Date   
Re: RS-918 vs Elecraft K2 on cw

DrZ <zehrhj2@...>
 

I had actually meant to post this on the RS-918 group.  I have too many tabs up!
I have a uBitx, configured for cw.  The RS-918 is much more versatile and pleasurable to use on CW.  I'm having fun working on the uBitx but honestly, it is nowhere in the same league for cw. (I haven't tried SSB or digital on either.)

Howard K4LXY 

Re: Unwanted radio, yet SHIPPED!

Gordon Gibby <ggibby@...>
 

UBitx or BITX40?




On Apr 5, 2018, at 10:26, Mike K0JTA <mike@...> wrote:

I had initially placed an order for a BITX, then canceled this order.
(Or, so I had assumed and hoped...)

Today, I received a notice from PayPal that MY ORDER HAD BEEN SHIPPED (and paid for.)

In looking through my email's trash, I see that I have a total of FOUR order numbers!!!!

When I went to the web site ( http://www.hfsignals.com/index.php/bitx40/ ), I was unable to find any way to contact the maker of the unit(s) that I apparently have on order.

On the PayPal order/shipping email, I finally did spot am email address!!  This is the wrong way to "allow" a customer to make contact, I must say.  The email address in my PayPal invoice/shipping statement is:  teamhfsigs@...

-Is this correct?  Are there other means to contact the seller of the radio? 

In my trash, I (finally) noticed that I had FOUR order numbers!!!!!!!  -Does this mean that I will be getting three more PayPal invoices?????

Thank you!  Mike, K0JTA

Re: RS-918 vs Elecraft K2 on cw

Arv Evans
 

Howard K4LXY

But, since this is the BITX discussion group...how do these much more expensive
radios compare with your BITX40 or uBITX transceivers?

Arv  K7HKL
_._




On Thu, Apr 5, 2018 at 9:10 AM, DrZ <zehrhj2@...> wrote:
I've been doing some rough comparisons between these two rigs.  I find the RS-918 much easier to listen to due to the DSP NR that reduces background noise.  They draw about the same current on receive, but in my initial test, the 918 drew less on Xmit (I plan to recheck this as soon as I get an ammeter built into my power supply line).  Receiver sensitivity seems comparable.  The K2 of course has no band scope though its tuning knob is more comfortable overall  (due, in part, to the replacement tuning knob I have on the K2).  The K2 offers more band width choices, but I find the 300 on the 918 to work nicely for most things.
Though I love Elecraft, I'm guessing I may sell the K2 at some point.
Howard K4LXY


Re: Fw: Re: [BITX20] Digi-Key’s KiCAD library #kicad

Craig Wadsworth <cwadsworth@...>
 

Ashhar and others on this list use KiCAD, so I was thinking of learning to use that. This is akin to asking which baseball team is the best, but what is your favorite EE CAD package for drawing something bigger than an audio filter and smaller than a bread box? That’s a subjective question to ask a bunch of tech people, but I’m curious about what y’all think.
73 de w9ctw

RS-918 vs Elecraft K2 on cw

DrZ <zehrhj2@...>
 

I've been doing some rough comparisons between these two rigs.  I find the RS-918 much easier to listen to due to the DSP NR that reduces background noise.  They draw about the same current on receive, but in my initial test, the 918 drew less on Xmit (I plan to recheck this as soon as I get an ammeter built into my power supply line).  Receiver sensitivity seems comparable.  The K2 of course has no band scope though its tuning knob is more comfortable overall  (due, in part, to the replacement tuning knob I have on the K2).  The K2 offers more band width choices, but I find the 300 on the 918 to work nicely for most things.
Though I love Elecraft, I'm guessing I may sell the K2 at some point.
Howard K4LXY

Unwanted radio, yet SHIPPED!

Mike K0JTA
 

I had initially placed an order for a BITX, then canceled this order.
(Or, so I had assumed and hoped...)

Today, I received a notice from PayPal that MY ORDER HAD BEEN SHIPPED (and paid for.)

In looking through my email's trash, I see that I have a total of FOUR order numbers!!!!

When I went to the web site ( http://www.hfsignals.com/index.php/bitx40/ ), I was unable to find any way to contact the maker of the unit(s) that I apparently have on order.

On the PayPal order/shipping email, I finally did spot am email address!!  This is the wrong way to "allow" a customer to make contact, I must say.  The email address in my PayPal invoice/shipping statement is:  teamhfsigs@...

-Is this correct?  Are there other means to contact the seller of the radio? 

In my trash, I (finally) noticed that I had FOUR order numbers!!!!!!!  -Does this mean that I will be getting three more PayPal invoices?????

