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[K3] Birdies

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John Bekema

[K3] Birdies

Hello group!

I'd like to know how many birdies (fast moving) you can normally see on your P3
when the bands are quiet, or no antenna is connected.

I made a screenshot of the P3, tuned on 10m, which is at the moment
pretty dead.

http://www.oh2gba.eu/10mBirdies.png

Is this 'normal' ? I have the feeling that the birdies got worse after
installing the subrx.

Thank you for your comments!

Kind regards,

John de OH2GBA
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ke9uw

Re: [K3] Birdies

I didn't see any while centered on 28.300 MHz.

Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224

________________________________________
From: [hidden email] [[hidden email]] on behalf of John Bekema [[hidden email]]
Sent: Tuesday, May 22, 2012 11:30 AM
To: Elecraft Reflector
Subject: [Elecraft] [K3] Birdies

Hello group!

I'd like to know how many birdies (fast moving) you can normally see on your P3
when the bands are quiet, or no antenna is connected.

I made a screenshot of the P3, tuned on 10m, which is at the moment
pretty dead.

http://www.oh2gba.eu/10mBirdies.png

Is this 'normal' ? I have the feeling that the birdies got worse after
installing the subrx.

Thank you for your comments!

Kind regards,

John de OH2GBA
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Chuck, KE9UW

Geoffrey Mackenzie-Kennedy-3

Re: [K3] Birdies

In reply to this post by John Bekema

Hello John,

Because I see that the birdies are spaced approximately 13.5 kHz apart,
leads me to ask whether you are using a linear or a switching type of power
supply.

Second question, do you still see these birdies at the bottom edge of the
10m band?

73,
Geoff
LX2AO

On May 22, 2012 at 6:30 PM, John Bekema wrote:

> Hello group!
>
> I'd like to know how many birdies (fast moving) you can normally see on
> your P3
> when the bands are quiet, or no antenna is connected.
>
> I made a screenshot of the P3, tuned on 10m, which is at the moment
> pretty dead.
>
> http://www.oh2gba.eu/10mBirdies.png
>
> Is this 'normal' ? I have the feeling that the birdies got worse after
> installing the subrx.
>
>
> Thank you for your comments!
>
>
> Kind regards,
>
> John de OH2GBA

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John Bekema

Re: [K3] Birdies

Hello Geoff!

I am using a linear power supply. On the lower end of the 10m band,
the birdies are a bit less.

On six meters, the birdies are stronger, for example on 50.09374 is an
S8 birdy. But the funny thing is, when listening
to the subreceiver to the same freq, with the same settings, the birdy
is much less noticable. It barely moves the meter.

Also when listening with one ear to the main rx and the other ear to
the sub rx while slowly tuning, I can hear on the main
receiver 'whooop whoop whooop' while nothing is heard on the
subreceiver. (receivers linked)

Ideas?

John

2012/5/22 Geoffrey Mackenzie-Kennedy <[hidden email]>:

> Hello John,
>
> Because I see that the birdies are spaced approximately 13.5 kHz apart,
> leads me to ask whether you are using a linear or a switching type of power
> supply.
>
> Second question, do you still see these birdies at the bottom edge of the
> 10m band?
>
> 73,
> Geoff
> LX2AO
>
>
>
> On May 22, 2012 at 6:30 PM, John Bekema wrote:
>
>
>> Hello group!
>>
>> I'd like to know how many birdies (fast moving) you can normally see on
>> your P3
>> when the bands are quiet, or no antenna is connected.
>>
>> I made a screenshot of the P3, tuned on 10m, which is at the moment
>> pretty dead.
>>
>> http://www.oh2gba.eu/10mBirdies.png
>>
>> Is this 'normal' ? I have the feeling that the birdies got worse after
>> installing the subrx.
>>
>>
>> Thank you for your comments!
>>
>>
>> Kind regards,
>>
>> John de OH2GBA
>
>

--
Regards,
John Bekema
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ve3dvy

Re: [K3] Birdies

In reply to this post by John Bekema

do you have WiFi

my dlink router is throwing birdies big time and its still there when
the antenna is disconnected. havn't checked the spacing but that
seems about correct. They are most noticable on 15-10m havn't tried
6m. one birdie sits right on a local 10m net frequency so when the
net's on the internet is off and router unplugged, much to the
grumbling of the rest of the family. the band seems clean when the
router is unplugged.

