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Date
Re: #ubitx Re: Ubitx only on preorder now #ubitx
Correct, a custom clearance fee but there should not be any taxes.
By Ken · #38064 ·
Re: #ubitx Re: Ubitx only on preorder now #ubitx
DHL will charge a customs clearance fee and ?HST will be applied to the value of the goods on top of that.? For the BITX40 the extra charges were around $Can 30, so it will be more for the uBITX.
By Michael VE3WMB · #38063 ·
Re: Tell me your favorite uBitx mods
So, this is roughly what I'm thinking for the layout thus far. Here's what you're seeing thus far: uBitx is underneath the PCB on .5" standoffs (Supplied with the uBitx kit). The uBitx itself is 1/4"
By Diver Martin <diver.martin@...> · #38062 ·
Re: #ubitx Power output on 40 / 80 m with high current levels #ubitx
Alex: What you are doing is all the right things to find the right combination to drive the IRF510's. Get a hold of and really read the original article by WA2EBY for all the things he discovered
By John Backo · #38061 ·
Re: #ubitx IRF510 concerns, different modes #ubitx
General rule of thumb is no more than 25 to 30% of the total output of the rig. He always control the output by the audio level in and if you can monitor it back off until the alc Barely indicates....
By Art Howard · #38060 ·
Re: #ubitx IRF510 concerns, different modes #ubitx
?
By Art Howard · #38059 ·
Re: Tell me your favorite uBitx mods
So looking at the schematic, it's basically an IF amp (MC1350P, which is obsolete/harder to get, though I have gotten them from Jameco before) with a dual gate mosfet as the attenuation stage. The
By Diver Martin <diver.martin@...> · #38058 ·
Re: Tell me your favorite uBitx mods
You save on package count with the TPIC6B595. It¡¯s basically an HC595 with 150 mA sink drivers. <http://www.ti.com/product/TPIC6B595 <http://www.ti.com/product/TPIC6B595>> Clark Martin KK6ISP
By Clark Martin · #38057 ·
Re: #ubitx IRF510 concerns, different modes #ubitx
Alrighty, was just thinking about the duty cycles and such. Would make sense to just back off the input gain. -- ---------- N5WLF, Greggory (or my nickname, Ghericoan) General Class, Digital Radio
By Ghericoan · #38056 ·
Re: Selecting the correct BFO frequency
It definitely matters if the BFO is above or below the crystal filter passband. I was talking both transmit and receive in that last post, but the math is the same regardless of which direction the
By Jerry Gaffke · #38055 ·
Re: Got Mine Built #ubitx
OK, here is the file to use for laser/cnc cutting of the case I made. I cut in out of 1/8" (3mm) MDF. Since that is a little too thick for the supplied? jacks, you may need to glue the jacks into the
By Terence Taylor <n6mon@...> · #38054 ·
Re: #ubitx IRF510 concerns, different modes #ubitx
Greggory --- it won't be nearly the problem you're thinking.... Just tone down the audio level into the mic if you want a lower power level. With single side band, that proportionately reduces your
By Gordon Gibby <ggibby@...> · #38053 ·
#ubitx IRF510 concerns, different modes #ubitx
I have yet to get my ubitx yet, as I am on the preorder list. But I was wondering if there is a way to back the power output down to five watts to save the heat stress on the IRF510s. I am looking to
By Ghericoan · #38052 ·
Re: Tell me your favorite uBitx mods
Ref: Item 6 (Keying interface for a linear.) http://bitxhacks.blogspot.in/2017/12/adding-external-linear-amplifier.html
By AndyH · #38051 ·
Re: #ubitx Re: Ubitx only on preorder now #ubitx
I ordered one the 15th, I have no clue when it will come in. I was hoping for Christmas but knew it wasn¡¯t likely. Oh well, gathering a lot of good info on this list and looking forward to when it
By John Miller <n1umjjohn@...> · #38050 ·
Re: #ubitx Re: Ubitx only on preorder now #ubitx
Andrew You shouldn't be dinged for customs as we have an exemption up to a limit. 73 Ken VA3ABN
By Ken · #38049 ·
#ubitx Power output on 40 / 80 m with high current levels #ubitx
Hi all, I'm working on my uBitx which is completely homybuilt, so not the currently sold PCB version. By building it from scratch you encounter a lot of interesting things and learn a lot about it.
By Alex - PA1FOX · #38048 ·
Re: Tell me your favorite uBitx mods
Figured out what my plan was on that front. I want to re-use as much of the raduino as possible, so one thing I did to make my life easier was to use a 74HC595 shift register, frees up IO's, and uses
By Diver Martin <diver.martin@...> · #38047 ·
Re: Tell me your favorite uBitx mods
There are many 3.3v 16 X 2 displays advertised on Ebay. Practically giving this one away.
By K5ESS · #38046 ·
Re: #ubitx Re: Ubitx only on preorder now #ubitx
I ordered mine on the 12th of December and it's due here in VA3 land on Jan 3rd. I ordered it and had it sent DHL for Christmas and later on found out they were previously sold out. If I'd known they
By Andrew Farkas <afarkas@...> · #38045 ·