Hi Kent, I assume you are interfacing an ALE radio to a VHF+ repeater system for LQA based ALE inlink voice follow on, please comment. If so I would be interested in knowing your approach to handling the inlink state timing during the Voice follow on with the Remote ALE user, I would assume a periodic data burst will be used unless you are just going to max out the timers?
Regarding your query, SNR and BER interpretation depends on the make/model ALE modem/controller quantification of the 0..30 range for each as the SNR is often interpreted differently. Some ALE controllers look at 30 as the best SNR and some look at 0 as the best SNR and then what channel has the lowest BER for the best channel LQA ranking. Thus to figure out what your controller does just look at the LQA channel ranking and the SNR and BER readings, if the top ranked channel has both low BER and low SNR then 0 for each is the best, otherwise if will be 0 for BER and 30 for SNR. However this is still just the LQA rating, it does not necessarilly mean that the RF S-meter reading is full scale or even stronger for the best LQA ranked channel from a particular station intercepted vs. for that statons LQA ranking on another channel. /s/ Steve, N2CKH ----- Original Message ----- From: Kent Chong Date: Wednesday, February 27, 2008 3:56 am Subject: [Repeater-Builder] HF ALE LQA Values To: [email protected] > Good day. > > Does anybody know about the relationship between the HF ALE LQA > value and received signal strength? We could extract the LQA > values from the HF radio, but we do not know how to convert it > back to the received signal strength. > > Appreciate your advices. > > Best Regards, > > Chong Kwan Meng >
