{"id":35707,"date":"2019-01-25T07:53:09","date_gmt":"2019-01-25T11:53:09","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=35707"},"modified":"2019-01-25T07:53:09","modified_gmt":"2019-01-25T11:53:09","slug":"inside-the-hanrongda-hdr-737-wide-frequency-receiver","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2019\/01\/inside-the-hanrongda-hdr-737-wide-frequency-receiver\/","title":{"rendered":"Inside the HanRongDa HDR-737 wide frequency receiver"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Many thanks to SWLing Post<\/em> contributor, Nad, who writes:<\/p>\n

I bought an HRD-737 a few weeks ago off AliExpress. Was going to write a review but now feel there is no point because it has so many major and minor problems beyond those already reported.<\/p>\n

Decided to take mine apart. The photo is attached.<\/p><\/blockquote>\n

\"\"<\/a>

Click to enlarge.<\/p><\/div>\n

It appears to me that the HRD-737 could be the first attempt at an SDR-based pocket sized receiver. Wondering if you or someone the experts at SWLing Post can offer any insight in this regard. Identifying marks on the ICs have been removed. The metal can in the middle could be a wideband programable oscillator of some kind?<\/p><\/blockquote>\n

Thank you for sharing, Nad!<\/p>\n

Readers: can you shed some light on the HDR-737 receiver design based on this internal photo?\u00a0 Please comment!<\/p>\n","protected":false},"excerpt":{"rendered":"

Many thanks to SWLing Post contributor, Nad, who writes: I bought an HRD-737 a few weeks ago off AliExpress. Was going to write a review but now feel there is no point because it has so many major and minor problems beyond those already reported. Decided to take mine apart. The photo is attached. It […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[836,3,26,43],"tags":[7571,7535,4082],"class_list":["post-35707","post","type-post","status-publish","format-standard","hentry","category-new-products","category-news","category-radios","category-shortwave-radio","tag-hanrongda-hdr-737","tag-hdr-737","tag-shortwave-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-9hV","jetpack-related-posts":[{"id":35586,"url":"https:\/\/swling.com\/blog\/2019\/01\/any-reviews-of-the-hanrongda-hrd-737-portable-radio\/","url_meta":{"origin":35707,"position":0},"title":"Any reviews of the HanRongDa HRD-737 portable radio?","author":"Thomas","date":"January 14, 2019","format":false,"excerpt":"Many thanks to SWLing Post contributor,\u00a0Jamie Anderson (KM4WYO), who writes: I have been browsing around eBay too much and was trying to put together a do-it-all radio for camping\/backpacking that is small. It is hard to find SW\/broadcast\/weather\/air band together (for good reason, of course). I did run across this\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":38754,"url":"https:\/\/swling.com\/blog\/2019\/07\/imres-hanrongda-hrd-737-modification-increases-sensitivity\/","url_meta":{"origin":35707,"position":1},"title":"Imre’s HanRongDa HRD-737 modification increases sensitivity","author":"Thomas","date":"July 29, 2019","format":false,"excerpt":"Many thanks to SWLing Post contributor, Imre Olajos, who writes: Hi, HRD 737 lovers! I have a good news! I\u00a0 (became brave enough to) modify my HRD-737. I tried reverse-engineering- but I gave up. No numbers on IC-s. I found specifications for the analog switches (one for each band )\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/HanRongda-1024x584.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/HanRongda-1024x584.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/HanRongda-1024x584.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":56205,"url":"https:\/\/swling.com\/blog\/2023\/03\/the-hanrongda-hrd-a320-paul-seeks-feedback-about-this-new-portable-radio\/","url_meta":{"origin":35707,"position":2},"title":"The HanRongDa HRD-A320: Paul seeks feedback about this new portable radio.","author":"Thomas","date":"March 28, 2023","format":false,"excerpt":"Many thanks to SWling Post contributor, Paul Jamet, who writes: Hi Thomas, After the HRD-737 : https:\/\/swling.com\/blog\/2019\/01\/inside-the-hanrongda-hdr-737-wide-frequency-receiver\/ and the HRD-747 : https:\/\/swling.com\/blog\/2022\/03\/paul-is-impressed-with-the-hanrongda-hrd-747\/ here is the HanRongDa HRD-A320 Does anyone have any information about this new receiver released by HanRongDa? https:\/\/www.aliexpress.com\/item\/1005005320277700.html With the WB band, this receiver seems intended mainly for\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/03\/HanRongDa-HRD-A320-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/03\/HanRongDa-HRD-A320-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/03\/HanRongDa-HRD-A320-1.jpeg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":35602,"url":"https:\/\/swling.com\/blog\/2019\/01\/critical-reviews-of-the-37-hanrongda-hrd-737-shortwave-radio\/","url_meta":{"origin":35707,"position":3},"title":"Critical reviews of the $37 HanRongDa HRD-737 shortwave radio","author":"Thomas","date":"January 21, 2019","format":false,"excerpt":"Many thanks to SWLing Post contributors Glen and James Fields who shared their experience after \u00a0publishing a post about the HannRongDa HRD-737 portable radio. Glen writes: I received one Saturday I had ordered from Aliexpress. In one word, avoid. The performance is really terrible everywhere except the FM broadcast band.\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/01\/HanRongDa-HRD-707-e1547468548172.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":52227,"url":"https:\/\/swling.com\/blog\/2022\/03\/hanrongda-hrd-747-expanding-reception-to-include-longwave\/","url_meta":{"origin":35707,"position":4},"title":"HanRongDa HRD-747: Expanding reception to include longwave","author":"Thomas","date":"March 20, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dan Robinson, who shares the following video which shows how connecting an external antenna to the HDR-747 extends reception range down to longwave: https:\/\/www.youtube.com\/watch?v=HguQU4trbSo Click here to view on YouTube. Thanks for the tip, Dan! Note: Dennis adds that the antenna used in this\u2026","rel":"","context":"In "How To"","block_context":{"text":"How To","link":"https:\/\/swling.com\/blog\/category\/how-to\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/02\/HRD-747-Mei-Tao-5.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/02\/HRD-747-Mei-Tao-5.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/02\/HRD-747-Mei-Tao-5.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/02\/HRD-747-Mei-Tao-5.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":52295,"url":"https:\/\/swling.com\/blog\/2022\/03\/paul-is-impressed-with-the-hanrongda-hrd-747\/","url_meta":{"origin":35707,"position":5},"title":"Paul is impressed with the HanRongDa HRD-747","author":"Thomas","date":"March 28, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor, Paul Jamet, who writes: Hello Thomas, I have just received the HRD-747 I ordered a fortnight ago. Of course, I quickly made some tests and I'd like to share two of them with you and the regulars of the SWLing Post: 1 - This\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/03\/HDR-747-1-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/03\/HDR-747-1-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/03\/HDR-747-1-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/03\/HDR-747-1-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/03\/HDR-747-1-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/35707","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=35707"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/35707\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=35707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=35707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=35707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}