Terry, you read things in his post that I certainly didn't.

Vince.

? Michigan VHF Corp.? ?? ?
? ? ? ? ? ? ? ? ? ? ? ? ?

Farhan,

Look the traces for the final to the output transformer.? Make them wide (low impedance).
same for the gate.?

The interaction between the mosfets and the drivers is both closeness the three toroids try to couple
being very close.? I found that alternating them front and back tamed it so its a space issue.
From the output to kT1 (filter select) get close to the driver and pre driver.? All of the relays in
mine are now wrapped win copper tape and grounded.? Isolation improved and the unwanted
regeneration(TX) is helped.

Running with grounded (and insulated heatsinks) helps also with feedback issues.

The 45mhz amp is tepid, the 2n3904s (q10 and 20 in the V3 schematic) are not doing well at 45mhz?
just the common emitter stage as the emitter followers are fine there.? Changing them to BF106
(handy but other high FT parts should work) brought the stage gain to calculated rather than
about measured 7db.? The 2n3904 is an inexpensive workhorse part but the -3db gain corner
is 15mhz in a 16db feedback amp (TIA helps a tad).

Allison

I have no idea at what point phase noise will be an issue for the si5351 across?
the various modes of operation, be it SSB, CW, FM,? or digital.
I do know that it works to 200mhz, you can push it to almost 300mhz.
Phase noise and resolution of the si5351 will be 10x worse at 200mhz than at 20mhz.?

Bringing on an Si5340 would be a nice handy sledge hammer for prototyping,?
goes up to 1028mhz, resolution of ppb, and has very low jitter.??
Likely cheaper and lower power ways to do what you need, but it's a nice part.
Not many hobbyists are using it, you might be writing your own code, and that could get nasty,

The Si5338 is a bit cheaper, and lower performance.?
But better than the Si5351.
Again, you might be writing your own code.

Both cost a fair bit more than the $1 Si5351, and are surface mount with a bunch of pins.




Jerry



On Mon, May 28, 2018 at 03:21 pm, Terry Morris wrote:

Both the question and the response/answer are intriguing to me. Mostly the answer. I don't comprehend most of the answer but I think I get the gist of it. Regarding the latter part of Jerry's conversation speaking about the Si5338, Si5340, and Si5341 is there any other downside other than the loss of about 1 w at 1.8v? I am presuming from your explanation of these devices that there is a positive advantage to using them, not only for 2 meter capability, but for better phase noise suppression and better crosstalk reduction. In an example that I might understand better, would using any of those 3 devices be like the performance difference between an analogue HW-9 and any of the modern commercial transceivers?

?

Arv,
I did a Google Search for this site. Maybe I should never tried being a good guy. If there are problems with the books then google should not list them. I submitted this site for info and help for hams like myself who asked for help learning about ardurinos and no answer. Some who are quick to burn someone for honestly trying to do good sounds like a left liberal always trying to find something wrong with the good unless theyhad a hand with it.
Well sorry. I guess I'm not worthy of being on this fourm. I've been a ham for over 35 years. And in that time I always tried to pass on good info, suggestions etc to HELP MY FELLOW HAM. im still going to deal with ashlar by buying several rigs off him and helping beginning hams get on the air cheap. Obviously you and a few others don't like someone trying to help. If I did something wrong, I haven't a clue. If, I guess some books on that site shouldn't be, then google and others need to ban it.the authors need to have them removed.? Guess no one complains when they download ham radio e-books or magazines that are offered. I will cancel my account because this will make u happy. Just another of the many fourms I belong to. One less won't bother me a bit. Ur attitudes remind me of the fake witch hunt going on with our great president. Only if it serves your purposes.

Guess I won't try to help any ham on fourms like this again. Shame I bet u have the same attitudes towards cbers who try to convert to ham radio. So quick to ban me for honestly trying to help. No malice, no slide of hand, no sneaky business.

Yes I will ban myself since the king has spoken, ur probably some who bicker on this fourm alot. U can have it. I will deal with ashhar directly by email. You don't control ham radio as a whole. That is the problem today high do something wrong even by mistake, ur spied on, banned or excluded.

Wow hey ever thought of emailing me directly and explaining what I might have supposedly done wrong?
Guess if a noobee was to send too many Cqs while attempting his first transmission u would make him quit for his outrageous mistake.

I have 4 more rigs to buy and I won't bother anyone here about it. Shame. We are ashhars customers, not urs.

Anyway I'm gone, sorry for any mistake. Back on the bands with qrpp cw.

Ka9koj








Sent from Yahoo Mail. Get the app

--------------------------------------------
On Sun, 5/27/18, Paul Schumacher via Groups.Io <wnpauls=[email protected]> wrote:

?Subject: Re: [BITX20] ardurino tutorials and books
?To: [email protected]
?Date: Sunday, May 27, 2018, 4:44 PM
?

