I decided to purchase a PLJ-8LED freq counter last month to see if I could get it to work with my R4-C
Even though it was $10 higher in cost, I went with Amazon because of their simple return policy and the unit being a Chinese product.
The first unit was DOA.
The second one worked, but only with my sig gen set to max output. It turns out that some of these units come with an incorrectly color-coded connector for the signal input - the red wire goes to gnd and the black wire is the signal input. After resolving this problem, the unit worked good with my R4., except for 10M. There is a spur 5.645 MHz above the injection signal. If this spur is within 10 dB of the injection signal, the freq display is unstable. This was not an issue on 80-15 M, but on 10 M the spur was only 8 dB down. By realigning the 10 M band I was able to get the spur 15 dB down and subsequently got stable readings.
Yesterday the unit died. It displayed all zeros on both high and low channels regardless of freq or pwr level. Went to the Amazon site to try and return it, but discovered that it was 10 days past the 30 day return period. Decided to order another unit from Amazon. When I got to check out, I noticed that there were several unusual entries - no option for shipping method, no charge for shipping when there should have been, and a credit of $1.90 applied for a ¡°promotion¡±. After searching through all of the fine print I discovered that by placing the order I was agreeing to their promotion, which was to be signed up for Prime for 3 months. Amazon slipped this in even though I had previously checked the box saying I didn¡¯t want Prime. I was unable to find a way to order the part without agreeing to the promotion.
