Posts by iw5bsf

ok thank

Roberto iw5bsf

Hi I have to calibrate a helical illuminator with my nano vna v2 I think it's one of the first versions I wanted to update the firmware but from the official website I can't understand which one is the right one
downloaded the version nanovna-v2-20201013-v2_2. firmware
and firmware version NanoVNA2-20200328
I don't know which one is right?
73 by iw5bsf Roberto

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

Quote from iw5bsf

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

https://groups.io/g/UKMicrowav…y,,12f675,20,2,0,27514927

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

Quote from SV1BDS

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