Re: 2N2222A vs 2N3904 sourcing
Nick,
The Spec Ft is the same for both 2N2222A and 2N3904 .....300 MHz, but the Ic max for the 2N2222A is more than twice that of the 2N3904. Someone (Allison ?) had mentioned the 2N3904s were really being "pushed". That's why they are paired.
73 Kees K5BCQ
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Re: 2N2222A vs 2N3904 sourcing
Hello Ripley,
Q92/Q93, Q96/Q97, Q911/Q912
73 Kees K5BCQ
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Hello Art,
A complete 6x kit includes: a 6x board, 12 relays, 6 blank LPF boards, headers, diodes, capacitors and a 6 position rotary switch for $30 plus $4 for postage in the USA.
73 Kees K5BCQ?
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Re: 2N2222A vs 2N3904 sourcing
$0.0358 each is not bad.
Let us know how this goes.
Moving to a BS170 would take significant changes to the circuit.
A 2n5109 or 2n3866 is going to cost more than $0.0358
I'd probably build a really simple CE amp with 10dB of gain,
feed it 100mhz from the si5351, see if it gives 10dB.
Jerry
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On Thu, Sep 13, 2018 at 03:20 PM, Kees T wrote:
I just bought 50 of them for $3.58 including postage from a USA seller.
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Re: 2N2222A vs 2N3904 sourcing
Hello Kees,
I replaced the two pair of driver transistors with metal can 2N2222As early on in my build per Allison¡¯s recommendation to even out the power across the bands. What is the third pair of transistors in which you refer?
Thank you as always
Ripley KD8UYQ The words are mine but this iPad does what it will with them.
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On Sep 13, 2018, at 4:18 PM, Kees T < windy10605@...> wrote: I think enough work has been done to say the 3 sets of 2N3904 transistors should be replaced with 3 sets of 2N2222A transistors. The 2N2222A is a great transistor but has been around a while and most retailers have classified them as "obsolete" and dumped the plastic versions to surplus dealers to sell. They still sell the TO-18 metal can versions at quite high prices because the military still needs them to repair "stuff". Many surplus dealers now have the plastic 2N2222A parts available for pennies on places like ebay.
Just FYI
73 Kees K5BCQ
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Re: 2N2222A vs 2N3904 sourcing
Most semiconductor FAB shops use ring oscillators spread at strategic location on a wafer to characterize transistor behavior parameters. This is one of the most common techniques to validating the health of a complete wafer. Nowadays this applies mostly to P and N channel CMOS transistors; however the technique is still applicable to all transistors.
--Ron? ?N7FTZ
Jerry,
I just bought 50 of them for $3.58 including postage from a USA seller.
73 Kees K5BCQ
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Re: 2N2222A vs 2N3904 sourcing
Jerry,
I just bought 50 of them for $3.58 including postage from a USA seller.
73 Kees K5BCQ
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Hi Henning,
No, for 80m it works just the same way as for 40m.
For LSB we use low side injection, for USB we use the high side.
on 40m (e.g. 7MHz):
in LSB mode: fLO = 12 - 7 = 5 MHz (= "low side")
in USB mode: fLO = 12 + 7 = 19 MHz (= "high side")
Likewise, on 80m (e.g. 3.5MHz):
in LSB mode: fLO = 12 - 3.5 = 8.5 MHz (= "low side")
in USB mode: fLO = 12 + 3.5 = 15.5 MHz (= "high side")
So the firmware would theoretically work OK as long as we are below 12 MHz (30m, 40m, 60m, 160m, etc.)
If we use it for bands above 12 MHz (20m and up), then it should (theoretically) still work but then the side bands will be flipped.
73, Allard PE1NWL
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Re: 2N2222A vs 2N3904 sourcing
On Fri, Sep 14, 2018 at 07:29 AM, Arv Evans wrote:
Is there any other way to actually measure FT of BJT devices?
?