David Moes
VE3DVY

>
> --- Original message ---
> Subject: Re: [Elecraft] [K3] Birdies
> From: John Bekema <[hidden email]>
> To: Geoffrey Mackenzie-Kennedy <[hidden email]>
> Cc: Elecraft Discussion List <[hidden email]>
> Date: Tuesday, 22/05/2012 1:54 PM
>
> Hello Geoff!
>
> I am using a linear power supply. On the lower end of the 10m band,
> the birdies are a bit less.
>
> On six meters, the birdies are stronger, for example on 50.09374 is an
> S8 birdy. But the funny thing is, when listening
> to the subreceiver to the same freq, with the same settings, the birdy
> is much less noticable. It barely moves the meter.
>
> Also when listening with one ear to the main rx and the other ear to
> the sub rx while slowly tuning, I can hear on the main
> receiver 'whooop whoop whooop' while nothing is heard on the
> subreceiver. (receivers linked)
>
> Ideas?
>
> John
>
>
> 2012/5/22 Geoffrey Mackenzie-Kennedy <[hidden email]>:
>>
>> Hello John,
>>
>> Because I see that the birdies are spaced approximately 13.5 kHz
>> apart,
>> leads me to ask whether you are using a linear or a switching type of
>> power
>> supply.
>>
>> Second question, do you still see these birdies at the bottom edge of
>> the
>> 10m band?
>>
>> 73,
>> Geoff
>> LX2AO
>>
>>
>>
>> On May 22, 2012 at 6:30 PM, John Bekema wrote:
>>
>>
>>>
>>> Hello group!
>>>
>>> I'd like to know how many birdies (fast moving) you can normally see
>>> on
>>> your P3
>>> when the bands are quiet, or no antenna is connected.
>>>
>>> I made a screenshot of the P3, tuned on 10m, which is at the moment
>>> pretty dead.
>>>
>>> http://www.oh2gba.eu/10mBirdies.png
>>>
>>> Is this 'normal' ? I have the feeling that the birdies got worse after
>>> installing the subrx.
>>>
>>>
>>> Thank you for your comments!
>>>
>>>
>>> Kind regards,
>>>
>>> John de OH2GBA
>>
>>
>
>
>
> --
> Regards,
> John Bekema
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Tony Estep

Re: [K3] Birdies

On Tue, May 22, 2012 at 1:08 PM, <[hidden email]> wrote:

> ...my dlink router is throwing birdies big time...

==============
I have encountered this same problem with all the wifi routers I've tried.
My solution has three parts: I put the router as far away from the shack as
feasible while still getting good wifi connectivity; I shortened all the
cables and wires connecting to the router as much as possible; and I
festooned those cables and wires with ferrites. Note that if you have a
cable modem, the router may radiate junk back into your house's tv-cable
wiring, and birdies can get into the shack via that route. Anyway, once you
realize the problem and know where the birdies are, you can attack it and
with some patience, you can attenuate most or even all of them below the
level of audibility.

Tony KT0NY

--
http://www.isb.edu/faculty/facultydir.aspx?ddlFaculty=352
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John Bekema

Re: [K3] Birdies

In reply to this post by ve3dvy

I am not sure if this is related to any wifi/switching power supply

Check an other picture:
http://www.oh2gba.eu/10mBirdies2.png

The P3 is in 'Fixed tune mode' (so when you turn the dial, the green
bar will move)
You see that the 'birdies' move, quickly. At 50.024 you see a CW beacon.

