good idea now i have to see if i can find them in the plumbing sho
73 Roberto
Hello George
i am building a 2.3 Ghz transverter designed by w1ghz Paul i saw that you did it too for the PIPE CAP you used the dimensions mm?
thank you
73 de iw5bsf Roberto
hello
I found this information interesting
on pic 12f675
I took a look after reading your directions datasheet 4351 page 22 it says register 3 also serves to determine TIMER AND FAST LOCK REGISTER SEQUENCES TER
Thanks for the answer, I use the pickt3 as a programmer following some indications on the net I put a resistor between VDD and MCLR for programming
the sequences in the asm file up to these:
EEPROM LOCATION
DE 0x00, 0x7D, 0x80, 0x10 ; register R0 2514,000Mhz // ok
DE 0x08, 0x00, 0x80, 0x29 ; register R1
DE 0x00, 0x00, 0x4E, 0x42 ; register R2
DE 0x00, 0x00, 0x04, 0xB3 ; register R3
DE 0x00, 0x85, 0x00, 0x3C ; register R4
DE 0x00, 0x58, 0x00, 0x05 ; register R5
therefore the sequences must be reversed
12f675 pic
I noticed that touching the pin mclr pic 12675 with the finger of the hand restarts the lock
hello not lock only if I first turn on 10 mhz connected then of lock I had tried with attiny 13 usual problem
hello help pll ADF4351 PIC12F675
i made the converter 433 mhz / 10489 for qo-100 as LO I use pll ad4351 with controller pic12f675 i as a reference I use external 10 mhz of the isotemp 131-100 it is very good problem that if I turn on the pll the lock does not turn on if I turn off then I turn on first the external reference 10mhz and then I turn on the pll so does any idea work?
i used this project;
http://www.f5ubz.fr/adf4351/ADF4351_F5UBZ.html
thank
73 de iw5bsf Roberto
hello George
looking on the internet I found this nxp module could it work at 2.4ghz? I attach date shhet it seems to me twin mhl21336
73 de iw5bsf Roberto
yes I confirm that I have noticed the distortion of the transponder
73 de iw5bsf Roberto
Hello
I made the IF0 RT0 10 GHz a few years ago (designed by s53mv) I modified the original 27 MHz vxo oscillator to receive QO-100 the tested with excellent results it seems NF is around 0.7 db beacon 10489
I listen to the beacon very well the stability of the quartz very good unfortunately the range and only a few khz I'm waiting for the crystall ordered to cover 500 khz of band
73 de iw5bsf Roberto
thank you good idea I do one in the next few days
i don't have vna but i can measure with hp bolometer and rf generator
73 Roberto
Hi Roberto, it seems that you have 21.87 dB coupling and 35.89 dB directivity that are good values. You can verify with AD8302 these values if you put in generator -10dBm. You can measure the ratio for coupling and directivity. Also you can repeat my fault measurement and then put attenuators to fix it. The coupling value means that you have the forward power 20 dB less and the directivity value that you can not measure less SWR than 35 dB i.e. about 1:1.1
Good morning George yesterday I remeasured the directional coupler 2.4 GHZ the only measures but with one hour of heating of the bolometer hp as the manual says good results 23 db of coupling and the directives 39 db what do you think
73 de iw5bsf Roberto
iw5bsf I have done something similar. You are right about the values. The critical is the ground paths of the two 56 ohm resistors. If they have inductance to the ground the actual attenuation will be smaller. To avoid high power passing I replaced variable R with a fixed one. Also use metal film or carbon for all as the usual resistors are inductive. I have also the W1GHZ 2.4 GHz transverter and begin assemby it for simplex usage.
Thank George, I put 560 hom fixed as indicated by the 5% tolerance of metal oxide that I tried before measuring the measured power ft87 on 27.7 dbm then inserted the attenuator (26.8 db considering the tolerance of the resistors) at the output = 0.90 is ok
73 de iw5bsf Roberto
here is the photo of my tx 2.4 and rx 739/436 mhz transverter
Roberto iw5bsf
