Date   
Re: high pitched wine on 80 and 40 M

Ian Reeve
 

The original thread is elsewhere but the symptoms disappear when the rig is run from a 12v battery.This points to power supply issues and may be worth a try.I have a uBITX and power it from a gel battery and test have proved that some 12v wall wart power supplies are troublesome with high frequency emissions which are then picked up by the circuitry


From: BITX20@groups.io <BITX20@groups.io> on behalf of jfein2000 via Groups.Io <jfein2000@...>
Sent: Monday, August 26, 2019 7:36:19 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: [BITX20] high pitched wine on 80 and 40 M
 
Hi tried to search for this issue on the forum but without success.  My microbitx works on all bands, transmit and receive but I experience a high pitched wine on 80 and 40 meters.  It isn't present on 20 meters or on 160 meters for that matter.  Any suggestions would be much appreciated.  Thanks Jeff
 

 

 

Re: Apartment antenna question for uBitx #ubitx

ashok.das81@...
 

Dear Curt & G1DF,

Can I get some good literature on FD3 and Horizontal loop antenna, a quick search on internet did not come up with any good resource.

Regards
Ashok

high pitched wine on 80 and 40 M

jfein2000@...
 

Hi tried to search for this issue on the forum but without success.  My microbitx works on all bands, transmit and receive but I experience a high pitched wine on 80 and 40 meters.  It isn't present on 20 meters or on 160 meters for that matter.  Any suggestions would be much appreciated.  Thanks Jeff
 

 

 

Re: Apartment antenna question for uBitx #ubitx

ashok.das81@...
 

Wow, that's so many ideas, thanks all nice people

I will try to study and understand each of these and come back to you if I need any more support. I will work QRP, my rig is uBitx.

Regards
Ashok

Re: Apartment antenna question for uBitx #ubitx

Jack, W8TEE
 

 I would even consider using a ML that didn't have remote tuning. Body capacitance can change things significantly and tuning with a stick is cumbersome at best. Also, the efficiency of a small single loop is not that great.

Jack, W8TEE


On Sunday, August 25, 2019, 4:42:12 PM EDT, Curt via Groups.Io <wb8yyy@...> wrote:


I entirely concur with Gordon. Stay with wire as originally configured, while I have worked a few using those small magnetic loops they require heroic acts to copy cw from. Touching the wire is the greater hazard at 5 or 10 watts, fortunately no one seems to be over 8 or 9 feet tall. Ashok please report back or email any of us as required.

Curt wb8yyy

Re: Current v5 ubitx fixes adequate? Is there a thread about v4 fixes?

Gordon Gibby <ggibby@...>
 

The QST report suggested that the version five was just within specs 

My measurements for the daughterboard have already been published here and it was way way way within specs—version 3. 

Anybody is free to take the Gerbers and produce a kit with those.  Or just sell the boards!  I’ll be happy to give you all the rights  you need. If anybody is willing to do it, I would probably be willing to even re-design it to use the cheaper relays that have the opposite polarity coil.   If a few bucks matters anyway.

The external relay board will not fix the spurs of course, but it sure destroys the harmonics.  And most of my operating is on the lower bands anyway. 

Fascinating little rig, I will be buying one of the version five soon, i used my version three in our fantastically successful extra class course just recently and for the first time people got to see every signal inside of a superheterodyne receiver 

When I spun the VFO back-and-forth they finally begin to understand how tuning occurs on a receiver— watching the signal on the spectrum analyzer. 





On Aug 25, 2019, at 20:36, ajparent1/KB1GMX <kb1gmx@...> wrote:

Its not personality it is a measured thing nor a red herring.  

The question is V5 fixed,  it has the relay fix and generally seems a bit better
with more of them seemingly behaving better with IF fixes.

V4 only fixed the audio amp supplier issues and helped some with pop on tx/rx.

And there are likely many threads on V4 .

Allison

Re: Apartment antenna question for uBitx #ubitx

Jack, W8TEE
 

The construction of the Luggable Double-Double (it's sorta portable) is the subject of Chapter 17 in our new book and Chapter 18 is on the remote control unit. Both are Open Source and there will be a PCB available for the remote unit. We have tested it pretty extensively (Field Day and reverse beacon) and it works pretty well. It works on 40, 30, and 20 meters and we can get down to 1.1:1.0 on all bands and efficiency on 40M is a little over 40%. It's double that on 20M. No need for a kit as the tubing and parts are available at Lowes and the electronics is all common stuff.

