Keyboard Shortcuts
Likes
- BITX20
- Messages
Search
|
Re: 2N2222A vs 2N3904 sourcing
>>>The Mini-Circuits ERA-5+ MMIC is a single, pin head sized gain block that provides 20 dB of gain nearly flat out to 4 GHz with a 1 dB compression point at +18 dBm. It is 50 ohm in and out and works great on 12V. Three of these in series would make an extremely low component count, 60 dB gain block that is absolutely flat for the frequency range involved.<<<
Warren, Both Jerry and I tried? that.? I use MAV11 a lower gain higher output part and getting to oscillate in ubitx environment was trivial.? Getting non-oscillation was very very difficult.? Jerry tried as a replacement for RV1 I tried at pre Q90, and also as replacement for Q90.? Board layout was not friendly. I did try the 2n6661 (VMOSfet) for the drivers and at first pass they were very good? but most people would choke on the price ($15 ea).? Never tried BS170 or 2n7000 as those are fairly decent to 100mhz as wide band amps at moderate power. Allison |
|
Re: 2N2222A vs 2N3904 sourcing
Allison,
Yes, it's like herding cats ......? many different ideas, many cats. 73 Kees K5BCQ? ajparent1/KB1GMX 8:00am???#59377??
Ralph yes right here about 6 wweeks ago.
We repeat everything here at at least 5 times.? Sometimes more. Allison |
|
Re: 2N2222A vs 2N3904 sourcing
I have ordered many small parts off ebay from China.? One has to be very careful as there seem to be many substandard parts.? You may get a good batch from one source and a bad batch from another. I have some RF power transistors of the 10 to 20 watt range.? They do now work at 10 MHz and above at all.? They do seem to work ok at DC and audio frequencies.? So will use them in audio output circuits. de ku4pt On Fri, Sep 14, 2018 at 11:13 AM Warren Allgyer <allgyer@...> wrote: Sorry Iz, I mis-typed. It is the ERA-3SM+ that is available for less than 1USD on eBay. It is from a Chinese supplier so it will require due diligence in testing.? ? I have them on order for test. |
|
Re: 2N2222A vs 2N3904 sourcing
Ok Warren, sv1avn is a good supplier as rf-microwave is, of course if you test the mmic from the Chinese supplier are ad good too I might well consider it. Thanks for testing them and keep us informed! Il 14/set/2018 17:17, "Warren Allgyer" <allgyer@...> ha scritto: The 23 dB gain, 2.4 GHz MMC amp module I tested is here:?? ? ?It costs $17 delivered from Greece. |
|
Re: raduino connections on bitx40
If yours has 16 pins along the bottom you got a raduino configured for the ?BITX.? The BITX40 raduino has 8 pins on top and 5 on the bottom.? Except for the pins the hardware is the same and you can use it for the BITX40.? You probably have to load the correct sketch.? I don't remember off the top of my head how to connect it but you should be able to find other posts with instructions as this has happened before.
-- |
|
Re: 2N2222A vs 2N3904 sourcing
Warren Allgyer
Sorry Iz, I mis-typed. It is the ERA-3SM+ that is available for less than 1USD on eBay. It is from a Chinese supplier so it will require due diligence in testing.?
I have them on order for test. I have a MMIC amp from SV1AFN with similar specs that I just tested. Very clean, 23 dB of gain. A two tone test showed it does IMD of -50 dBc at -5 dBm out. It did -24 dBc at +5 dBm out. I will run similar tests on the 70 cent chinese ERA-3SM upon arrival. WA8TOD |
|
Re: 2N2222A vs 2N3904 sourcing
Warren, from Rf-microwave, which is a reliable supplier, they cost more than 6Usd each. Can you provide us the name of the ebay seller that offer Era5 at 1Usd really made by Mini Circuits? Il 14/set/2018 15:36, "Warren Allgyer" <allgyer@...> ha scritto:
|
|
Re: 2N2222A vs 2N3904 sourcing
Warren Allgyer
There is a much better way. Very radical but probably less costly and better performance? The Mini-Circuits ERA-5+ MMIC is a single, pin head sized gain block that provides 20 dB of gain nearly flat out to 4 GHz with a 1 dB compression point at +18 dBm. It is 50 ohm in and out and works great on 12V. Three of these in series would make an extremely low component count, 60 dB gain block that is absolutely flat for the frequency range involved. |
|
Re: uBITX Firmware CEC Version 1.1 Release
#ubitx
When I try to start Xloader I immediately get the message "Xloader is not working. ?Looking for a solution." ?This occurs whether I have the USB cable plugged in or not.
Is there an alternative to Xloader? |
|
Re: 2N2222A vs 2N3904 sourcing
Yes!
and over 200 posting about it. And no forcing 3904s to marginal gain.? Throw the damn things out.? If you want to use them do it right rather than struggling.? First 5 stages at low gain, its all the? 3904 can do 10-11db as you still need about 60db gain over all. The goal then was flat 10W, at the point where spurs and? hunting other illnesses took over I was at 12W at 80 and 6-7W at 10M. Then I noticed at 28mhz we are barely 30db down for the 17mhz spur!? At that point a useful and functional 10m capability was a waste of effort. Then there is the carrier leak... and the lowpass filter failure. Allison ? |
|
Re: uBITX Firmware CEC Version 1.1 Release
#ubitx
Tom Uploading any firmware through Xloader will not damage the boot area on Arduino Nano.?Check if the serial port is recognized normally. Also check that CAT communication is being performed. If your Nano is damaged, it is recommended to use the ICSP tool and the Arduino IDE. Ian 2018? 9? 14? (?) ?? 4:38, Tom Cooper via Groups.Io <w1eat=[email protected]>?? ??: I downloaded V1.1 and XLOADED the 16P version it to my uBITX V3.? All I have now is a top line of boxes on my standard isssue display and XLOADER will no longer work in order to re-install V1.061.? Any suggestions? |
|
Re: bitx40 on 80
Timothy Fidler
re prev message , PM,? on suggestion of diode switch of BPF element. Using a? ?BAT 592 PIN diode is better than trying to press a small sig diode into duty.? If you cannot source this part then look at parts anchor-electronics of Santa Clara (mail order)? has for sale. Look at diodes on his PDF? and look for one he calls antenna switching diode. I am assuming you are in the US.
|
|
Re: K5BCQ uBITX Relay Switched LPF/BPF board
¿ªÔÆÌåÓýHello Kees, ? Please count me for one complete kit and relays 6xLPF 73¡¯s de Jacques ¨C F1APY ? From: [email protected] [mailto:[email protected]] On Behalf Of Kees T ? Yes, on the 6x LPF stuff. Hope it's a more restrained than the AGC/Click mini-kit ordering. |
Joel Fournol
WS1M - bammi