WMVX 1570

Mark Connelly markwa1ion@aol.com
Sun Dec 20 22:59:17 EST 2015

Looking at the relocated-to-Andover WMVX engineering report Figure 1, it appears that I am just east (= inside) of the 0.5 mV/m line where it crosses the mid-Cape (bisecting Sandy Neck).  So that puts me around 0.6 mV/m give or take a bit.

This shows an approximate 20 dB loss in comparison to the present signal of 5.96 mV/m (the average of v-soft.com values of 4.39 (zip 02664), 7.56 (zip 02675), and 5.94 (zip 02660) - each of those post offices is about 2.5 miles / 4 km away, one SSW, one WNW, one E).  Radio-Locator map for present (Beverly) WMVX ( http://radio-locator.com/cgi-bin/patg?id=WMVX-AM&s=C&h=D ) shows the mid-Cape well inside the "local" 2.5 mV/m (red) contour so approximately 6 mV/m does sound about right for what 1570 is delivering here during the day. 

Signal loss out around P-Town with the relocation would be somewhat less.

It will be interesting to see how this pans out.  The Perseus SDR receiver I use has very accurate dBm-at-50-ohm-input measurement capability.  I have stored spectrum captures (allowing complete AM band playback, 1 GB file size = approx. 2 min.) done during midday conditions to evaluate antennas being tested.  Besides the 1570 change measured versus the pre-move signal (when using the same antenna), the differences versus other stations similar in frequency, bearing, and distance would give a good metric.  For instance, if WMEX 1510 is 18-20 dB weaker than Beverly WMVX here (pretty close to the right number), I would expect that Andover WMVX would come in here pretty much at the same level as WMEX rather than 'blastingly' louder as at present.

I would suspect that the post-move night WMVX signal will be buried by the metro-Montreal station over 95% of the time.

Mark Connelly, WA1ION
South Yarmouth, MA
(GC= 41.6931 N / 70.1912 W)

-----Original Message-----
To: boston-radio-interest <boston-radio-interest@lists.BostonRadio.org>; markwa1ion <markwa1ion@aol.com>
Sent: Sun, Dec 20, 2015 8:00 pm
Subject: Re: WMVX 1570

Here is the engineering report. 

In a message dated 12/19/2015 12:00:22 P.M. Eastern Standard Time, boston-radio-interest-request@lists.BostonRadio.org writes:
>>Apparently this involves moving from the present site in   Beverly, MA (Endicott College) to the WNNW 800 stick in Andover just NE of the   I-93 / I-495 junction.<<<

More information about the Boston-Radio-Interest mailing list