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I really, really like WebSDR receiver site near San Francisco:?

I listened for a little while. After the net cleared outta 7.277 I heard
nothing there for the rest of the time I was listening. Never did hear
anything on the other two freqs mentioned. So I went back down to 7.074.

--
Michigan VHF Corp.

I also listened? last night but was clobbered by the broadcast station on 7275

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Well, it is said you should learn something new everyday, but not sure now knowing what 72's means is mine for the day!

Who would have Thunk?

72's

Mike, WA6ISP

Actually, probably not. Gary was using the QRP sign-off, which is 72.

Jack, W8TEE

---

From: Michael Hagen <motdog@...>
To: [email protected]
Sent: Monday, October 9, 2017 12:02 PM
Subject: Re: [BITX20] A couple of BITX observations and a Pop question.

We only got "72's".? You shorted us one!

Mike, WA6ISP

On 10/9/2017 8:50 AM, Gary O'Neil wrote:

Hi gang...

??

??? 72

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

I have no idea what a webdsr is!?
--
John - WA2FZW

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We only got "72's".? You shorted us one!

Mike, WA6ISP

Hi gang...

??

??? 72

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Hi gang...

??? I'm new to this list and coming up to speed on BITX40 mods. I started looking at the Raduino software to add a rotary encoder for improved tuning control, when I learned of this group a couple of weeks ago. I've since incorporated the Raduino 1.24 (maybe 1.25) software. Tuning is much improved, and many features have been added. I have stalled at making some of the hardware mods to the board until I can verify and understand the added features.

??? Starting first with an observation that may prove beneficial during troubleshooting that I didn't find in the history. I discovered that the multi-filar transformer windings are twisted many times more than necessary; putting them at risk of failure. This caused the enameled wire insulation to rupture and induce a part fart (R70) on my board after only a brief period of operating. A scan of the remaining transformers revealed this exposure exists on all of them. It's a bit of a pain to rewind and replace them in their mounting headers, so I've made a mental note to check them first when troubleshooting for failures down the road. I also think I alerted Farhan to this in an email, so new builds may have been screened for this.

??? CW is a mode of choice for me, so I was quite pleased to see early software support for this in Allard's most recent releases. I have been studying the hardware and Raduino software, and reviewing the posts relating to the mods. I struggled with understanding how the CW mode was implemented, but finally sorted it out. I'm confident that it works, but it uses a somewhat convoluted scheme to add (LSB) or subtract (USB) the sidetone frequency so the displayed transmit and receive frequencies match. :-)

??? I read that a "Pop" issue induced during PTT operation, has been identified and isolated with confidence to the powering up the Mic amp (Q12) as the root cause, but I'm uncertain it was resolved. Has anybody attempted to replace or bridge R127 with a forward biased diode (anode toward TX)? This snubs the R127/C124 (10 ms time constant) power-up delay by enabling C124 to charge instantly to within 0.7V of supply, and well within Q12's normal operating bias range. If this is indeed the root cause for the pop, the diode will prevent it.


--
72

Gary, N3GO

tsalmon534

I have converted my BITX40 to 20 meters.? I bought the qrp-labs Band Pass Filter and Low Pass Filter for 20 M and replaced the built in ones.? I think I made one change to the Raduino software to swap to 20 meters.? Works great on 20 M.? Definitely??remove C91 and C92?as VFO will be at 19 MHz for 40 Meters USB? and 26 MHz for 20 Meters -?

Greg
KD4VV

I'm not sure how the 7.277 frequency was chosen for our Sunday night QSO parties since I'm an old VHF/UHF guy just getting into HF? and not familiar with how everything works down here, but the complaint of QRM from the broadcast stations has been an issue now for a few weeks (there was one on 7.275 last night).

Last night there was a net operating on 7.277 past 7PM EDT, so I proposed an alternate of 7.282 which was clear when I posted. I did manage to have a brief exchange with Tom, VE3THR? on that frequency. I stayed on there until 7:30 (when the Yankee game started; LOL) and didn't hear anyone else. I understand that later on, there was a QSO going on that frequency, so Jerry, W0PWE, tried 7.285 (not sure if you had any success there, Jerry).

Anyway, unless someone more familiar with 40 meter ops has a better idea, I would propose that we keep 7.277 as the primary frequency for now, but standardize on 7.282 and 7.285 as backup plan "A" and "B". I actually had one VFO set on 7.277 and the other on 7.282 last night so I could jump back and forth easily.

Please, I know there are a bunch of you who are regulars on Sunday night, so please give us your thoughts and let's come up with a plan we can all agree to so we're not scrambling at the last minute next week.?

--
John - WA2FZW

Thanks Smitty. Shoulda thorta that.

I'm well answered - we live with it and sneak what we can where and when we can (courteous always of course).

I had to ask - I'm a long-time V/UHF man, not on HF (yet!)

73, Dex ZL2DEX

I relocated the IRF510 to the other side of the board and have it screwed to the metal case I have the Bitx40 in. I currently use a 19v laptop supply to power the rig with 19v on the IRF510 and a small DC DC converter set to 12v to run the rest of the rig. This allows me to power the rig from any voltage above 12v to a max I have tested of 28v without having to make adjustments or mods to have the correct volts on the board and raduino.
I have 2 rigs set up this way, 1 on 40 and the other on 80 meters,neither have any issues with getting too hot at least on SSB.
--
Mike VK3XL

Ryan

In this blog post: ?
you mention audio oscillations when the volume pot is at a minimum.
Maybe you have solved this, that's an old post. ?But if not:

Raj has found that the LM386 oscillates when the input pin is at a low impedance,
the solution is to add a 1k resistor between the volume pot middle pin and pin 3 of the LM386.
/g/BITX20/message/32154

Jerry

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Hi folks

What's the Federal view? The bandplan? Is 7.2-7.3 secondary for Hams? Or the whole of 40m? Are these interlopers, or are we? Are they US? CA? South of the border?
In short, do we have to 'wear it' or does someone need to be stepped on with big boots?

73, Dex ZL2DEX

Not only possible but tons of fun! Highly recommended as a great use of the BITX40. I've done FT8 on 40/30/20 with it and it works well.?

--
Ryan Flowers W7RLF

?

?<-- Learn how to go digital on the BITX40