Art, i found this, but its over my head for now:?
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
I sent you an email as well Kees.? Thanks for all your effort in all this!
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Awesome Kees!? ?I'll take a complete 6x kit (or as complete as you can make one).? PayPal an invoice to jrsphoto@...? I'll put the 4x board in my portable build but plans for a more desktop uBitX are well underway as well.? I'll use this 6x kit for that.? I'll get a 4x kit from you when those are done,?assuming you offer them.
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Re: 2N2222A vs 2N3904 sourcing
Jerry
Since the FT is what we need to know for transistor swaps, it might be possible to
make an oscillator circuit that tunes across the predicted FT value.? Point where the
oscillator stops or will not start could be a good indication of FT for a particular device.
Motorola AN-139 is interesting: Is there any other way to actually measure FT of BJT devices?
Arv _._
On Thu, Sep 13, 2018 at 3:15 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: Kees,
Otherwise unobtainable plastic 2n2222A's available for pennies on ebay?
In this particular case, I'm not so sure about the first part in "Trust, but verify".?
But certainly possible, the recipe has been out there for 50 years.
Ebay might be worth a shot if you want a bunch.
For small quantities on prototypes, I'd just give Mouser their $2 for item?610-2N2222A
If you really want a bunch, then Mouser item?583-2N2222A from Rectron is $0.21 each at quantity 10000.
All 2n2222A's on Mouser have metal cans, which should dissipate more than anything plastic.
Especially if you put some sort of heatsink on them.
Or give them a liquid nitrogen bath.
There are parts that are better than the 2n2222A's, especially if interested in operating above 20m.
Search for 2n5109 in this forum for discussion of that and other parts.
Maybe also search for BS170 too, Mouser price of $0.44 for one, $0.12 each for 100.?
Jerry
?
On Thu, Sep 13, 2018 at 01:18 PM, Kees T wrote:
I think enough work has been done to say the 3 sets of 2N3904 transistors should be replaced with 3 sets of 2N2222A transistors. The 2N2222A is a great transistor but has been around a while and most retailers have classified them as "obsolete" and dumped the plastic versions to surplus dealers to sell. They still sell the TO-18 metal can versions at quite high prices because the military still needs them to repair "stuff". Many surplus dealers now have the plastic 2N2222A parts available for pennies on places like ebay.
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Kees: ? How much is the complete 6x kit? ? David A Posthuma, WD8PUO 1 (616) 283-7703 ?
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From: [email protected] <[email protected]> On Behalf Of Art Olson
Sent: Thursday, September 13, 2018 4:38 PM
To: [email protected]
Subject: Re: [BITX20] K5BCQ uBITX Relay Switched LPF/BPF board? Kees, ? I would like a complete 6x kit ¨C please send paypal request to olson339@... for payment ? 73 Art ¨C N2AJO ? From: [email protected] [mailto:[email protected]] On Behalf Of Kees T
Sent: Thursday, September 13, 2018 2:50 PM
To: [email protected]
Subject: Re: [BITX20] K5BCQ uBITX Relay Switched LPF/BPF board ? Yes, on the 6x LPF stuff. Hope it's a more restrained than the AGC/Click mini-kit ordering.
I just posted the early LPF order status as "K5BCQ LPF Kit Orders" in the uBITX files section under my call.?
73 Kees K5BCQ
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Re: 2N2222A vs 2N3904 sourcing
Kees,
Otherwise unobtainable plastic 2n2222A's available for pennies on ebay?
In this particular case, I'm not so sure about the first part in "Trust, but verify".?
But certainly possible, the recipe has been out there for 50 years.
Ebay might be worth a shot if you want a bunch.
For small quantities on prototypes, I'd just give Mouser their $2 for item?610-2N2222A
If you really want a bunch, then Mouser item?583-2N2222A from Rectron is $0.21 each at quantity 10000.
