Auxiliary equipment for various GHz measuring purposes
........and values i measured on my sample which is in stock :
=========== UP Down Converter 10GHz ==========
Auxiliary equipment for various 10,0.....13,0 GHz measuring purposes - Output power max. 1mW
This is an UP and DOWN mixer, meaning it can downmix 10GHz signals to for example 1GHz and UPmix 1GHz to 11GHz. Thus, the IF port output and input are the same as the RF port input and output.
PLL oscillator from: DF9NP https://www.df9np.de
Mixer : Hittite https://www.analog.com/media/en/technical-documentation/data-sheets/hmc220.pdf
====================== VNA ============================
2 Ports VNA KC901R
A very good measuring device for measurements up to almost 10 GHz. Despite the stated range
of 7 GHz , it actually works up to over 9.8 GHz with all its functions. In addition to the RF analyzer
and RF signal generator ( including an AF generator ) , measurements of S11 S22 S12 and S21 are also possible.
https://deepace.net/wp-content/uploads/2020/10/KC901S-User-Manual.pdf?srsltid=AfmBOopfR0QiIXCBj4jj6NpTAdl5YZx8c06JGzIepV1s62TTVFgxWGOj
https://deepace.net/product/measall-dual-ports-handheld-network-analyzer-kc901r
========================================================
Digital Ampere Meter for special current applications
Why did I build this ? As an example, I'll show you the problem I had...
Before the amplifier turn ON , i have to set the quiescent current, according to the data sheet 1400mA at Vdd 6 Volt. 1. remove R16 0 ohm
2. take a multimeter and in position 2A connect with plus
and minus
3. Then, with the operating voltage switched ON, the
quiescent current is adjusted using the ADJ trimmer.
can measure 2A max, they are either built for 200mA or 20A or 10 amps.
OK , then in 10 amp position !!!
Did you know that an ammeter has a resistance of 0.1 ohms and that at higher currents the value is even higher with a cable.
As it was set, it was relatively OK but as soon as the 0 ohm resistor was put back in everything changed again.
Why ?
There is a shunt in the measuring device and it has a resistance ( otherwise it would not be possible to measure ) but there is also a resistance in both cables themselves , which is particularly bad when higher currents flow through unsuitable cables. When you purchase a multimeter, you'll receive a black and red test lead.
As a customer, you'll think both leads are suitable for all measurements with this multimeter (even for 20A).
The cables also look good, nice and thick, and give no cause for suspicion. The cables are also suitable for all measurements, including currents up to 200mA. Why only up to 200mA ? Well, that's because...
With a diameter of 3.7mm, the cables look nice and thick, but unfortunately the inner conductor is much thinner and unsuitable for 10A current ( needless to mention 20A ), but also not for 1.4 amps.
" Copper is expensive = manufacturer wants to save "
With 2m measuring cable length and 1.4 Amper current, voltage has dropped by almost 0.4V (instead of 6V only 5.6V)
This was the reason why I had two different quiescent current values with and without 0 ohm resistance. The voltage drop on the test cable was too high due to the resistance in the cable.
Since the connections in the multimeter are also not entirely suitable for 20A current, I decided to build my own Ampermeter with really thick connections and flexible cables with a 2mm inner conductor diameter.