Jack, W8TEE



On Sunday, August 25, 2019, 8:22:12 PM EDT, John Faivre <wa9sgd@...> wrote:


That looks great Jack. Are you going to sell a kit?
--
John Faivre WA9SGD

Re: Current v5 ubitx fixes adequate? Is there a thread about v4 fixes?

ajparent1/kb1gmx
 

Its not personality it is a measured thing nor a red herring.  

The question is V5 fixed,  it has the relay fix and generally seems a bit better
with more of them seemingly behaving better with IF fixes.

V4 only fixed the audio amp supplier issues and helped some with pop on tx/rx.

And there are likely many threads on V4 .

Allison

Re: Aircraft headset speaker impedance and ubitx #ubitx

ajparent1/kb1gmx
 

All my Aircraft headset are 600 ohm nominal for speaker and mic.
[include DC, Plantronics, and Telex]

They should work fine. for RX audio and note some are Electret
or dynamic and the levels can be very different.

Allison

Re: Apartment antenna question for uBitx #ubitx

John Faivre
 

That looks great Jack. Are you going to sell a kit?
--
John Faivre WA9SGD

Re: Where many of the ICs we still use today were born.

Dexter N Muir
 

As the Ft-227R came to NZ I bought one (had to get ot re-xtalled from 700kHz split - and they used the wrong spec xtals ).
Aside from thacontant kHz or so off-centre, it was fine for the FM, but I lamented the lack of scanning. Fortunately, later on I worked at Tait, production-line tester (and supervisor) for T196/198s. The pick-and-place rarely got things wrong, but faults often resulted in removal and replacement of (among others) the 4011 quad-NAND IC, perfectly functional but now second-hand.

I designed a scanner using these (with a hex-Inverter ;) 6xNOT 4069 gate). This was as LSI was being developed, all was logic-gates: the development path of RTL->DTL->TTL> CMOS - and in among those, MML. What? MML? Yes, Mickey-Mouse L0gic: using stuff to do what it was not designed for, e.g.NOTs for a clock-oscillator.



The switches were a bank of push-buttons (input selectors) from a home stereo, with one modified to release all others.

It worked well, but was clumsy - and activity was not enough to warrant its use. Not much different today here in ZL. :(

Re: Apartment antenna question for uBitx #ubitx

Curt
 

I entirely concur with Gordon. Stay with wire as originally configured, while I have worked a few using those small magnetic loops they require heroic acts to copy cw from. Touching the wire is the greater hazard at 5 or 10 watts, fortunately no one seems to be over 8 or 9 feet tall. Ashok please report back or email any of us as required.

Curt wb8yyy

Re: Apartment antenna question for uBitx #ubitx

Gordon Gibby <ggibby@...>
 

For my two cents, you guys are hilariously overthinking this.   Put the longest where are you can put up, find some dadgum way to match it  and get some watts going into it.   Go look at the allowable distance from an HF antenna running up to two or 300 W and you’ll find for HF it is measured in inches and feet.   

If you’re going to run QRP, you want the most efficient antenna you can think of, and everybody knows what that is.   

Let the poor guy start having fun with ham radio


On Aug 25, 2019, at 14:33, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

Ken:

Won't just about any antenna suffer from noise from an AC unit and other sources. We've been experimenting with this unit:

<Figure 1 Alt01_.jpg>

and find it to be pretty quiet, as are most loops. This loop is remote controlled and only 3' in diameter. There are a lot of small commercially available loops that could be kept in the apartment and tuned by hand or by remote.

Jack, W8TEE

On Sunday, August 25, 2019, 2:09:59 PM EDT, Ken Hansen <ken@...> wrote:


With loop antennas you want to keep possible noise sources outside of the loop, a roof mounted loop might pick up tremendous noise from roof mounted A/C, etc.

On the the other hand, the highest-energy points on this antenna will be at the ends, which you've drawn within arms reach of anyone near the ground.

Every antenna is a compromise, I just wanted to add that information into your decision process as you choose your compromises.

Remember, the worst antenna is the one that stays in the box, any deployed antenna is better than that!

Quick thought, what about putting a 20/40 meter fan dipole across the roof of the apartment building?Possibly consider a rotatable dipole, even if mounted static/stationary. Something that only requires one mounting point, is self-supporting, and could cover several bands.

Ken, N2VIP

> On Aug 25, 2019, at 12:27 PM, G1WDF <wobblyandflo@...> wrote:
>
> Why not consider a horizontal loop above the building. Less visual impact, and keeping the ends of the AERIAL away from your nieghbours flats and passing pedestrians.



<Figure 1 Alt01_.jpg>

Re: Apartment antenna question for uBitx #ubitx

Jack, W8TEE
 

Ken:

Won't just about any antenna suffer from noise from an AC unit and other sources. We've been experimenting with this unit:

Inline image

and find it to be pretty quiet, as are most loops. This loop is remote controlled and only 3' in diameter. There are a lot of small commercially available loops that could be kept in the apartment and tuned by hand or by remote.