When removing the antenna, the 'birdies' stay.

John

2012/5/22 <[hidden email]>:

> do you have WiFi
>
> my dlink router is throwing birdies big time and its still there when
> the antenna is disconnected. havn't checked the spacing but that
> seems about correct. They are most noticable on 15-10m havn't tried
> 6m. one birdie sits right on a local 10m net frequency so when the
> net's on the internet is off and router unplugged, much to the
> grumbling of the rest of the family. the band seems clean when the
> router is unplugged.
>
>
>
> David Moes
> VE3DVY
>
>
>>
>> --- Original message ---
>> Subject: Re: [Elecraft] [K3] Birdies
>> From: John Bekema <[hidden email]>
>> To: Geoffrey Mackenzie-Kennedy <[hidden email]>
>> Cc: Elecraft Discussion List <[hidden email]>
>> Date: Tuesday, 22/05/2012 1:54 PM
>>
>> Hello Geoff!
>>
>> I am using a linear power supply. On the lower end of the 10m band,
>> the birdies are a bit less.
>>
>> On six meters, the birdies are stronger, for example on 50.09374 is an
>> S8 birdy. But the funny thing is, when listening
>> to the subreceiver to the same freq, with the same settings, the birdy
>> is much less noticable. It barely moves the meter.
>>
>> Also when listening with one ear to the main rx and the other ear to
>> the sub rx while slowly tuning, I can hear on the main
>> receiver 'whooop whoop whooop' while nothing is heard on the
>> subreceiver. (receivers linked)
>>
>> Ideas?
>>
>> John
>>
>>
>> 2012/5/22 Geoffrey Mackenzie-Kennedy <[hidden email]>:
>>>
>>> Hello John,
>>>
>>> Because I see that the birdies are spaced approximately 13.5 kHz
>>> apart,
>>> leads me to ask whether you are using a linear or a switching type of
>>> power
>>> supply.
>>>
>>> Second question, do you still see these birdies at the bottom edge of
>>> the
>>> 10m band?
>>>
>>> 73,
>>> Geoff
>>> LX2AO
>>>
>>>
>>>
>>> On May 22, 2012 at 6:30 PM, John Bekema wrote:
>>>
>>>
>>>>
>>>> Hello group!
>>>>
>>>> I'd like to know how many birdies (fast moving) you can normally see
>>>> on
>>>> your P3
>>>> when the bands are quiet, or no antenna is connected.
>>>>
>>>> I made a screenshot of the P3, tuned on 10m, which is at the moment
>>>> pretty dead.
>>>>
>>>> http://www.oh2gba.eu/10mBirdies.png
>>>>
>>>> Is this 'normal' ? I have the feeling that the birdies got worse after
>>>> installing the subrx.
>>>>
>>>>
>>>> Thank you for your comments!
>>>>
>>>>
>>>> Kind regards,
>>>>
>>>> John de OH2GBA
>>>
>>>
>>
>>
>>
>> --
>> Regards,
>> John Bekema
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

ve3dvy

Re: [K3] Birdies

In reply to this post by John Bekema

hmm wierd another source in our home for birdies is the
front loading washer, its another badie Its motor is some kind of DC
servo or VF-AC. With the variation that you are seeing It may be
something with a motor. It tends to be problematic on 80 and 40.
and I believe they are moving, i dont have the p3 so I cant say for
sure but it seems so when I see it in the puny view that EasyPal
offers.