? ? ? ? ? ? ?I agree, we should not ban anyone who makes
?an honest mistake.
?(I would have
?been banned a long time ago).?

?My
?college students thinks it is perfectly okay to steal
?software, and we
?try to guide
?them? to the right way.? (They will be writing software
?that theydo not want to be stolen).? They just

?need to see it differently.? It is part ofthe
?internet? culture that needs work!
?Paul K0ZYV







? ? ? ? ? ? ? ? ? ? ? ? ?On Sunday, May 27, 2018, 2:23:12 PM
?CDT, Roy Appleton <twelveoclockhigh@...> wrote:





? ? ? ? ? ? ? ? ? ? ?No he
?should not be banned!
?RoyWA0YMH
?On Sun, May 27, 2018, 12:06 PM Arv Evans <arvid.evans@...>
?wrote:
?The message containing that
?free book URL has been deleted.? Of course that does not

?eliminate the message copies
?that have already been sent to subscribers.? The person
?who posted the message seems to
?be a relatively new ham, and one who is new to this
?group.? This situation raises
?some questions...should the person who sent the FREE Books

?URL be banned from ??

??Some of the books on their
?list are self-published documents that were probably
?rejected
?by mainstream publishing
?houses.? Some obviously originated in countries that do not

?have copyright or other
?document protection laws.? Some are actually advertisements
?and
?political or personal agendas in the
?guise of free books.? And a few seem to be copies of
?legitimate books.? ?

?Arv? K7HKL
?_._



?On Sun, May 27, 2018 at 9:33 AM Bo Barry <bobarr@...>
?wrote:
?Ain't giving my credit card
?number to something that says it's free.

If you don't have a scope, perhaps you have or can borrow a receiver that can tune those oscillators in.
The oscillators are an unmodulated carrier, so best if the receiver is in SSB mode so you can year a tone.
But an AM receiver can be used, it should go quiet as you get near the signal.

If you have a 12mhz crystal filter for the IF, the BFO should be 2 or 3 khz below 12mhz.

Jerry



On Tue, May 29, 2018 at 01:34 am, Raj vu2zap wrote:

First check if your VFO and BFO are working correctly.

Put an oscilloscope to C100 and see if you have a good voltage of your BFO frequency. Check the frequency of
BFO with a frequency counter.

On Tue, May 29, 2018 at 10:26 am, Ashhar Farhan wrote:

TDA1220

Superregen at 45mhz as AM/FM detector... I can't go there.? ;)? I did it 40 years ago at 10.7mhz
I learned a lot.? I wanted a RX that could hear Aircraft (118 to 136mhz) and 2M fm (144-148).
Its a great way to go for low power consumption and poor selectivity, not a no tune design!

Took a bit of digging to find a data sheet.?
Yes, but try to buy them from non questionable sources.? It went EOL years ago so the only
parts are NOS (new old stock that have been sitting).? However something like that would
solve the RX problem and needs to work at the 12mhz IF and its upper frequency for the
TDA1220 is 30 mhz.? It was a 1994 part and I even have two of them.? That and two filters
plus three tuneable cans to add fun to ones life.? ?Look for the TDA-7000 (also EOL) as
that works easily at 45mhz for FM rx.

That type of part goes in and out of fashion rather quickly but there is always something
new to replace it.??

It still leaves generating AM and FM.? Double sideband AM is easy,? sum the 45mhz though
a 6DB pad and a DBM and you get perfect low level modulation.? Gain down stream
becomes critical as the carrier has to be 1/4 peak power or it sounds distorted.

For AM and power do a class E rig.? Using switching fets its fairly easy to do
Monoband AM at 50W or more (with switchmode class D modulator).s

FM in the current scheme means audio to digital and feed that to the SI5351.? I think?
a bigger MPU might be needed. The alternate is 12mhz crystal osc and FM it using
a varicap diode, not? a no tune approach. That also requires audio processor
(preemphasis and clipping/limiting).

Both AM and FM will easily pass through the 45mhz filter and its wide enough.

I cut my teeth on AM (marine radio pre VHF and aircraft) and FM (Land mobile
and Marine VHF)?commercial stuff must be 50 years ago.? It was fun.??


Allison

Alison,

My main interest was in demodulation. With its full HF coverage lack of proper AM detector seems a major feature lacking in the rig. NBFM comes as bonus with this chip. TDA1220 has an internal? AGC for AM. I feel simple addition of this add on board will? make uBitx a very fine Gen coverage Rx.?

FM can be done possibly shift the BFO to 15MHz? phase modulate and triple it for decent deviation and modulation index and pass the signal thru 45MHz filter up reverse. As you rightly say cost and complexity will go up and we still wont be able to beat a Baofeng and a 2nd hand 817 will be a better option.

With the new Ver 4 boards and connectors across the 12MHz filter I foresee people trying out parallel CW xtal filter mod soon hence thought about a plug in board.

73

Rahul VU3WJM