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Hi chaps, I've just received one of these 6 band VHF filters today. It physically bolts onto the TA970H VHF RF amp and also the MA989/E frame. What I need to know is whether it can handle the TX power

On this link you can find my notes related to the RA.1217, if you are interested. Had someone the same problem with the coil cores? www.k100.biz/ebooks/RA1217.pdf (

Good Morning to All, thanks for your letters. I continued my work: now I have two receivers which both at least comply with the overall requirement at 3.5 MHz. But I am giving up. All the problems I

Hi Friends, thanks for answering. I have three receivers from a friend. I would like to restore at least one (for him) and possibly one for me. * Receiver #1: someone recapped its PSU and rewired

Ian Ropper has worked on these radios, along with many other items from Racal. Go to his website: chavfreezone.me.uk You will find that he last restored one in 2010, and he discusses his experiences

Hi Friends, I am new (only here, unfortunately I am all but new...) I am trying to restore initially at least one of three RA.1217 I have here. They are probably the most difficult equipment I worked

Hi guys: Not a technical guy, however the 6790GM here is not improved by the addition of the Sherwood SE-3. That says something I do use it anyways however, because the audio out is strong enough

Hi Graham, There is a guy in Germany selling Plessey SL621C's for about 28 Euro. Is that the one you are referring to? Cheers, Peter - VK2AN

Hi everyone, I have a question for the technical guru's. When I tune in AM stations using SAM on my WJ8711, its quite obvious that is generating and reinserting its own carrier. There is a momentary

Hi Peter That looks to be,? I checked again to day, using spec-lab and am carrier, there is a profile attached to the agc recovery, when the? carrier is removed, using the rx off tune noise, its in

I can write Arduino code. Might be an interesting project... However, I am always a bit loathe to do too many mods to what is a classic receiver after all. Mine definitely engages hang AGC in medium

Yes just checked ..hang only engages in long The agc is a little clunky compared to the 1778 ..but that radio was profiled for operator use Theres opportunity to provide external agc generation

Hi Pete It was a option fit on the 1771 and 1772 as well..that fit was analog...fun to set up too .... Who else worked in the annext at western road back then ? You can do the same with sdr sharp

Unfortunately my 1779 wasn't fitted with the AFC lock option, however I often use SSB on the appropriate sideband to listen to difficult AM stations such as Radio Pyongyang (for a bit of

I saw a post about the hex files for the 6790 with LF and 1-10-100kc tuning but cannot find it now for some reason, I would like to find those files. Thanks W5DTW -- This email has been checked

RA1778 Tricks of the Trade - VMARS AM net resolved as SSB - using AFC carrier phase lock, full carrier AGC and selectable USB/LSB side band - eliminating co-channel QRM. Not quite its intended use,

Change all the? 1uF tants in the AGC and meter D/A cts round the? diversity cct's the old ones now have voltage/leak problems , which clamps the agc pk voltage and makes the? meter read low, as

For anyone who is interested, I thought I would do a quick write up of how to change the AGC time constants on the RA6790/GM There are two separate stages that control AGC on this receiver, a "hang"

I'll send it to you directly. 73- Dan