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Phil Wheeler-2

Interesting

http://www.arrl.org/news/fcc-proposes-to-permit-amateur-access-to-2200-and-630-meters

Phil W7OX
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Jim Low man

Re: Interesting

I heard elsewhere that Elecraft is ready for 630m when the FCC gives
final approval.
I know that the K3 will receive on that band, but what will be needed to
be able to transmit there (other than a very long antenna)?

How about the 2200m band? Is the K3 receiver sensitivity good enough,
that low in frequency?

73 de Jim - AD6CW

On 4/28/2015 3:20 PM, Phil Wheeler wrote:
> http://www.arrl.org/news/fcc-proposes-to-permit-amateur-access-to-2200-and-630-meters
>
>
> Phil W7OX

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Phil Hystad-3

Re: Interesting

>
> How about the 2200m band? Is the K3 receiver sensitivity good enough, that low in frequency?
>

I think I remember reading somewhere (in previous e-mail from Elecraft or maybe something Elecraft
has on their web site) that the the K3 sensitivity for 2200 meter band is around -100 dBm which puts
it somewhere between an S4 and S5 on the S-meter. So, strong signals should easily be heard
but who is sending those strong signals — I mean, who will be first?

73, phil, K7PEH

> On Apr 28, 2015, at 5:02 PM, Jim Lowman <[hidden email]> wrote:
>
> I heard elsewhere that Elecraft is ready for 630m when the FCC gives final approval.
> I know that the K3 will receive on that band, but what will be needed to be able to transmit there (other than a very long antenna)?
>
> How about the 2200m band? Is the K3 receiver sensitivity good enough, that low in frequency?
>
> 73 de Jim - AD6CW
>
> On 4/28/2015 3:20 PM, Phil Wheeler wrote:
>> http://www.arrl.org/news/fcc-proposes-to-permit-amateur-access-to-2200-and-630-meters
>>
>> Phil W7OX
>
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k6dgw

Re: Interesting

In reply to this post by Jim Low man

On 4/28/2015 5:02 PM, Jim Lowman wrote:
> I heard elsewhere that Elecraft is ready for 630m when the FCC gives
> final approval.
> I know that the K3 will receive on that band, but what will be needed to
> be able to transmit there (other than a very long antenna)?

Ummm ... don't know. Just because it receives very well down there [with
the KBPF3], TX may require some mods to the filters, HW or FW. I'm
pretty sure it will happen if the FCC ever acts. My K3 receives very
well on 630 m. Most antennas at 630 m are verticals, we will all have
to decide: a) how much can we afford in a tower; and b) what will the
HOA accept as "reasonable accommodation." :-)
>
> How about the 2200m band? Is the K3 receiver sensitivity good enough,
> that low in frequency?

Wayne has already made it clear that MF/LF sensitivity falls off
steadily below 300 KHz. I'm going to keep WSPR running on 137 KHZ for
awhile, but I'm not holding my breath. Sensitivity seems to go down as
stated, noise here rises dramatically. Honestly, I think expecting a
radio to work perfectly from 100 KHz to 50,000 KHz is like asking the
government to never make a misteak.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

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Eric NO3M

Re: Interesting

K3 is ready now I thought... transmits 1mW out of the transverter port
at 630M. At least one of the experimental guys is doing so w/ the new
synths. Only an amplifier is needed, depending on how much power you
want to put out or need to reach the EIRP limit.

Long antenna? Tower? Not necessary. The proposed power limit is 5W
EIRP (or 1W EIRP in parts of AK if within 800km of Russia). As such,
you could in theory put up anything and adjust your transmitter output
to reach the EIRP limit. It levels the playing field for everyone,
whether you have a 10 ft stick, 200ft top-loaded tower, or a phased
array. No one antenna *should* radiate any more power in a given
direction if the EIRP restriction is followed correctly. 67ft
top-loaded vertical + 75-100W output (~5-8W ERP) has gotten me QSOs all
over the US, including CW to the west coast. Work on your RX antenna(s)
before worrying about the TX antenna on LF/MF..... esp with an EIRP limit.