Thank you!  Mike, K0JTA

Re: #ubitx Shocks and vibration proofing the uBitx #ubitx

Arvo W0VRA
 

On Thu, Apr 5, 2018 at 04:58 am, John wrote:
I want to try to avoid field failures due to shocks and vibrations. 
To mitigate shock and vibration getting to the PCB consider something like LORD Micro-Mounts.

https://www.lord.com/products-and-solutions/passive-vibration-and-motion-control/industrial/isolators/micro-mount

There's a cute little demo video on that page.

I don't know what to expect for pricing or ordering hassles, but here is the distributor page.

https://www.lord.com/products-and-solutions/passive-vibration-and-motion-control/where-to-buy---industrial

Potting with hot glue as suggested will help prevent relative movement between toroids and the board; they are only secured with very thin wire and solder.  The heat sinks on the finals are cantilevered masses that will induce strain at the point where the terminals connect to the board; that's where they will fatigue and ultimately break.  The finals themselves are likely very robust against vibration damage so it might be better to mount the heatsink and finals to the case and use flexible wiring to connect them to the PCB, or to put the heatsink/finals module on its own isolation mount.  Same idea with the Raduino.

Re: #ubitx Shocks and vibration proofing the uBitx #ubitx

Doug W
 

Hot glue is your best bet.  Poor man's potting to the rescue.  It holds very well and removes easy enough for repairs and upgrades.  Make sure your cable bundles aren't so tight that they are putting stress on the outer cables in the connectors as they bend into the bundle.  No reason you couldn't also hot glue the connectors in place and the wires coming out as a means of strain relief.

Re: Open letter to the uBITX community from Jim Sheldon, W0EB. #ubitx

Dexter N Muir
 

do you mean Bill or Jim? Does Jim have a podcast?

Re: BITX40 - L2 and L3 #bitx40 #bitx40help

Gordon Gibby <ggibby@...>
 

(superglue)  ​That's a great idea!!   


gordon



From: BITX20@groups.io <BITX20@groups.io> on behalf of Lawrence Galea <9h1avlaw@...>
Sent: Thursday, April 5, 2018 7:35 AM
To: BITX20@groups.io
Subject: Re: [BITX20] BITX40 - L2 and L3 #bitx40 #bitx40help
 
Cyanoacrylate (superglue) would allow a quick repair and the toroid parts would be closer together due to a thinner layer compared to the usual two-tube adhesive.
Regards
Lawrence

On Thu, Apr 5, 2018 at 11:00 AM, Mvs Sarma <mvssarma@...> wrote:
However, a broken toroid after having calibrated a coil, If glue repaird, would change its value. Perhaps the inductor value woudl reduce silghtly.  After the suggested gluing, I would recommend to peak the filter for performance.

Regards
MVS Sarma
 

On Thu, Apr 5, 2018 at 2:25 PM, Gordon Gibby <ggibby@...> wrote:
A bit of 5 min epoxy to hold them together tightly is all I would do.  

Just bits of metal suspended in ceramic/resin. 




On Apr 5, 2018, at 04:22, chris gress <Chrisg0wfh@...> wrote:

The cores for L1/L2 are T30-6 the copper wire is 40 turns I am not show of the wire swg the cores are yellow I believe you should be able to pick up new cores easily got mine off eBay cheep chris 

On Thu, 5 Apr 2018, 08:48 , <jaeinsf@...> wrote:
Hi,

I recently received a BiTX40 (thanks to the people who helped me with finding the manual).  While going through the various topics here, I was taking a closer look at the board and noticed L2 and L3 are cracked.  I noticed someone had answered another question about parts and suggested, http://www.partsandkits.com but I do not know enough of the part, besides it being 6uH based on the schematic, to be able to order a replacement.  Would someone be kind enough to let me know the part number and the specs for the part for my education.

Thanks!



#ubitx Shocks and vibration proofing the uBitx #ubitx

John <passionfruit88@...>
 

As I use my rig mainly in portable situations, I want to try to avoid field failures due to shocks and vibrations. 

I am particularly concerned about the toroid coils and maybe the larger electrolytic capacitors.

I have my finals mounted firmly to a larger heatsink attached to the case so they will be ok.

I have some limits as to how much padding I can add as I want to use the rig /PM as well. 

I have also decided to avoid the extra weight of a "Pelican" style case.

So I have three questions: 

1. Are they other components I should be concerned about?

2. What method so you recommend: hot melt glue, epoxy glue, superglue or other method?

3. What about the cables, I have them bundled at the exit of the connectors wherever I could. Any other actions I should take?

Not wanting to hijack the Bitx40 thread about L2-L3.

Thanks and 73, 

John (VK2ETA)

Re: BITX40 - L2 and L3 #bitx40 #bitx40help

Lawrence Galea
 

Cyanoacrylate (superglue) would allow a quick repair and the toroid parts would be closer together due to a thinner layer compared to the usual two-tube adhesive.
Regards
Lawrence

On Thu, Apr 5, 2018 at 11:00 AM, Mvs Sarma <mvssarma@...> wrote:
However, a broken toroid after having calibrated a coil, If glue repaird, would change its value. Perhaps the inductor value woudl reduce silghtly.  After the suggested gluing, I would recommend to peak the filter for performance.

