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- HI-FI ESSB Audio | TA7OM - Amateur Radio
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- WB Audio Section: K6JRF 10/7/2008
Several months ago I noticed that Amazon.com had a number of vendors who were selling Pyle microphones for $9.99 that are clones of the Shure SM57 and SM58. They are sold with the Pyle model designations of PDMIC78 and PDMIC58. Being curious I decided to buy one of each just to see how they performed. When they arrived I was astonished to see that they looked and felt just like the real deal. I have an old beat up SHURE SM-57 and was amazed that the cheap clone was a very accurate replica as far as weight and looks. In the picture below my Shure SM-57, with it's grill held on by black tape, is on the left with the clone PDMIC78 in the middle and the clone PDMIC58 on the right. The clone mics have XLR connectors at the base and come with a 15 foot unbalanced cord using an XLR female connector and a 1/4 inch phone plug. The microphones looked good on the outside but the wiring inside was very poor. The wires were flimsy and so poorly tack soldered to the mic element and the XLR connector that the leads broke off when I opened up each mic. I removed the cheap wiring from both microphones and twisted two leads of heavier stranded wire together and soldered one end of the leads to the two solder tabs of the microphone element and the other end of the leads to XLR pins 2 and 3. I ran a jumper from XLR pin 1 to the ground lug of the XLR connector and then put the microphones back together.
I also scrapped the mic cable that came in the box because it was a single conductor inside a cheap spiral shield which is terrible for RF isolation. I made a balanced cable for each microphone with an XLR connector on one end and a Kenwood style 8 pin MIC connector on the other end. The wire soldered to pin 2 of the XLR was connected to pin 1 of the Kenwood connector and the wire soldered to pin 3 at the XLR end was connected to pin 7 of the Kenwood connector. I tied the shield to the XLR connector's pin 1 and to pin 8 of the Kenwood connector and that made the TS-590S happy with both microphones. Note that if you run into RF feedback with the microphones wired this way you can open up the XLR end of the mic cable and put a jumper between pin 3 and pin 1 to ground one side of the element to the shield at the microphone end of the cable. This is the best way to use a balanced microphone with equipment using an unbalanced microphone input like the 590S.
While monitoring my 590S with another rig I made the EQ profile shown in the image below that worked well with both of the clone microphones. You can judge for yourself how the microphones sound by listening to the video below as my 590S was being received by my ANAN SDR while using a 3 kHz receive filter. The MIC level of my 590S was set to '50' with the processor levels set to PRO-I = 35 and PRO-O = 70. These settings resulted in the ALC flickering up to about 5 hash marks.
The TS-590S using the Pyle $9.95 PDMIC 58 clone microphone from Amazon.com
It's important to note that both of these microphones need to be used with a windscreen to avoid popping on the 'plosive p' sounds as you speak. Amazon sells a foam windscreen for $1.99 that slips right over the PDMIC58 microphone and it also sells the original equipment Shure A2WS BLK windscreen for $14.99 that fits the PDM78 microphone perfectly. After playing around with both microphones I decided that they sounded identical and stations at the other end reported that they could hear no difference between them. They also reported that there seemed to be very little difference when I switched to the real Shure SM-57 or several other dynamic studio microphones that I own. If anything, the reports were that the clone microphones seemed a little bit brighter than the other dynamics that I switched to. This makes sense since the frequency response chart that comes with the clone mics shows a 6 dB rise between 900 cps and 3000 cps which is a huge bonus when the microphones are used for SSB.
At this time I have not found anything that I prefer over these microphones when I run the TS-590S. They sound smooth, clean, and natural and I think they look great. The price is right too!
HI-FI ESSB Audio | TA7OM - Amateur Radio
I now understand that all mics are different and have different frequency responses and vocal characteristics. The mic has to be tailored to get enhance it's characteristics and then set up for your voice. You can see the EQ settings further down the page.
EQ settings as helped by 2E0KAX & M0VDO
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The above file is an audio recording on the 18th July 2020 with good propagation - i’m using a bandwidth of 100-3500KHz, and received signal strength around 20db over. So very clear to the recieving station.
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