73 Eric NO3M
WG2XJM (Part 5 2200m + 630m)

On 04/28/2015 08:18 PM, Fred Jensen wrote:

> On 4/28/2015 5:02 PM, Jim Lowman wrote:
>> I heard elsewhere that Elecraft is ready for 630m when the FCC gives
>> final approval.
>> I know that the K3 will receive on that band, but what will be needed to
>> be able to transmit there (other than a very long antenna)?
>
> Ummm ... don't know. Just because it receives very well down there
> [with the KBPF3], TX may require some mods to the filters, HW or FW.
> I'm pretty sure it will happen if the FCC ever acts. My K3 receives
> very well on 630 m. Most antennas at 630 m are verticals, we will all
> have to decide: a) how much can we afford in a tower; and b) what will
> the HOA accept as "reasonable accommodation." :-)
>>
>> How about the 2200m band? Is the K3 receiver sensitivity good enough,
>> that low in frequency?
>
> Wayne has already made it clear that MF/LF sensitivity falls off
> steadily below 300 KHz. I'm going to keep WSPR running on 137 KHZ for
> awhile, but I'm not holding my breath. Sensitivity seems to go down
> as stated, noise here rises dramatically. Honestly, I think expecting
> a radio to work perfectly from 100 KHz to 50,000 KHz is like asking
> the government to never make a misteak.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
>

wayne burdick

Re: Interesting

Administrator

On Apr 28, 2015, at 6:46 PM, Eric NO3M <[hidden email]> wrote:

> K3 is ready now I thought... transmits 1mW out of the transverter port at 630M. At least one of the experimental guys is doing so w/ the new synths. Only an amplifier is needed, depending on how much power you want to put out or need to reach the EIRP limit.

Correct. You need the KBPF3 and KXV3 options, and output is somewhere around 0.5-1.0 mW, varying a bit with the radio.

Wayne
N6KR

>
> Long antenna? Tower? Not necessary. The proposed power limit is 5W EIRP (or 1W EIRP in parts of AK if within 800km of Russia). As such, you could in theory put up anything and adjust your transmitter output to reach the EIRP limit. It levels the playing field for everyone, whether you have a 10 ft stick, 200ft top-loaded tower, or a phased array. No one antenna *should* radiate any more power in a given direction if the EIRP restriction is followed correctly. 67ft top-loaded vertical + 75-100W output (~5-8W ERP) has gotten me QSOs all over the US, including CW to the west coast. Work on your RX antenna(s) before worrying about the TX antenna on LF/MF..... esp with an EIRP limit.
>
> 73 Eric NO3M
> WG2XJM (Part 5 2200m + 630m)
>
>
> On 04/28/2015 08:18 PM, Fred Jensen wrote:
>> On 4/28/2015 5:02 PM, Jim Lowman wrote:
>>> I heard elsewhere that Elecraft is ready for 630m when the FCC gives
>>> final approval.
>>> I know that the K3 will receive on that band, but what will be needed to
>>> be able to transmit there (other than a very long antenna)?
>>
>> Ummm ... don't know. Just because it receives very well down there [with the KBPF3], TX may require some mods to the filters, HW or FW. I'm pretty sure it will happen if the FCC ever acts. My K3 receives very well on 630 m. Most antennas at 630 m are verticals, we will all have to decide: a) how much can we afford in a tower; and b) what will the HOA accept as "reasonable accommodation." :-)
>>>
>>> How about the 2200m band? Is the K3 receiver sensitivity good enough,
>>> that low in frequency?
>>
>> Wayne has already made it clear that MF/LF sensitivity falls off steadily below 300 KHz. I'm going to keep WSPR running on 137 KHZ for awhile, but I'm not holding my breath. Sensitivity seems to go down as stated, noise here rises dramatically. Honestly, I think expecting a radio to work perfectly from 100 KHz to 50,000 KHz is like asking the government to never make a misteak.
>>
>> 73,
>>
>> Fred K6DGW
>> - Northern California Contest Club
>> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
>> - www.cqp.org
>>
>
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Fausto Coletti

K3 and 630m band

Hi all,

This is the K3 in qso on 630m band with my 100W PA, driven directly from
the low level output of the K3:

https://www.youtube.com/watch?v=acj2SKy_HxA

this is the power amplifier:

http://it.tinypic.com/r/16j4pab/8

it is a switching mode PA with a single mosfet that can deliver 100W at 12V
and 135W at 13.8V
with an efficiency of about 90%.
Of course it is not linear and can not be used on ssb but in this band is
not allowed ssb at least here in Europe.
It can be obviously be used on CW and all digital mode that use FSK
modulation.