Regards
MVS Sarma
 

On Thu, Apr 5, 2018 at 2:25 PM, Gordon Gibby <ggibby@...> wrote:
A bit of 5 min epoxy to hold them together tightly is all I would do.  

Just bits of metal suspended in ceramic/resin. 




On Apr 5, 2018, at 04:22, chris gress <Chrisg0wfh@...> wrote:

The cores for L1/L2 are T30-6 the copper wire is 40 turns I am not show of the wire swg the cores are yellow I believe you should be able to pick up new cores easily got mine off eBay cheep chris 

On Thu, 5 Apr 2018, 08:48 , <jaeinsf@...> wrote:
Hi,

I recently received a BiTX40 (thanks to the people who helped me with finding the manual).  While going through the various topics here, I was taking a closer look at the board and noticed L2 and L3 are cracked.  I noticed someone had answered another question about parts and suggested, http://www.partsandkits.com but I do not know enough of the part, besides it being 6uH based on the schematic, to be able to order a replacement.  Would someone be kind enough to let me know the part number and the specs for the part for my education.

Thanks!



Re: Another uBitx Add-on PCB.

Nick VK4PP
 

Board complete:
:

Re: Another uBitx Add-on PCB.

Nick VK4PP
 

To my ear the lm324 gave a better result than the TLC274...

I'll start posting out the boards.
73...

Re: Another uBitx Add-on PCB.

Nick VK4PP
 

Ok, some results:

Re: #ubitx SSM2167 mic compressor speaker feedback issue - resolved #ubitx

Nigel G4ZAL
 

Great info - thanks.
My SSM2167 module has just landed from the slow boat...

Nigel.

Re: uBITX BAT54SL: diode ring mixer direction question

MVS Sarma
 

you need to select BAT54S  the one with suffixx "S"  it is two diodes in series.
 two such wired peoperly work as ring modulator. All the best
regards
sarma
 vu3zmv

Regards
MVS Sarma
 

On Thu, Apr 5, 2018 at 3:02 PM, Mike <msmith@...> wrote:
Not to confuse things, but the BAT54 comes in several different pin configurations:


#ubitx SSM2167 mic compressor speaker feedback issue - resolved #ubitx

John <passionfruit88@...>
 

I thought I would mention this as it could be helpful to someone.

In another thread there was the mention that inserting an SSM2167 mic compressor circuit between the microphone and the uBitx mic-preamp would create some feedback when the microphone was placed near the speaker while in Rx.

The solution I applied was to connect the shutdown pin of the SSM2167 (pin 3) to the Raduino T/R digital output (D7) through a 47KOhms resistor. This disables the chip while in RX and removed the mic feedback issue.

Thanks Simon, VK3ELH for pointing out that issue. 

73, John (VK2ETA)

Picture below of where I picked up the pin 3 on the SSM2167 on my module. The purple wire is connected to what is the right hand side of the R4 resistor on my picture. The 4.7KOhms resistor on the RHS is for the mic-bias and the 51KOhms on the top-left is for bringing the compression ratio towards 4.



Re: uBITX BAT54SL: diode ring mixer direction question

Mike
 

Not to confuse things, but the BAT54 comes in several different pin configurations:

Re: BITX40 - L2 and L3 #bitx40 #bitx40help

MVS Sarma
 

However, a broken toroid after having calibrated a coil, If glue repaird, would change its value. Perhaps the inductor value woudl reduce silghtly.  After the suggested gluing, I would recommend to peak the filter for performance.

Regards
MVS Sarma
 

On Thu, Apr 5, 2018 at 2:25 PM, Gordon Gibby <ggibby@...> wrote:
A bit of 5 min epoxy to hold them together tightly is all I would do.  

Just bits of metal suspended in ceramic/resin. 




On Apr 5, 2018, at 04:22, chris gress <Chrisg0wfh@...> wrote:

The cores for L1/L2 are T30-6 the copper wire is 40 turns I am not show of the wire swg the cores are yellow I believe you should be able to pick up new cores easily got mine off eBay cheep chris 

On Thu, 5 Apr 2018, 08:48 , <jaeinsf@...> wrote:
Hi,

I recently received a BiTX40 (thanks to the people who helped me with finding the manual).  While going through the various topics here, I was taking a closer look at the board and noticed L2 and L3 are cracked.  I noticed someone had answered another question about parts and suggested, http://www.partsandkits.com but I do not know enough of the part, besides it being 6uH based on the schematic, to be able to order a replacement.  Would someone be kind enough to let me know the part number and the specs for the part for my education.

Thanks!