[AK-VHF] Fwd: [PNWVHFS] January VHF logs

[Edward R Cole]

  A little sidenote on the VHF Contest:

Chris - WL7CLA and KL7UW made a 6m digital contact over a 65.6 Mile 
path.  Signals were strong with Chris seeing my signal at -18 dB and 
my seeing Chris at -15 dB.  SSB was attempted with my hearing 
absolutely no signal from Chris so was nice to see strong digital 
signals.  I could barely make out some of the JT65 tones in my speaker,

JT65 signal strength indicator reads the SNR level based on a 
bandwidth of 2.5 KHz (typical for SSB).  But the JT65 sw reduces 
detector bandwidth to about 5-Hz which represents a SNR improvement 
of 10Log (2500/5) or 27-dB.  So a -15 dB signal would be barely 
detectable with a 500 Hz CW filter which improves SNR by 
10Log(2500/500) = 7 dB.  CW SNR would be about - 8 dB.

One of the reasons signals were so weak was due to Chris running only 
a 6m dipole and my using a 3 element yagi pointed toward 130 degrees 
(whereas Anchorage is 55 degrees).  My yagi is only 20-foot up on 
side of a tower fixed in this direction (looking at West Coast for 
openings).  So the gain 75 degrees offpoint is probably down a whole 
lot (-15 dB or more) so the antenna actually has negative gain in 
direction of Anchorage.

Later in the day an attempt on 6m to/from KL6M was also undetectable on SSB.

Just shows what digital modes make possible where CW/SSB are non-existent.

73, Ed - KL7UW


At 10:49 AM 1/21/2018, Edward R Cole wrote:
>Forward from our sister VHF organization to the south about deadline 
>for contest logs.  If by e-mail it would be 6:59pm Alaska time on 
>Friday Jan. 26 or in the regular mail for written logs by Jan. 26.
>
>I hope many of you submit logs as there is a Section Award for the 
>contest (which I have collected several years mainly because no one 
>else from AK sent in logs).  Be sure to mark your log with Alaska 
>VHF Up Group so we can get club recognition in the contest.
>http://www.qsl.net/a/ak-vhf//Contests/
>
>there is a link to a Cabrillo log maker for those submitting via e-mail.
>
>I made 14 contacts on four bands 50-432, so probably some of you in 
>Anchorage have done better.
>
>Contest is not over until 6:59pm, today.
>I am monitoring
>144.200
>146.52
>223.50
>and can activate either 432.200 or 446.00
>
>>Just a reminder...new rules require logs to be submitted by 0359Z 
>>January 27...that's 7:59 PM PST on Friday the 26th. Friday postmark 
>>required for paper logs. Only 5 days allowed now.
>>
>>GL and 73, Chuck N6KW
>>
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>73, Ed - KL7UW
>   http://www.kl7uw.com
>Dubus-NA Business mail:
>   dubususa at gmail.com 
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com