About the question oh harmonic in the MW broadcast band, this is the output
of the amplifier at 135W
(you must add 61 dB of the attenuator at the input of the spectrum
analyzer):

http://it.tinypic.com/r/33c5ieh/8

I do not know if this meets the requirement of the FCC but we have about 1
mW on the second harmonic and
0.02 mW on third and, if we add the selectivity of the antenna (my 25m high
inverted L have a 1.5:1 SWR bandwidth of about 2 KHz),
i think that the emission on the harmonics can not go far.
If you are interested to the amplifier you can contact me at my e-mail
address.

73, Fausto IK4NMF

----- Original Message -----
From: "Wayne Burdick" <[hidden email]>
To: "Eric NO3M" <[hidden email]>
Cc: <[hidden email]>
Sent: Wednesday, April 29, 2015 5:31 AM
Subject: Re: [Elecraft] Interesting

>
> On Apr 28, 2015, at 6:46 PM, Eric NO3M <[hidden email]> wrote:
>
>> K3 is ready now I thought... transmits 1mW out of the transverter port at
>> 630M. At least one of the experimental guys is doing so w/ the new
>> synths. Only an amplifier is needed, depending on how much power you
>> want to put out or need to reach the EIRP limit.
>
> Correct. You need the KBPF3 and KXV3 options, and output is somewhere
> around 0.5-1.0 mW, varying a bit with the radio.
>
> Wayne
> N6KR
>
>
>>
>> Long antenna? Tower? Not necessary. The proposed power limit is 5W EIRP
>> (or 1W EIRP in parts of AK if within 800km of Russia). As such, you
>> could in theory put up anything and adjust your transmitter output to
>> reach the EIRP limit. It levels the playing field for everyone, whether
>> you have a 10 ft stick, 200ft top-loaded tower, or a phased array. No
>> one antenna *should* radiate any more power in a given direction if the
>> EIRP restriction is followed correctly. 67ft top-loaded vertical +
>> 75-100W output (~5-8W ERP) has gotten me QSOs all over the US, including
>> CW to the west coast. Work on your RX antenna(s) before worrying about
>> the TX antenna on LF/MF..... esp with an EIRP limit.
>>
>> 73 Eric NO3M
>> WG2XJM (Part 5 2200m + 630m)
>>
>>
>> On 04/28/2015 08:18 PM, Fred Jensen wrote:
>>> On 4/28/2015 5:02 PM, Jim Lowman wrote:
>>>> I heard elsewhere that Elecraft is ready for 630m when the FCC gives
>>>> final approval.
>>>> I know that the K3 will receive on that band, but what will be needed
>>>> to
>>>> be able to transmit there (other than a very long antenna)?
>>>
>>> Ummm ... don't know. Just because it receives very well down there [with
>>> the KBPF3], TX may require some mods to the filters, HW or FW. I'm
>>> pretty sure it will happen if the FCC ever acts. My K3 receives very
>>> well on 630 m. Most antennas at 630 m are verticals, we will all have
>>> to decide: a) how much can we afford in a tower; and b) what will the
>>> HOA accept as "reasonable accommodation." :-)
>>>>
>>>> How about the 2200m band? Is the K3 receiver sensitivity good enough,
>>>> that low in frequency?
>>>
>>> Wayne has already made it clear that MF/LF sensitivity falls off
>>> steadily below 300 KHz. I'm going to keep WSPR running on 137 KHZ for
>>> awhile, but I'm not holding my breath. Sensitivity seems to go down as
>>> stated, noise here rises dramatically. Honestly, I think expecting a
>>> radio to work perfectly from 100 KHz to 50,000 KHz is like asking the
>>> government to never make a misteak.
>>>
>>> 73,
>>>
>>> Fred K6DGW
>>> - Northern California Contest Club
>>> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
>>> - www.cqp.org
>>>
>>
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
>
> ______________________________________________________________
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>
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