Форум Радиолюбителей КВ - УКВ

IK2LRN

Hi my SAW filter for 2M Transverter is defected. Cover 145-147 instead of 144-146. I ask if someone have one for sale or let me know when i can purchase it.
Regards
Luca IK2LRN

IK2LRN

Hy Yury, regarding 2m trasnverter i have investigate about the problem on mixer M1. Referring with rear of PCB in a previous post you told me that to apply only cf1 and cf2 with value 100nF. The the points highlighted with an arrow are connected to ground than the input and output filter is ...

IK2LRN

Hi Yuri, i have a question related the FAN control. When the Avelina start correctly the ultra low noise Notchua 12VDC FAN start with enough speed, with supplied voltage 9,9VDC , at J15. The Value of the voltage at MJD122-1G Q7 , refer to ground, are the following: collector 13,7V base 7,86V emitter ...

IK2LRN

Hi Yuri, i have completed the enclosure cabling except for the Transverter since i have not yet tested it. You can see the results in the attached picture I have found two minor problems: 1) Fan voltage remain fixed at 8,2V even if i turn the trimmer 2) When i turn on the radio for the first two ...

IK2LRN

Dear Yury, i have rebuild the final transfomer and replace c200, C198, C199, C201, C202 and 50Mhz low pass filter capacitors with ATC100 capacitor. There is a supplied of that capacitor directly in my city. The output power is increaed form 35 to 43W at 50MHz Than i have replaced C201 first from 100 ...

IK2LRN

Hi Yury, i have removed all the capacitors but it seams that above 45Mhz there is an impedance mismatch. I have connected spectrum analyzer at the output of the final transformer, with mosfet bias off. If i disconnect the transformer the low pass filter is ok but if i connect the trasformer the ...

IK2LRN

Hi Yury, i have removed C198 and C200 without replacing it. Power output is still about 35W. I have verified that avelina output is about 1W Like i have explained in my previous post signal level at mosfet gate is allmost the same at all band , including 50Mhz. Than i suppose that up to the mosfet ...

IK2LRN

Hi Yury, now i have more than 100W in all bands except to 6m: the output power is only 35W with power consumption about 5A At 6m with my previous amplifier i have obtained 80w. I have double checked the output filter with spectrum analyzed and it is OK. Also the RF level at the mosfet gate is about ...

IK2LRN

Hello Yury thanks for your reply. I have solved the Mosfet polarization problem. R47/48 that was 1kohm : the value indicated in the schematic, whereas R60/61 was set at 33kom as BOM instead of 3kohm. My original Mitsubishi mosfet than has been burned! The gate resistance of burned mosfet is 500ohm ...

IK2LRN

Dear Yury, last year i have souccessfully implemented your Amplifier old version. Now i have completed the Rev 3.6.0. I have already tested all the filters with spectrum anayzer. Amplifier has been now installed in the enclosure. For the components i have follow your BOM 3.6.1 2022-05-04. I have ...

IK2LRN

OK Yury, now I think that it is clear the flat cable connection.

Regarding the front panel i do not understand the function of the "REMOTE" 3.5mm plug.

Thanks, 73

Luca IK2LRN

IK2LRN

Hi Yury, thanks for your very useful answers. I have a question related the digital input-output cabling. If i have understood well : 1) rear RS232 connector OC OUTPUTS should be connected to J16 PIN 17-24 2) rear PTT-IN should be connected to J16 pin 1 3) rear PTT should be connected to J16 pin 25 ...

IK2LRN

Hi Yury, it is necessary to make a M3 threaded hole in the shelf for install the heasink for Transverter and Avelina small transistors ? Can you please show me how do you have intall it ?
Thanks,
73
Luca IK2LRN
Milano Italia

IK2LRN

Hi, attached the pictures of my work in progress.
I am currently studying the mechanical constraints.
73
Luca

IK2LRN

Hi Yuri for the fan do you suggest to use simple 2-3 wire fan or 4wire speed control PWM fan ? https://www.aliexpress.com/i/4000603214374.html. I could measure heatsink temperature for drive the fan. I don't know if pwm could generate interference. I suppose that the 2 fan configuration will be push ...

IK2LRN

OK Yuri,
In have experimented that Avelina take the power, from Amp,through Alex connector. It is normal ?
How to simply avoid it ?
Luca

IK2LRN

Hi Yuri. thanks for your very useful informations !
I have a question relating the 12VDC power switch in enclosure front panel : how i can manage 10A using a small push button ?
Maybe a Latching relay ?
I have something missed in the Amp schematic ?

73

Luca IK2LRN

IK2LRN

Hi Yuri, i am begining to study the beautiful Avelina encloure before to start to install the boards. I have some questions regarding it: 1) Spacers height for PCBs 2) How to install the Amplifier heatsink spacers that i have received with the enclosure. In particular regarding the smallest. Please ...