Jack, W8TEE

On Sunday, August 25, 2019, 2:09:59 PM EDT, Ken Hansen <ken@...> wrote:


With loop antennas you want to keep possible noise sources outside of the loop, a roof mounted loop might pick up tremendous noise from roof mounted A/C, etc.

On the the other hand, the highest-energy points on this antenna will be at the ends, which you've drawn within arms reach of anyone near the ground.

Every antenna is a compromise, I just wanted to add that information into your decision process as you choose your compromises.

Remember, the worst antenna is the one that stays in the box, any deployed antenna is better than that!

Quick thought, what about putting a 20/40 meter fan dipole across the roof of the apartment building?Possibly consider a rotatable dipole, even if mounted static/stationary. Something that only requires one mounting point, is self-supporting, and could cover several bands.

Ken, N2VIP

> On Aug 25, 2019, at 12:27 PM, G1WDF <wobblyandflo@...> wrote:
>
> Why not consider a horizontal loop above the building. Less visual impact, and keeping the ends of the AERIAL away from your nieghbours flats and passing pedestrians.



Re: Apartment antenna question for uBitx #ubitx

Curt
 

The first reason for shortening is the classic length equals 468 divided by frequency, yes Ashok gave dimensions in feet. Second reason I forgot to type, it keeps the lowest part of wire 9 feet above the ground. Interesting point by Gordon on what if much of building is metal,  maybe its not.

When center fed, peak current tends to be near center, with voltage peaking at the ends in case of a half wave dipole. Not fun to touch any place at100 watts.

Occupied building best to use a qrp when radiation is close to people, and their electronics.

Curt

Re: Apartment antenna question for uBitx #ubitx

Ken Hansen
 

With loop antennas you want to keep possible noise sources outside of the loop, a roof mounted loop might pick up tremendous noise from roof mounted A/C, etc.

On the the other hand, the highest-energy points on this antenna will be at the ends, which you've drawn within arms reach of anyone near the ground.

Every antenna is a compromise, I just wanted to add that information into your decision process as you choose your compromises.

Remember, the worst antenna is the one that stays in the box, any deployed antenna is better than that!

Quick thought, what about putting a 20/40 meter fan dipole across the roof of the apartment building?Possibly consider a rotatable dipole, even if mounted static/stationary. Something that only requires one mounting point, is self-supporting, and could cover several bands.

Ken, N2VIP

On Aug 25, 2019, at 12:27 PM, G1WDF <@wobbly> wrote:

Why not consider a horizontal loop above the building. Less visual impact, and keeping the ends of the AERIAL away from your nieghbours flats and passing pedestrians.

Re: Apartment antenna question for uBitx #ubitx

bobolink
 

I’m no antenna expert but my guess is that the max radiation will be at right angles to the plane of the wire. Are those good directions to the stations you want to reach?

Re: Apartment antenna question for uBitx #ubitx

Jack, W8TEE
 

How about a mag loop?

Jack, W8TEE

On Sunday, August 25, 2019, 1:28:00 PM EDT, G1WDF <wobblyandflo@...> wrote:


Why not consider a horizontal loop above the building. Less visual impact, and keeping the ends of the AERIAL away from your nieghbours flats and passing pedestrians.

Good luck.

Re: Apartment antenna question for uBitx #ubitx

G1WDF
 

Why not consider a horizontal loop above the building. Less visual impact, and keeping the ends of the AERIAL away from your nieghbours flats and passing pedestrians.

Good luck.

Re: Aircraft headset speaker impedance and ubitx #ubitx

Gordon Gibby <ggibby@...>
 

Use  clip leads or simple wires to try it out


On Aug 25, 2019, at 12:20, "adrien.grelet@..." <adrien.grelet@...> wrote:

On Sun, Aug 25, 2019 at 02:21 PM, Gordon Gibby wrote:
Give it a try! The higher impedance of the earphones will probably not bother you at all, if anything the audio level may be lower but that’s easy to deal with.  
 


 

On Aug 25, 2019, at 02:53, "adrien.grelet@..." <adrien.grelet@...> wrote:

OK I've the confirmation here : https://sennheiserusa.happyfox.com/kb/article/51-pj068-microphone-plug/

The 6.35mm jack is well for the headset. 

 It's very hard to find jack adapter from 5.23mm to 3.5mm (mic).

I've ordered a 6.35mm to 3.5mm to test the headset only for now on the supplied jack connectors.

Stay tuned for results!