============== 10GHz UPconverter =======================
================= 5.8GHz Antenne =====================
https://www.ebay.at/itm/167727201826?_skw=FPV+5%2C8-GHz-Antenne+mit+8+KreisföRmigen+Polarisierten+Antennen&itmmeta=01K56ATP15SMBBQZV49RZA9MHQ&hash=item270d51fe22:g:N3EAAeSwa55opB5j&itmprp=enc%3AAQAKAAABIFkggFvd1GGDu0w3yXCmi1d25NovXrch5qfxXNC7%2BsbbLL9tW%2BB0F%2Fdl9RIqgYPc%2BZ%2B59E3AsyBVKCTPSVRKkp23YLuA7LUHF%2BA4TJUiO8ZSn8IuO71KNrjli%2Fn9MAs0hGSPAau12tsyhNvzKT0FYmw%2BtQswWEVcrrWTfL%2FmXpDbdqjxyuhNSM8nHIh0wuLNVJvLvgLf76VcPD0zHDCDvWA2UKH9euvnAf9xO40Djtg9b%2F6A1jFpqskMLGWQS%2FW3ncNpDVUlpNZJYsdAg7Oq7JggOde%2FBHZ4OdsyKPKtl3dTW4v8%2B5EJ1G%2FerQWQWJ3Q7aKJ%2FsvD2iE%2B6oLmA4KP7jQKYJfcdgJD7XFF%2Fq2oGwPti5nmaSntwXaDzrK7q2wR8Q%3D%3D%7Ctkp%3ABFBMlOHqyqlm
As it is in its original form, it's useless for us amateur radio operators.
Why ?
Because it's not well tuned, in the entire range from 5 to 6 GHz, the SWR is well over 1: 2.5
A new calibration must be performed.....
After the readjustment, very useful technical values were achieved......
============== " Class A" 2.4GHz Amplifier ==============
First test after the quiescent current setting.....
Consumes a lot of current but is relative linear and therefore suitable for all operating modes, from CW to
the worst modulation DVB-T
Vcc: 10V Icc: 8 Amps test on 2400MHz
Here are my first test results....
Input Output Gain
12,5mW 3,5 Watt ~24,6 dB
30,0mW 8,8 Watt ~24,5 dB
67,0mW 16,0 Watt ~23,8 dB
100,0mW 20,0 Watt ~23,0 dB
147,0mW 25,0 Watt ~22,4 dB
old-fashioned analog measurement....
Material procurement:
1. Mitsubishi modules are available from: pauls@metro-cad.com or sales@metro-cad.com
2. PCB 9a6rzn@gmail.com
======================== 5.8GHz Antenna ==================
Purchased from : https://www.alibaba.com/product-detail/5-8GHz-Customized-Directional-Panel-Flat_1601338133274.html?spm=a2700.prosearch.normal_offer.d_image.2c3867afIKPGKj&priceId=4d60ceaa056e44038c40e3867d033784
As it came, i tested it straight away , without any recalibration , here are the measured values....
I think it's a very good antenna , suitable for use in the frequency range 5700 to 5900MHz ,
with very good values. I haven't tested the opening angle , it's intended for vertical polarization ,
but the mount also allows it to be rotated 90° for horizontal polarization.
At 26.54 euros including VAT shipping and customs , you can't go wrong if you need something like this ? and buy one.
============= Octagon Twin LNB =============
Caution: There are several versions of this product in the same packaging under the same type.
The manufacturer reserves the right to change the internal components as long
as the technical specifications remain the same.
1. Two local oscillators, each with a 27 MHz crystal.
2. Two local oscillators, each with a 25 MHz crystal.
3. Two local oscillators, each with a 27 MHz crystal and a bandpass filter.
4. One local oscillator with a 25 MHz crystal and a bandpass filter.
L.O. Freq. Calculation factor ( without 22kHz !!! ) :
27MHz crystal x 361,1111111111 = 9750MHz for LNB with RDA chip
25MHz crystal x 390 = 9750MHz for LNB with RT320M or other chip
Note: When modifying , keep in mind that the PLL lower limit is
around 9300MHz , below this frequency, it no longer locks !!.
Prompted by IC8EPV 's request, " i would like to receive two ATV stations
with an LNB in the around 10400MHz range, and the LO frequency should be
relatively stable, also for DATV , but exactly the same frequency "
The LNB chosen was an Octagon Twin LNB that had already been
modified once and includes an oscillator.
I simply desoldered one crystal and soldered on another with 24MHz , that's it.
 |
| 24MHz TC 20ppm 24 x 390 = 9360 MHz |
Now screw on the lid and test it..., the signal source is a sweep generator
at 10.400 GHz with aprx. -5dBm output at a distance of 2m from the LNB.
Well done, now I've earned a drink.....
Post is still in progress....
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