IK2LRN

Hi, thanks for your reply.
Visaton speakers has 40mm deep. There are some mechanical constraints in terms of deep ?
Luca IK2LRN

IK2LRN

HI, I WOULD LIKE TO KNOW WHERE I CAN PURCHASE GOOD QUALITY SPEAKERS THAT FITS WITH THE ENCLOSURE.
Visaton SL 87 ND - 8 Ohm is suitable for that purpose ?
THANKS, 73
LUCA IK2LRN
ITALIA

IK2LRN

Yes, i have replied.

IK2LRN

Hi , the bootloader app establish the connections but the download fails since the FPGA refuse to boot.
Thanks,
73
Luca IK2LRN

IK2LRN

Hi Yuri,
i would like to know if it is foreseen an further evolution of the SDR Avelina.

Luca

IK2LRN

@ YL2GVC where i must measure the oscillator signal level ? The lan led blink
@ Yuri i will verify in details the lan chipset parameters and i will report the details.

Thanks
Luca IK2LRN
Italia

IK2LRN

Hi Yuri, yesterday i have successfully implemented my second working Avelina III. I am very happy about that. Now i i would like to understand why my does not work my others two boards: Avelina II and Avelina III Both boards have the same bahaviour: with and without bootloder mode led D15 remain on ...

IK2LRN

Hy Yuri ! i have purchased the FPGA at Aliexpress ,for a completely new Avelina IIi board ,for 300 euro. It seams that currently the prices are dropping. What seller do you suggest ? I have already seen your well done video but I didn't see the target temperature for the bottom and top PCB. I can ...

IK2LRN

Hi Yury, I have implemented 3 Avelina boards. Unfortunately only one works perfectly. The others two refused to boot: i don't know why ! I intend to replace the FPGA for try to solve the issue. I would like to know how to desolder the FPGA without damage the other surrounding and downstairs ...

IK2LRN

I have just ordered RD70HUF2. Please let me know the bias required.
73 Thanks
Luca IK2LRN

IK2LRN

Hello Yuri,
which is the best transistor for this Transverter ?
73
Luca

IK2LRN

Ok, Thanks.
Luca

IK2LRN

Hi Yuri, i am currntly building also your 2m Transverter. With reference to attached picture i didn't found the following informations, at schematics and BOM: 1) L21,L22,L23,L9,L12 : wire and coil diameters, coil lenght (turns spacing) 2) Front Side: C* capacitors 3) Rear Side c, cf1,cb1,cb2,cb3,cb4 ...

IK2LRN

Thanks for your reply.
If i use the the 0.3w output sma i need to modify the attenuator?
Luca

IK2LRN

Hi Yuri, i intend to use it with my homebuilt Hermes Board. How do you have pick-up the signal from the board ? Do you have applied ufl connectors? If i pick up the signal from the board tx output sma how i need to change the attenuator ? It is expected performance degradation if you use the tx ...

IK2LRN

Hi Yuri, i have allmost finished your SDR Driver. Please refer with attached picture. I would like to know how do you suggest to proceed to adjust mosfet bias and the bias vaules [mA]. Like your schematic i have used the filter RLP40. Why you do not have used RLP50 for cover also 6m band ? Thanks ...

IK2LRN

Hi Yuri, which is the best companion antenna tuner solution for your 100W amplifier?
Do you have think about integrate ATU in your enclosure?
I have already ordered your new enclosure, It should arrive in soon.
I have an antenna wire dipole than antenna tuner is absolutely required.

73

Luca IK2LRN

IK2LRN

Hi Yury,in order to update to 3.6.1 i have replaced 1) allmost all the LPF capacitors 2) R36 1.2K 3) R56-59 22ohm 4) R60-61 33K 5) add 2x22k at D51 (see picture).
If you remmember others variations please let me know.
Thanks, 73
Luca IK2LRN

IK2LRN

Hi Yury,
thanks for the detailed information.
In order to avoid confusion i ask if you can please provide the updated schematics.
For the implementation i have used as reference
the values indicated in 3.6.0 schematics.
I have not used bom
73
Luca IK2LRN

IK2LRN

Hi Yury, in the new Amplifier version 3.6 there are some capacitors and resistors with the indication R* and C*. Please refer with the red circles in the attached picture. Please let me know what does it mean.
73
Luca

IK2LRN

Hi Yury,
at 6m maximum power is about 80w
I am currently start to build your new 3.6 version.
73
Luca

IK2LRN

Hi All,
i have successfully implemented Avelina SDR III with its 100W Amplifier.
73
Luca IK2LRN
Italy

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