I used theDC 5V DYP-ME007Y Ultrasonic Sensor Module Measuring Range 30cm-3.5m, with the cable and remote head. From Ebay seller bosity.

 I used the first code: Example NewPing library sketch that does a ping about 20 times per second.

 Sensor    5v   -------   5v    Arduino
           Trig -------   Pin 12
           Echo -------   Ping 11
           GND  -------   GND
 I used a Rigol DS2202 Digital Oscilloscope 
 Channel 1 monitoring the Trigger
 Channel 2 monitoring the Echo

 Trigger timing is as following;
-----------|          |-------------------------|                /--------------- 
           |          |                         |              /
           |          |                         |            /
           |          |                         |          /
           ------------                   	----------|
           <5.06us   >                          < 78.4ns >
            34.56mHz                             5.138mHz
 The trigger timing never changed 


 Channel 2 timing is as following:


                           A < For the timing - see chart below cm and inch's    > B 
                           |-------------------------------------------------------|
                           |< width in ms based on cm from Ultrasonic sensor head >|
                           |                                                       |
 start of                  |                                                       |
 Trigger  >                |                                                       |
-----------|---------------|                                                       |---------
            <  210us      >
               1.415Khz
     The 210us never changed


cm,	inch,  Width ms, 1 cycle Period ms, serial montior in cm, Duty cycle
25.4	10	1.6		7.08		27	
30.48	12	1.74		7.25		30	
35.56	14	1.94		7.51		35	
40.64	16	2.3		7.8		40	
45.72	18	2.6		8.1		45	
50.8	20	2.82		8.4		50	
55.88	22	3.2		8.7		55	
60.96	24	3.46		8.96		60	
66.4	26	3.74		9.24		65	
71.12	28	4.06		9.56		71	
76.2	30	4.34		9.85		76	
81.28	32	4.6		10.16		81	              54
86.36	34	4.96		10.44		86	              52.4
91.44	36	5.24		10.72		91	              50.9
95.25	37.5	5.46		11		95	              50 duty cycle for 1 cycle
96.52	38	5.56		11.04		97	              49.6
101.6	40	5.84		11.44		102	              48.6
106.6	42	6.14		11.72		107	              47.4
111.76	44	6.44		12		112	
116.84	46	6.72		12.2		118	
121.92	48	7		12.58		123	
127	50	7.3		12.84		127	
132.08	52	7.6		13.16		133	
137.16	54	7.9		13.44		138	
142.24	56	8.2		13.76		143	
147.32	58	8.5		14		149	
152.4	60	8.7		14.36		154	
157.48	62	9		14.6		159	
162.56	64	9.36		14.9		164	
167.64	66	9.7		15.2		169	
172.72	68	9.92		15.5		174	
177.8	70	10.2		15.8		179	
182.88	72	10.6		16.2		185	
187.96	74	11.2		16.7		195	

I ran out of table Space, if I can find a 500cm roon I will try it again 
I hope this helps someone.