David Moes
VE3DVY

>
> --- Original message ---
> Subject: Re: [Elecraft] [K3] Birdies
> From: John Bekema <[hidden email]>
> To: <[hidden email]>
> Cc: <[hidden email]>
> Date: Tuesday, 22/05/2012 2:30 PM
>
> I am not sure if this is related to any wifi/switching power supply
>
> Check an other picture:
> http://www.oh2gba.eu/10mBirdies2.png
>
> The P3 is in 'Fixed tune mode' (so when you turn the dial, the green
> bar will move)
> You see that the 'birdies' move, quickly. At 50.024 you see a CW
> beacon.
>
> When removing the antenna, the 'birdies' stay.
>
> John
>
> 2012/5/22 <[hidden email]>:
>>
>> do you have WiFi
>>
>> my dlink router is throwing birdies big time and its still there when
>> the antenna is disconnected. havn't checked the spacing but that
>> seems about correct. They are most noticable on 15-10m havn't tried
>> 6m. one birdie sits right on a local 10m net frequency so when the
>> net's on the internet is off and router unplugged, much to the
>> grumbling of the rest of the family. the band seems clean when the
>> router is unplugged.
>>
>>
>>
>> David Moes
>> VE3DVY
>>
>>
>>>
>>>
>>> --- Original message ---
>>> Subject: Re: [Elecraft] [K3] Birdies
>>> From: John Bekema <[hidden email]>
>>> To: Geoffrey Mackenzie-Kennedy <[hidden email]>
>>> Cc: Elecraft Discussion List <[hidden email]>
>>> Date: Tuesday, 22/05/2012 1:54 PM
>>>
>>> Hello Geoff!
>>>
>>> I am using a linear power supply. On the lower end of the 10m band,
>>> the birdies are a bit less.
>>>
>>> On six meters, the birdies are stronger, for example on 50.09374 is an
>>> S8 birdy. But the funny thing is, when listening
>>> to the subreceiver to the same freq, with the same settings, the birdy
>>> is much less noticable. It barely moves the meter.
>>>
>>> Also when listening with one ear to the main rx and the other ear to
>>> the sub rx while slowly tuning, I can hear on the main
>>> receiver 'whooop whoop whooop' while nothing is heard on the
>>> subreceiver. (receivers linked)
>>>
>>> Ideas?
>>>
>>> John
>>>
>>>
>>> 2012/5/22 Geoffrey Mackenzie-Kennedy <[hidden email]>:
>>>>
>>>>
>>>> Hello John,
>>>>
>>>> Because I see that the birdies are spaced approximately 13.5 kHz
>>>> apart,
>>>> leads me to ask whether you are using a linear or a switching type of
>>>> power
>>>> supply.
>>>>
>>>> Second question, do you still see these birdies at the bottom edge of
>>>> the
>>>> 10m band?
>>>>
>>>> 73,
>>>> Geoff
>>>> LX2AO
>>>>
>>>>
>>>>
>>>> On May 22, 2012 at 6:30 PM, John Bekema wrote:
>>>>
>>>>
>>>>>
>>>>>
>>>>> Hello group!
>>>>>
>>>>> I'd like to know how many birdies (fast moving) you can normally see
>>>>> on
>>>>> your P3
>>>>> when the bands are quiet, or no antenna is connected.
>>>>>
>>>>> I made a screenshot of the P3, tuned on 10m, which is at the moment
>>>>> pretty dead.
>>>>>
>>>>> http://www.oh2gba.eu/10mBirdies.png
>>>>>
>>>>> Is this 'normal' ? I have the feeling that the birdies got worse after
>>>>> installing the subrx.
>>>>>
>>>>>
>>>>> Thank you for your comments!
>>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>> John de OH2GBA
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Regards,
>>> John Bekema
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> --
> Regards,
> John Bekema

David Gilbert

Re: [K3] Birdies

I don't have a P3, but I do have a K3 and it is no secret to anyone that
it is rife with low level birdies. I also agree with the original post
that the 2nd receiver compounds the problem ... the 2nd receiver is very
well shielded (the main is not) and has almost no birdies, but my own
experiments with cable routing showed that the 2nd receiver contributes
to coupling of signals inside the rig. The SIG RMV menu function added
by Elecraft totally "cured" that problem for me and I now have no
operating complaints at all, but SIG RMV doesn't make the birdies go
away ... it just shifts each of them out of the normal receive
passband. I'm not surprised that they would still show up on a wideband
spectrum display of the main receiver.