All 2n2222A's on Mouser have metal cans, which should dissipate more than anything plastic.
Especially if you put some sort of heatsink on them.
Or give them a liquid nitrogen bath.
There are parts that are better than the 2n2222A's, especially if interested in operating above 20m.
Search for 2n5109 in this forum for discussion of that and other parts.
Maybe also search for BS170 too, Mouser price of $0.44 for one, $0.12 each for 100.?
Jerry
?
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Show quoted text
On Thu, Sep 13, 2018 at 01:18 PM, Kees T wrote:
I think enough work has been done to say the 3 sets of 2N3904 transistors should be replaced with 3 sets of 2N2222A transistors. The 2N2222A is a great transistor but has been around a while and most retailers have classified them as "obsolete" and dumped the plastic versions to surplus dealers to sell. They still sell the TO-18 metal can versions at quite high prices because the military still needs them to repair "stuff". Many surplus dealers now have the plastic 2N2222A parts available for pennies on places like ebay.
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Kees, ? I would like a complete 6x kit ¨C please send paypal request to olson339@... for payment ? 73 Art ¨C N2AJO ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Kees T
Sent: Thursday, September 13, 2018 2:50 PM
To: [email protected]
Subject: Re: [BITX20] K5BCQ uBITX Relay Switched LPF/BPF board ? Yes, on the 6x LPF stuff. Hope it's a more restrained than the AGC/Click mini-kit ordering.
I just posted the early LPF order status as "K5BCQ LPF Kit Orders" in the uBITX files section under my call.?
73 Kees K5BCQ
|
2N2222A vs 2N3904 sourcing
I think enough work has been done to say the 3 sets of 2N3904 transistors should be replaced with 3 sets of 2N2222A transistors. The 2N2222A is a great transistor but has been around a while and most retailers have classified them as "obsolete" and dumped the plastic versions to surplus dealers to sell. They still sell the TO-18 metal can versions at quite high prices because the military still needs them to repair "stuff". Many surplus dealers now have the plastic 2N2222A parts available for pennies on places like ebay.
Just FYI
73 Kees K5BCQ
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Re: Have to adjust master calibration on power up - does not save
Ion,
Hey guys, I am an idiot.? My BFO freq. was way off.? The only way I found out was running Ubitx manager to see the saved setting. There was incorrect data entered at one time or another.? Anyway, I got in some good practice with my small torch removing and installing that Arduino. I have now have it set to 119965 and waiting for band conditions to improve.? I tried listening in on another radio but the distance between the 2 is too short. Thanks for all your help. ?
Bob
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Allard,
in addition the "high side" injection must be used and chosen,
because fin = fLO - Fif; e.g. fin = 3.5 MHz Fif = 12 MHz then fLO
= 15.5 MHz.
The "low side injection" as used in the BITX40 does not work (fin
= 7 MHz, flo = 5 MHz then fif = 12 MHz).
Henning Weddig
DK5LV
Am 13.09.2018 um 00:27 schrieb Allard
PE1NWL:
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As far as the firmware is concerned, for monoband operation you
could use the latest Raduino sketch v1.28.1.
This includes the latest enhancements such as spurious prevention,
CW keyer, capacitive touch keyer, improved calibration, etc.
To modify it for 80m, just change the defines for MIN_FREQ and
MAX_FREQ at lines 36 and 37.
And set Region to 0 at line 47.
73 Allard PE1NWL
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Re: uBITX Firmware CEC Version 1.1 Release
#ubitx
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?
Tom
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Hi Kees
at what price for France?
73 QRO Gilles F1BFU / FR
Yes, on the 6x LPF stuff. Hope it's a more restrained than the AGC/Click mini-kit ordering.
I just posted the early LPF order status as "K5BCQ LPF Kit Orders" in the uBITX files section under my call.?
73 Kees K5BCQ
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Ripley
Allard PE1NWL
Nick VK4PP
John Scherer
David Posthuma