If you want to check, take the top off the K3 and move some cables
around (the small coax ones leading to the front panel) while watching
the P3. If the blips change in amplitude you're watching birdies.

73,
Dave AB7E

On 5/22/2012 11:56 AM, [hidden email] wrote:

> hmm wierd another source in our home for birdies is the
> front loading washer, its another badie Its motor is some kind of DC
> servo or VF-AC. With the variation that you are seeing It may be
> something with a motor. It tends to be problematic on 80 and 40.
> and I believe they are moving, i dont have the p3 so I cant say for
> sure but it seems so when I see it in the puny view that EasyPal
> offers.
>
>
>
> David Moes
> VE3DVY
>
>
>> --- Original message ---
>> Subject: Re: [Elecraft] [K3] Birdies
>> From: John Bekema<[hidden email]>
>> To:<[hidden email]>
>> Cc:<[hidden email]>
>> Date: Tuesday, 22/05/2012 2:30 PM
>>
>> I am not sure if this is related to any wifi/switching power supply
>>
>> Check an other picture:
>> http://www.oh2gba.eu/10mBirdies2.png
>>
>> The P3 is in 'Fixed tune mode' (so when you turn the dial, the green
>> bar will move)
>> You see that the 'birdies' move, quickly. At 50.024 you see a CW
>> beacon.
>>
>> When removing the antenna, the 'birdies' stay.
>>
>> John
>>
>> 2012/5/22<[hidden email]>:
>>> do you have WiFi
>>>
>>> my dlink router is throwing birdies big time and its still there when
>>> the antenna is disconnected. havn't checked the spacing but that
>>> seems about correct. They are most noticable on 15-10m havn't tried
>>> 6m. one birdie sits right on a local 10m net frequency so when the
>>> net's on the internet is off and router unplugged, much to the
>>> grumbling of the rest of the family. the band seems clean when the
>>> router is unplugged.
>>>
>>>
>>>
>>> David Moes
>>> VE3DVY
>>>
>>>
>>>>
>>>> --- Original message ---
>>>> Subject: Re: [Elecraft] [K3] Birdies
>>>> From: John Bekema<[hidden email]>
>>>> To: Geoffrey Mackenzie-Kennedy<[hidden email]>
>>>> Cc: Elecraft Discussion List<[hidden email]>
>>>> Date: Tuesday, 22/05/2012 1:54 PM
>>>>
>>>> Hello Geoff!
>>>>
>>>> I am using a linear power supply. On the lower end of the 10m band,
>>>> the birdies are a bit less.
>>>>
>>>> On six meters, the birdies are stronger, for example on 50.09374 is an
>>>> S8 birdy. But the funny thing is, when listening
>>>> to the subreceiver to the same freq, with the same settings, the birdy
>>>> is much less noticable. It barely moves the meter.
>>>>
>>>> Also when listening with one ear to the main rx and the other ear to
>>>> the sub rx while slowly tuning, I can hear on the main
>>>> receiver 'whooop whoop whooop' while nothing is heard on the
>>>> subreceiver. (receivers linked)
>>>>
>>>> Ideas?
>>>>
>>>> John
>>>>
>>>>
>>>> 2012/5/22 Geoffrey Mackenzie-Kennedy<[hidden email]>:
>>>>>
>>>>> Hello John,
>>>>>
>>>>> Because I see that the birdies are spaced approximately 13.5 kHz
>>>>> apart,
>>>>> leads me to ask whether you are using a linear or a switching type of
>>>>> power
>>>>> supply.
>>>>>
>>>>> Second question, do you still see these birdies at the bottom edge of
>>>>> the
>>>>> 10m band?
>>>>>
>>>>> 73,
>>>>> Geoff
>>>>> LX2AO
>>>>>
>>>>>
>>>>>
>>>>> On May 22, 2012 at 6:30 PM, John Bekema wrote:
>>>>>
>>>>>
>>>>>>
>>>>>> Hello group!
>>>>>>
>>>>>> I'd like to know how many birdies (fast moving) you can normally see
>>>>>> on
>>>>>> your P3
>>>>>> when the bands are quiet, or no antenna is connected.
>>>>>>
>>>>>> I made a screenshot of the P3, tuned on 10m, which is at the moment
>>>>>> pretty dead.
>>>>>>
>>>>>> http://www.oh2gba.eu/10mBirdies.png
>>>>>>
>>>>>> Is this 'normal' ? I have the feeling that the birdies got worse after
>>>>>> installing the subrx.
>>>>>>
>>>>>>
>>>>>> Thank you for your comments!
>>>>>>
>>>>>>
>>>>>> Kind regards,
>>>>>>
>>>>>> John de OH2GBA
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>> John Bekema
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[hidden email]
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>> --
>> Regards,
>> John Bekema
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

k6dgw

Re: [K3] Birdies

In reply to this post by John Bekema

On 5/22/2012 9:30 AM, John Bekema wrote:
> I'd like to know how many birdies (fast moving) you can normally see on your P3
> when the bands are quiet, or no antenna is connected.

No fast moving ones. Very few fixed ones, mine come from the
neighborhood wireless RAP at the top of my tower [we get free Internet
:-)] and I know where they are.
>
> I made a screenshot of the P3, tuned on 10m, which is at the moment
> pretty dead.

Your screenshot is fairly strange. Are you sure they're coming from the
K3? I have an early K3 [#642], and when I calibrated the S-meter and
P3, I had to run the transfer gain in the P3 very high, which produced a
bunch of "birdies" on the P3 that I couldn't tune to [they moved with
the receive cursor]. I think they were being generated in the P3. I
did the IF level mod [change one resistor in the K3] and everything is
normal now.

Are they there with no antenna? Does the RF Gain affect them?

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

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K6ADG@arrl.net

Re: [K3] Birdies

In reply to this post by John Bekema

That looks a lot like an electric motor (washing machine) to me eg
amplitude and distibution..........just my experience. Better to look
for horses instead of Zebras :-)

Alan/K6ADG
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Geoffrey Mackenzie-Kennedy-3

Re: [K3] Birdies

In reply to this post by John Bekema

Hello John,

Thank you for your reply, and my apology for not being able to return
sooner.

I am inclined to think that the source of these "birdies" is external to
your K3, and getting into the receiver via some connecting cable(s).

The reason why the birdies are less noticeable on the sub-receiver is
probably because it is in a shielded module, whereas the main receiver is
"open plan". However if there any coax cables or wires entering the sub-
receiver's enclosure through holes in the shield, then whatever is causing
the birdies will get into the sub- receiver. The dimensions of the
sub-receiver's shielded enclosure might also affect the strength of the
sub-receiver's birdies on different bands, especially the higher frequency
bands (the "Waveguide effect").

Will look again at your screen capture, because I think that there is
evidence that the birdies have discrete sidebands, which might help to
identify their source.

73,

Geoff
LX2AO

On May 22, 2012 at 7:53 PM, John Bekema wrote:

> Hello Geoff!
>
> I am using a linear power supply. On the lower end of the 10m band,
> the birdies are a bit less.
>
> On six meters, the birdies are stronger, for example on 50.09374 is an
> S8 birdy. But the funny thing is, when listening
> to the subreceiver to the same freq, with the same settings, the birdy
> is much less noticable. It barely moves the meter.
>
> Also when listening with one ear to the main rx and the other ear to
> the sub rx while slowly tuning, I can hear on the main
> receiver 'whooop whoop whooop' while nothing is heard on the
> subreceiver. (receivers linked)
>
> Ideas?
>
> John